Method and system for merchant cryptocurrency acceptance via payment rails

Abstract

A method for accepting blockchain payments at a conventional point of sale device via issuer processing includes receiving an authorization request for a fiat payment transaction originating from the point of sale device and routed through a payment network, identifying the acceptance of the blockchain payment for a transaction account associated with a transaction account number, receiving a destination address of an electronic wallet associated with the blockchain network, transmitting the new blockchain transaction to a blockchain node in the blockchain network, receiving a transaction identifier from the blockchain node, and transmitting an authorization response for the fiat currency payment transaction to the payment network for routing to the point of sale device.

Description

[Technical Field]

[0001] This disclosure relates to accepting blockchain payments at traditional point-of-sale devices. Specifically, this disclosure relates to enabling fiat transactions to be settled via blockchain transactions through the use of issuer processing of blockchain transactions while using traditional payment rails and points-of-sale devices. [Background technology]

[0002] Blockchain was originally created as a storage mechanism for use in conducting payment transactions using cryptocurrencies. Using blockchain offers many advantages, including decentralization, distributed computation, transparency regarding transactions, and providing anonymity regarding individuals or entities involved in transactions. As a result, many consumers may be interested in using blockchain as a payment method for transactions. However, traditionally, merchants were required to provide new point-of-sale devices that interface with a computing device suitable for accepting blockchain payments via the merchant's own blockchain wallet. This high barrier to entry resulted in a minimal number of merchants enabling the acceptance of blockchain payments.

[0003] Therefore, there is a need for a technology system that can enable consumers to use blockchain for transaction settlement while still utilizing traditional point-of-sale systems. Summary of the Invention

[0004] This disclosure provides a description of a system and method for accepting blockchain payments at a traditional point of sale via issuer processing. A fiat payment transaction can proceed as usual: a consumer presents a payment card that is swiped at the traditional point of sale, and an authorization request is submitted via a payment rail. When the authorization request arrives at the issuer, the issuer can identify that payment via blockchain is possible and initiate a blockchain transaction for the equivalent settlement of the cryptocurrency transaction. The transaction is completed at the point of sale via traditional methods, while the cryptocurrency transaction settles with the issuer for the appropriate transaction amount. This can be settled with the acquirer and merchant using standard processing. As a result, payment is made by the consumer via the issuer via cryptocurrency, while the merchant and acquirer participate in the transaction and receive traditional fiat payments using standard equipment and systems. Thus, consumers can settle fiat transactions using cryptocurrency while utilizing the merchant's traditional point of sale devices and systems. This enables any merchant to accept cryptocurrency payments without any modifications to their existing systems.

[0005] A method for accepting blockchain payments at a conventional point of sale device via issuer processing includes receiving, by a receiver of a processing server, an authorization request for a fiat currency payment transaction originating from a point of sale device and routed through a payment network, the authorization request including at least a transaction account number and a transaction amount; identifying, by a processor of the processing server, an acceptance of a blockchain payment for a transaction account associated with the transaction account number; receiving, by the receiver of the processing server, a destination address of an electronic wallet associated with a blockchain network; and transmitting, by a transmitter of the processing server, a destination address of an electronic wallet associated with the blockchain network. sending a new blockchain transaction to a blockchain node in a network, the new blockchain transaction including at least the destination address, a cryptocurrency amount based on the transaction amount, a digital signature, and one or more unspent transaction outputs; receiving a transaction identifier from the blockchain node by the receiver of the processing server; and sending an authorization response of the fiat currency payment transaction by the transmitter of the processing server to the payment network for routing to the point of sale device, the authorization response including an indication of authorization of the fiat currency payment transaction and the transaction identifier.

[0006] A system for accepting blockchain payments at a conventional point of sale device via issuer processing includes a payment network, a blockchain network consisting of a plurality of blockchain nodes, a point of sale device, and a processing server, the processing server including a receiver for receiving an authorization request for a fiat currency payment transaction originating from the point of sale device and routed through the payment network, the authorization request including at least a transaction account number and a transaction amount, a processor for identifying acceptance of the blockchain payment for a transaction account associated with the transaction account number, and a transmitter, the receiver receiving a blockchain payment from an electronic transaction account associated with the blockchain network. The transmitter further receives a destination address of a child wallet, and the transmitter sends a new blockchain transaction to one of the plurality of blockchain nodes in the blockchain network, the new blockchain transaction including at least the destination address, a cryptocurrency amount based on the transaction amount, a digital signature, and one or more unspent transaction outputs, the receiver receives a transaction identifier from the one of the plurality of blockchain nodes, and the transmitter sends an authorization response for the fiat currency payment transaction to the payment network for routing to the point of sale device, the authorization response including an indication of authorization for the fiat currency payment transaction and the transaction identifier.

[0007] The scope of the present disclosure is best understood from the following detailed description of exemplary embodiments when read in conjunction with the accompanying drawings, in which: [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a block diagram illustrating a high-level system architecture for accepting blockchain payments at a traditional point of sale device, according to an example embodiment. [Figure 2]FIG. 2 is a block diagram illustrating a processing server of the system of FIG. 1 for accepting blockchain payments, according to an exemplary embodiment. [Figure 3A] FIG. 2 is a flow diagram illustrating a process for accepting blockchain payments at a conventional point of sale device in the system of FIG. 1 , according to an exemplary embodiment. [Figure 3B] FIG. 2 is a flow diagram illustrating a process for accepting blockchain payments at a conventional point of sale device in the system of FIG. 1 , according to an exemplary embodiment. [Figure 4] 1 is a flowchart illustrating an exemplary method for accepting blockchain payments at a traditional point of sale device, according to an exemplary embodiment. [Figure 5] FIG. 1 is a block diagram illustrating a computer system architecture, according to an exemplary embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Further areas of applicability of the present disclosure will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description of exemplary embodiments is intended for purposes of illustration only and is therefore not intended to necessarily limit the scope of the present disclosure.

[0010] Glossary Blockchain—A public ledger of all transactions of a blockchain-based currency. One or more computing devices can include a blockchain network. The blockchain network can be configured to process and record transactions as part of blocks in the blockchain. As blocks are completed, they are added to the blockchain, and transaction records are updated accordingly. In many cases, the blockchain can be a chronological ledger of transactions or can be presented in any other order that may be suitable for use by the blockchain network. In some configurations, transactions recorded in the blockchain can include a destination address and a currency amount; for example, the blockchain records how much currency is attributable to a particular address. In some cases, some transactions are financial and others are not, or transactions can include additional or different information, such as a source address, a timestamp, etc. In some embodiments, the blockchain can also or alternatively include nearly any type of data in the form of transactions that are or need to be placed in a distributed database that maintains a continuously growing list of data records hardened against tampering and modification, even by its operators. A blockchain can be verified and validated by a blockchain network through proof of work and / or any other suitable verification techniques associated therewith. In some cases, data about a given transaction can further include additional data not directly part of the transaction that is appended to the transaction data. In some cases, the inclusion of such data in the blockchain can constitute a transaction. In such cases, the blockchain may not be directly associated with a particular digital, virtual, fiat, or other type of currency.

[0011] Payment Network—A system or network used for the transfer of money through the use of cash substitutes for thousands, millions, or even billions of transactions during a given period. A payment network can use a variety of different protocols and procedures to process the transfer of money for various types of transactions. Transactions that may be performed through a payment network can include product or service purchases, credit purchases, debit transactions, fund transfers, direct debits, etc. A payment network can be configured to perform transactions through cash substitutes, which can include payment cards, letters of credit, checks, transaction accounts, etc. Examples of networks or systems configured to perform as payment networks include those operated by Mastercard®, VISA®, Discover®, American Express®, PayPal®, etc. Use of the term “payment network” herein can refer both to a payment network as an entity and to a physical payment network, such as the equipment, hardware, and software that comprises the payment network.

[0012] Transaction Account—A financial account that can be used to fund a transaction, such as a checking account, savings account, credit account, virtual payment account, etc. A transaction account can be associated with a consumer, which can be any suitable type of entity associated with the payment account. The entity can include an individual, a family, a company, a corporation, a government entity, etc. In some instances, a transaction account can be virtual, such as an account operated by PayPal® or the like.

[0013] Payment card—a card or data associated with a transaction account that may be provided to a merchant to fund a financial transaction via the associated transaction account. Payment cards may include credit cards, debit cards, charge cards, stored value cards, prepaid cards, fleet cards, virtual payment numbers, virtual card numbers, controlled payment numbers, etc. A payment card may be a physical card that may be provided to a merchant, or it may be data representing an associated transaction account (e.g., as stored within a communication device such as a smartphone or computer). For example, in some cases, data including a payment account number may be considered a payment card for processing transactions funded by the associated transaction account. In some cases, a check, if applicable, may be considered a payment card.

[0014] Merchant—An entity that offers products (e.g., goods and / or services) for purchase by another entity, such as a consumer or another merchant. A merchant can be a consumer, a retailer, a wholesaler, a manufacturer, or any other type of entity that may offer products for purchase, as would be apparent to one skilled in the art. In some cases, a merchant may have special knowledge in the goods and / or services offered for purchase. In other cases, a merchant may not have or require any special knowledge in the products offered. In some embodiments, entities involved in a single transaction can be considered a merchant. In some cases, as used herein, the term “merchant” can refer to the merchant entity's equipment or devices.

[0015] Issuer—An entity that establishes (e.g., opens) a letter of credit or line of credit for a beneficiary and accepts drafts drawn by the beneficiary for the amount specified in the letter of credit or line of credit. In many cases, an issuer can be a bank or other financial institution authorized to open lines of credit. In some cases, any entity that can extend a line of credit to a beneficiary can be considered an issuer. A line of credit opened by an issuer may be expressed in the form of a payment account and may be drawn upon by the beneficiary through use of a payment card. Issuers may also offer consumers additional types of payment accounts, such as debit accounts, prepaid accounts, e-wallet accounts, savings accounts, checking accounts, etc., as would be apparent to one skilled in the art, and may provide consumers with physical or non-physical means to access and / or utilize such accounts, such as debit cards, prepaid cards, cash machine cards, e-wallets, checks, etc.

[0016] Acquirer - An entity that can process payment card transactions on behalf of a merchant. An acquirer can be a bank or other financial institution authorized to process payment card transactions on behalf of a merchant. In many cases, an acquirer can open a line of credit in favor of the merchant. The acquirer can exchange funds with the issuer when a consumer (who may be the beneficiary of a line of credit provided by an issuer) transacts via a payment card with a merchant represented by the acquirer.

[0017] Payment transaction—a transaction between two entities in which money or other monetary benefit is exchanged from one entity to another. A payment transaction may be a transfer of funds for the purchase of goods or services, for the repayment of a debt, or for any other exchange of monetary benefit as would be apparent to one skilled in the art. In some instances, a payment transaction may refer to a transaction funded via a payment card and / or payment account, such as a credit card transaction. Such payment transactions may be processed through an issuer, a payment network, and an acquirer. The processing for processing such payment transactions may include at least one of authorization, batching, clearing, settlement, and funding. Authorization may include the consumer providing payment details to a merchant, submission of transaction details (e.g., including payment details) from the merchant to an acquirer, and verification of the payment details with the issuer of the consumer's payment account used to fund the transaction. Batching may refer to storing authorized transactions in a batch with other authorized transactions for distribution to an acquirer. Clearing may include transmission of batched transactions from the acquirer to a payment network for processing. Settlement may include debiting an issuer by a payment network for a transaction involving a beneficiary of the issuer. In some cases, the issuer may pay an acquirer via a payment network. In other cases, the issuer may pay an acquirer directly. Funding may include payment from an acquirer to a merchant for a cleared and settled payment transaction. The order and / or categorization of the above steps performed as part of payment transaction processing will be apparent to those skilled in the art.

[0018] A system for blockchain payments at traditional point-of-sale FIG. 1 shows a system 100 that uses blockchain for the settlement of fiat payment transactions conducted using traditional point-of-sale devices and transaction messaging that utilize card-based payment networks.

[0019] The system 100 may include an issuer processing server 102, which is also referred to herein as the “processing server” 102. The issuer processing server 102, which is discussed in more detail below, may be configured to facilitate the use of cryptographic currency, also referred to herein as “cryptocurrency,” for settlement of fiat payment transactions submitted through a payment rail via blockchain transactions. In the system 100, an issuer financial institution associated with the issuer processing server 102 may issue a transaction account to the consumer 104. The transaction account may be a fiat transaction account. The fiat transaction account may be used to fund standard (e.g., for fiat currency) electronic payment transactions through the use of a payment card 106 issued to the consumer 104, which is encoded with payment details for the associated transaction account. The consumer 104 may present the payment card 106 to a point of sale device 108 and fund the fiat payment transaction via the associated transaction account using conventional transaction processing.

[0020] In a traditional fiat payment transaction, the point of sale device 108 reads payment details from the payment card 106 using any suitable method. The payment details may include at least the transaction account number of the associated transaction account. Additional payment details may include, for example, a name, an expiration date, a security code, an application password, etc. The point of sale device 108 may provide the payment details and additional transaction data for the payment transaction to the acquirer processing server 110. The acquirer processing server 110 may be operated with or associated with an acquiring financial institution. The acquiring financial institution, for example, issues a transaction account to the merchant of the point of sale device 108 for use in receiving funds as part of the fiat payment transaction. The acquirer processing server 110 may generate an authorization request for the fiat payment transaction. This authorization request is a type of transaction message, which is a specially formatted data message formatted for transmission via the payment rail and processing via the payment network 112. The authorization request or transaction message can be formatted according to one or more standards governing the exchange of financial transaction messages, such as the International Organization for Standardization's ISO 8583 or ISO 20022 standards. The authorization request can be a type of transaction message, designated by the message type indicator contained therein. The authorization request can include multiple data elements storing data as set forth in the applicable standard, including, for example, a transaction account number, other payment details, a transaction amount, a currency code, a transaction time, a transaction date, a merchant identifier, a point of sale identifier, product data, offer data, rewards data, loyalty data, etc.

[0021] The authorization request can be submitted to the payment network 112 for processing via its associated payment rail. In some cases, the authorization request can be routed via the payment rail through a gateway processor or other intermediate entity between the acquirer processing server 110 and the payment network 112. The payment network 112 can perform any value-added services with respect to the authorization request, such as account mapping, fraud scoring, etc. The payment network 112 can route the authorization request to the issuer processing server 102 via the payment rail. The issuer processing server 102 can be identified using a transaction account number. For example, the transaction account number can include an issuer identification number therein, which can be used by the payment network 112 to identify the issuer processing server 102 and route the authorization request to it.

[0022] In a traditional fiat payment transaction, the issuer processing server 102 identifies the transaction account used by the consumer 104 based on the transaction account number, authorizes or denies the fiat payment transaction using traditional methods, and returns an approval response to the payment network 112 via the payment rail. In the system 100, the issuer processing server 102 can identify the transaction account using the transaction account number and identify that the transaction account is eligible for settlement of fiat payment transactions over the blockchain using its associated cryptocurrency. In the system 100, the consumer 104 can register the transaction account for receiving blockchain payments with the issuer processing server 102 using any suitable method, such as during or after the issuance of the transaction account, via a banking application program, a web page associated with the issuer processing server 102, etc. As part of registering a transaction account, the consumer 104 may provide the issuer processing server 102 with a blockchain wallet for use in cryptocurrency payments, as described in more detail below, or may authorize the issuer processing server 102 to use its blockchain wallet for cryptocurrency payments, which may be settled in the consumer's transaction account via a fiat or cryptocurrency balance.

[0023] In some cases, once the issuer processing server 102 determines that the consumer 104 has registered to receive blockchain payments, the issuer processing server 102 can request authorization for blockchain payments from the consumer 104, such as via a computing device associated with the consumer 104. For example, a short message service message can be sent to the consumer's 104's computing device. The consumer 104 can respond with approval or denial of settlement of the fiat currency payment transaction over cryptocurrency. In other cases, the consumer 104 can provide authorization for blockchain payments, such as through an electronic banking application program on the computing device, before initiating a payment transaction with the point of sale device 108.

[0024] To facilitate settlement via cryptocurrency, the issuer processing server 102 must identify cryptocurrency exchanges willing to accept cryptocurrency payments in exchange for settlement via fiat currency. In some embodiments, the issuer processing server 102 may contact an exchange server 114 directly associated with a cryptocurrency exchange. In other embodiments, a third-party service may be configured to identify suitable cryptocurrency exchanges for the issuer processing server 102, such as may be provided by the settlement network 112. In such embodiments, the settlement network 112 (e.g., or another third party) may be contacted by the issuer processing server 102 and may contact one or more exchange servers 114 to receive therefrom an exchange rate and a blockchain address. The exchange rate may be a currency exchange rate between the fiat currency used in the fiat currency settlement transaction and the cryptocurrency used by the exchange server 114. The blockchain address may be a destination address for a blockchain transaction using the blockchain used for the transaction of the cryptocurrency used by the exchange server 114. The settlement network 112 may then provide the exchange rate and blockchain address data to the issuer processing server 102. If information for more than one exchange server 114 is provided to the issuer processing server 102, the issuer processing server 102 can select the exchange server 114 to use (e.g., based on the best exchange rate for the consumer 104). If the issuer processing server 102 does not use a third-party service, the issuer processing server 102 can query the exchange server 114 directly for the exchange rate and blockchain address.

[0025] Once the issuer processing server 102 identifies an exchange server 114 that transacts in the cryptocurrency, the issuer processing server 102 can submit the new blockchain transaction to a blockchain network 116 that manages the cryptocurrency on which the blockchain transaction is executed. The blockchain network 116 can be comprised of multiple blockchain nodes. Each blockchain node can be a computing system, such as that shown in FIG. 5 and discussed in more detail below, configured to perform functions related to blockchain processing and management, including generating blockchain data values, validating proposed blockchain transactions, verifying digital signatures, generating new blocks, validating new blocks, and maintaining copies of the blockchain. In some embodiments, the settlement network 112 can operate one or more nodes of the blockchain network 116. In some cases, the exchange server 114 can be a blockchain node in the associated blockchain network 116.

[0026] A blockchain may be a distributed ledger composed of at least multiple blocks. Each block may include at least a block header and one or more data values. Each block header may include at least a timestamp, a block reference value, and a data reference value. The timestamp may be the time the block header was generated and may be represented using any appropriate method (e.g., a UNIX timestamp, a date and time, etc.). The block reference value may be a value that references an earlier block in the blockchain (e.g., based on a timestamp). In one embodiment, the block reference value in a block header may be a reference to the block header of the block most recently added before the respective block. In an exemplary embodiment, the block reference value may be a hash value generated by hashing the block header of the most recently added block. The data reference value may similarly be a reference to one or more data values stored in the block containing the block header. In an exemplary embodiment, the data reference value may be a hash value generated by hashing one or more data values. For example, the block reference value may be the root of a Merkle tree generated using one or more data values.

[0027] The use of a block reference value and a data reference value in each block header can result in the blockchain being immutable. Any attempt to change any data value would require the generation of a new data reference value for that block, which would require the block reference value for subsequent blocks to be newly generated, and would further require the generation of a new block reference value for each subsequent block. This would have to be performed and updated at every single node in the blockchain network 116 before the creation and addition of a new block to the blockchain in order for the change to be permanent. Computational and communication limitations make such modifications very difficult, if not impossible, thus allowing the blockchain to be immutable.

[0028] In one embodiment, a blockchain can be used to store information about blockchain transactions between two different blockchain wallets. A blockchain wallet can contain a private key of a cryptographic key pair. The private key of the cryptographic key pair is used to generate a digital signature that serves as a payer's authorization of the blockchain transaction. The digital signature can be verified by the blockchain network 116 using the public key of the cryptographic key pair. In some cases, the term "blockchain wallet" can refer specifically to a private key. In other cases, the term "blockchain wallet" can refer to a computing device (e.g., the issuer processing server 102 and the exchange server 114) that stores private keys for use in blockchain transactions. For example, each computing device can have its own private key for each of the cryptographic key pairs and can each be a blockchain wallet for use in transactions with a blockchain associated with the blockchain network. The computing device can be any type of device suitable for storing and utilizing a blockchain wallet, such as a desktop computer, laptop computer, notebook computer, tablet computer, mobile phone, smartphone, smartwatch, smart TV, wearable computing device, embedded computing device, etc.

[0029] Each blockchain data value stored on the blockchain can correspond to a blockchain transaction or other storage of data, if applicable. A blockchain transaction can consist of at least the digital signature of the sender of the currency (e.g., issuer processing server 102) generated using the sender's private key, the blockchain address of the recipient of the currency (e.g., exchange server 114) generated using the recipient's public key, and the amount of blockchain currency to be transferred or other stored data. In some blockchain transactions, the transaction can also include one or more blockchain addresses of the sender where the blockchain currency is currently stored (e.g., a digital signature certifying access to such currency) and an address held by the sender, generated using the sender's public key for any changes. Addresses to which cryptocurrency is sent that can be used in future transactions are called "output" addresses, which are addresses previously used to capture the output of previous blockchain transactions and are also called "unspent transactions." This is because there may be currency sent to addresses in previous transactions where that currency remains unspent. In some cases, blockchain transactions can also include the sender's public key for use by entities in validating the transaction.

[0030] For traditional processing of blockchain transactions, such data can be provided by either the sender or receiver to a blockchain node within the blockchain network 104. The node can verify the digital signature using the public key in the sender's wallet's cryptographic key pair, verify the sender's access to the funds (e.g., that the unspent transaction has not yet been spent and was sent to an address associated with the sender's wallet), a process known as "confirming" the transaction, and then include the blockchain transaction in a new block. The new block, in a traditional blockchain implementation, can be verified by other nodes within the blockchain network 116 before being added to the blockchain and distributed to all of the blockchain nodes within the blockchain network 116. If the blockchain data value is not associated with a blockchain transaction but may instead be associated with the storage of other types of data, the blockchain data value can still include or involve verification of the digital signature.

[0031] In the system 100, the issuer processing server 102 can submit a blockchain transaction to a node in the blockchain network 116 for settlement of an appropriate amount of cryptocurrency (e.g., based on the transaction amount in the fiat currency settlement transaction and an exchange rate provided by the exchange server 114) from the consumer's transaction account or a blockchain wallet associated with the issuer processing server 102, generally for settlement to a blockchain wallet at the exchange server 114. The blockchain transaction can include the cryptocurrency amount, a blockchain address for receipt by the exchange server 114, one or more unspent transaction outputs, and a digital signature generated using the private key of the blockchain wallet to which the settlement is being made. In an exemplary embodiment, the private key and unspent transaction outputs can be stored in the account profile of the consumer's transaction account, identified, for example, using the transaction account number included in the authorization request routed to the issuer processing server 102 via a payment rail. The node in the blockchain network 116 can receive the blockchain transaction and process it using conventional methods. This traditional method is by confirming the transaction, having it verified by other nodes in the blockchain network 116, and then including it in a new block that is added to the blockchain, etc. As part of processing the blockchain transaction, the node may identify a transaction identifier. The transaction identifier is a unique value for the blockchain transaction and may be sent back to the issuer processing server 102 as confirmation of the blockchain transaction. In one embodiment, the issuer processing server 102 may wait for the blockchain transaction to be presented to the blockchain and identify the transaction identifier therefrom.

[0032] After successful processing of the blockchain transaction, the issuer processing server 102 may provide notification of the successful cryptocurrency settlement to the exchange server 114, such as by providing a transaction identifier to the exchange server 114. In embodiments in which a third-party service is utilized, the third-party service (e.g., the payment network 112) may provide notification to the exchange server 114, e.g., on behalf of the issuer processing server 102. Upon successful processing of the cryptocurrency settlement to the exchange server 114, the issuer processing server 102 may return a fiat settlement transaction authorization response to the payment network 112 indicating that the fiat settlement transaction has been authorized. The authorization response may be a transaction message that includes a message type identifier indicating the authorization response, where the data elements stored therein may include a data element that stores a response code indicating authorization of the fiat settlement transaction. In some cases, a transaction identifier for the blockchain transaction may be included in the authorization response. In such cases, the transaction identifier may be stored in a data element reserved in an applicable standard for private use, such as data element 123 in ISO 8583. The payment network 112 can receive an approval response from the issuer processing server 102 via the payment rail and can send the approval response back to the acquirer processing server 102 using the payment rail.

[0033] The acquirer processing server 110 may receive the authorization response and provide (e.g., as the authorization response or separately) notification to the point of sale device 108 that the fiat payment transaction has been authorized. The merchant may then provide the transacted goods or services to the consumer 104.

[0034] Following completion of processing of the fiat payment transaction, the exchange server 114 can execute a settlement with the issuer processing server 102. The settlement can include providing the issuer processing server 102 with the fiat transaction amount. The fiat transaction amount is based on the cryptocurrency payment made to the exchange server 114 using an exchange rate provided by the exchange server 114. If the cryptocurrency payment is made directly from the consumer's 104 blockchain wallet, the consumer's account can accurately reflect the transaction as a result of the cryptocurrency payment. If the issuer processing server 102 uses the issuer processing server's 102 blockchain wallet, the issuer processing server 102 can debit the consumer's fiat transaction account for the appropriate fiat transaction amount. The issuer financial institution can also provide the fiat payment to the acquiring financial institution as part of a traditional settlement between financial institutions. The acquiring financial institution can then credit the merchant's transaction account accordingly.

[0035] As a result, payments can be made for fiat payment transactions via cryptocurrency, while the point of sale device 108 and acquirer processing server 110 perform standard processing for fiat payment transactions using standard equipment and systems. Thus, payments can be made using cryptocurrency on traditional point of sale devices 108 and through traditional acquirer processing servers 110 using payment rails of the payment network 112. The consumer 104 is free to use a payment card 106 issued on a fiat transaction account for cryptocurrency payments. Furthermore, the consumer 104 can do so at all merchants, regardless of direct blockchain acceptance by the merchant, because the merchant and acquirer accept payment for the transaction via fiat. Thus, the methods and systems discussed herein solve the problems of merchants and acquirers accepting payments via cryptocurrency by enabling consumers to pay with cryptocurrency on traditional systems without the need for merchant or acquirer involvement.

[0036] Issuer Processing Server Figure 2 illustrates one embodiment of the issuer processing server 102 in system 100. Those skilled in the art will appreciate that the embodiment of the issuer processing server 102 illustrated in Figure 2 is provided by way of example only and may not encompass all possible configurations of an issuer processing server 102 suitable for performing the functions discussed herein. For example, computer system 500 illustrated in Figure 5 and discussed in more detail below may be a suitable configuration of the issuer processing server 102. In some cases, the payment network 112, exchange server 114, blockchain network 116, and acquirer processing server 110 may include components as illustrated in Figure 2 and be configured to perform the functions discussed herein.

[0037] The issuer processing server 102 may include a receiving device 202. The receiving device 202 may be configured to receive data over one or more networks via one or more network protocols. In some instances, the receiving device 202 may be configured to receive data from the payment network 112, the exchange server 114, the blockchain network 116, and other systems and entities via one or more communication methods, such as radio frequency, a local area network, a wireless area network, a cellular network, Bluetooth, the Internet, etc. In some embodiments, the receiving device 202 may comprise multiple devices, such as different receiving devices for receiving data over different networks, e.g., a first receiving device for receiving data over a local area network and a second receiving device for receiving data over the Internet. The receiving device 202 may receive an electronically transmitted data signal. This data may be superimposed or encoded on the data signal and may be decoded, parsed, read, or otherwise obtained via reception of the data signal by the receiving device 202. In some instances, the receiving device 202 may include a parsing module that parses the received data signal to obtain data overlaid thereon. For example, the receiving device 202 may include a parser program that is configured to receive and convert the received data signal into usable input for functions performed by the processing device to implement the methods and systems described herein.

[0038] The receiving device 202 can be configured to receive data signals transmitted electronically by the payment network 112. The data signals can be transmitted via a payment rail and overlaid or encoded with transaction messages, such as a request for authorization of a fiat currency payment transaction, or data related to a cryptocurrency transaction, such as an exchange rate and a destination blockchain address. The receiving device 202 can also be configured to receive data signals transmitted electronically by the exchange server 114. The data signals can be overlaid or encoded with exchange rate and address information. The receiving device 202 can further be configured to receive data signals transmitted electronically by the blockchain network 116, e.g., via a blockchain node included therein. The data signals can be overlaid or encoded with a transaction identifier or other data related to the processing of the blockchain transaction.

[0039] The issuer processing server 102 may also include a communications module 204. The communications module 204 may be configured to transmit data between modules, engines, databases, storage, and other components of the issuer processing server 102 for use in performing the functions discussed herein. The communications module 204 may be comprised of one or more communication types and may utilize various communication methods for communication within a computing device. For example, the communications module 204 may be comprised of a bus, contact pin connectors, electrical wires, etc. In some embodiments, the communications module 204 may also be configured to communicate between internal components of the issuer processing server 102 and components external to the issuer processing server 102, such as externally connected databases, display devices, input devices, etc. The issuer processing server 102 may also include a processing unit. The processing unit may be configured to perform the functions of the issuer processing server 102 discussed herein, as would be apparent to one skilled in the art. In some embodiments, the processing device may include and / or consist of multiple engines and / or modules specially configured to perform one or more functions of the processing device, such as query module 214, generation module 216, and transaction processing module 218. As used herein, the term "module" may refer to software or hardware specifically programmed to receive input, perform one or more operations using the input, and provide output. The inputs, outputs, and operations performed by the various modules will be apparent to those skilled in the art based on this disclosure.

[0040] The processing server 102 may include an account database 206. The account database 206 may be configured to store a plurality of account profiles 208 using any suitable data storage format and scheme. The account database 206 may be a relational database. The relational database utilizes a structured query language to store, identify, modify, update, access, etc., the structured data sets stored therein. Each account profile 208 may be a structured data set configured to store data related to a transaction account. An account profile 208 may include, for example, the transaction account number of the associated transaction account, other associated payment details, blockchain wallet data (e.g., private and public keys of a cryptographic key pair, unspent transaction outputs, balance data), and any other data used in processing fiat and cryptocurrency payment transactions, such as balances, credit information, rewards data, etc.

[0041] The issuer processing server 102 may include a query module 214. The query module 214 may be configured to run a query on a database to identify information. The query module 214 may receive one or more data values or query strings and run the query string based thereon on an indicated database, such as the account database 206 of the issuer processing server 102, to identify information stored therein. The query module 214 may then output the identified information to an appropriate engine or module of the issuer processing server 102, as needed. The query module 214 may, for example, run a query on the account database 206 to identify an account profile 208 associated with the fiat payment transaction using the transaction account number included in the received authorization request, and may determine, for example, whether the consumer 104 received the payment via blockchain or whether they received authorization or denial of the fiat payment transaction based on balance and credit information.

[0042] The issuer processing server 102 may also include a generation module 216. The generation module 216 may be configured to generate data for use by the issuer processing server 102 in performing the functions discussed herein. The generation module 216 may receive instructions as input, may generate data based on the instructions, and may output the generated data to one or more modules of the issuer processing server 102. For example, the generation module 216 may be configured to generate new transaction messages, generate digital signatures for new blockchain transactions, generate new blockchain transactions, generate cryptocurrency amounts based on fiat currency transaction amounts and exchange rates, etc.

[0043] The issuer processing server 102 may also include a transaction processing module 218. The transaction processing module 218 may be configured to perform the functions of the issuer processing server 102 related to processing payment transactions, including fiat currency payment transactions and blockchain transactions. The transaction processing module 218 may, for example, determine authorization or denial of a payment transaction based on credit and balance information, etc., determine a fraud score for the payment transaction, determine authorization or denial based on fraud or other factors and criteria, perform account mapping, identify routing information for transaction messages, etc.

[0044] The issuer processing server 102 may also include a transmitting device 220. The transmitting device 220 may be configured to transmit data over one or more networks via one or more network protocols. In some instances, the transmitting device 220 may be configured to transmit data to the payment network 112, the exchange server 114, the blockchain network 116, and other entities via one or more communication methods, such as a local area network, a wireless area network, cellular communication, Bluetooth, radio frequency, the Internet, etc. In some embodiments, the transmitting device 220 may be comprised of multiple devices, such as different transmitting devices for transmitting data over different networks, e.g., a first transmitting device for transmitting data over a local area network and a second transmitting device for transmitting data over the Internet. The transmitting device 220 may electronically transmit a data signal overlaid with data that can be parsed by a receiving computing device. In some instances, the transmitting device 220 may include one or more modules for overlaying, encoding, or formatting data onto a data signal suitable for transmission.

[0045] The sending device 220 can be configured to electronically send a data signal to the payment network 112. This data signal can be overlaid or encoded with a transaction message, such as an authorization response, for a fiat currency payment transaction that may be transmitted using a payment rail associated with the payment network 112. The sending device 220 can also be configured to electronically send a data signal to the payment network 112 and the exchange server 114. This data signal can be overlaid or encoded with a trade request. The trade request can request an exchange rate and blockchain destination data therefrom. The sending device 220 can further be configured to receive a data signal electronically sent by the blockchain network 116, such as from a node. This data signal can be overlaid or encoded with notifications and other data related to blockchain transactions processed thereby.

[0046] The issuer processing server 102 may also include a memory unit 226. The memory unit 226 may be configured to store data for use by the issuer processing server 102 in performing the functions discussed herein, such as public and private keys, symmetric keys, etc. The memory unit 226 may be configured to store data using appropriate data formatting methods and schemes and may be any suitable type of memory, such as read-only memory, random access memory, etc. The memory unit 226 may include, for example, cryptographic keys and algorithms, communication protocols and standards, data formatting standards and protocols, program code for processing unit modules and application programs, and other data that may be suitable for use by the issuer processing server 102 in performing the functions disclosed herein, as would be apparent to one skilled in the art. In one embodiment, the memory unit 226 may consist of or include a relational database. The relational database utilizes a structured query language for storing, identifying, modifying, updating, accessing, etc., structured data sets stored therein. The memory unit 226 can be configured to store, for example, cryptographic keys, salts, nonces, communication information for blockchain nodes and the blockchain network 116, destination generation and verification algorithms, digital signature generation and verification algorithms, cryptocurrency exchange rates, transaction message format standards, payment rail routing data, and the like.

[0047] Processing for accepting blockchain payments 3A and 3B illustrate the operation of the system 100 for blockchain settlement acceptance of fiat currency settlement transactions at a conventional point of sale device 108 through processing by the issuer processing server 102 and use of the exchange server 114.

[0048] At step 302, the payment network 112 may receive an authorization request for a fiat payment transaction from the acquirer processing server 110. It may be routed to the issuer processing server 102 using a payment rail associated with the payment network 112. The authorization request may be a specially formatted transaction message and may include at least the transaction account number, the transaction amount, and any other transaction data used in processing the fiat payment transaction. At step 304, the receiving device 202 of the issuer processing server 102 may receive the authorization request. At step 306, the query module 214 of the issuer processing server 102 may perform a query on the account database 206 of the issuer processing server 102 and use the transaction account number included in the authorization request to identify an account profile 208 associated with the transaction account used in the fiat payment transaction. The account profile 208 may include an indication of receipt of the blockchain payment.

[0049] At step 308, the sending device 220 of the issuer processing server 102 can electronically transmit the trade information request to the exchange server 114 using an appropriate communications network and method. At step 310, the exchange server 114 can receive the trade information request. At step 312, the exchange server 114 can identify an exchange rate for the transaction between the fiat currency and the cryptocurrency utilized by the exchange server 114 and a destination blockchain address, such as may be generated using the public key of the exchange server's blockchain wallet for the blockchain used for the cryptocurrency. At step 314, the exchange server 114 can electronically transmit the exchange rate and blockchain address back to the issuer processing server 102.

[0050] At step 316, the receiving device 202 of the issuer processing server 102 may receive the exchange rate and the blockchain address. At step 318, the generating module 216 of the issuer processing server 102 may generate a new blockchain transaction. The blockchain transaction may include a digital signature generated using the private key of the blockchain wallet where the payment is being made (e.g., of the issuer processing server 102, as stored in storage 226, or of the consumer 104, as stored in the identified account profile 208), the blockchain address received from the exchange server 114, and a cryptocurrency amount based on the transaction amount and exchange rate from the authorization request. At step 320, the sending device 220 of the issuer processing server 102 may electronically transmit the new blockchain transaction to a node in the blockchain network 116 using an appropriate communications network and method.

[0051] At step 322, the receiving device 202 of the issuer processing server 102 may receive a transaction identifier for the blockchain transaction from a node in the blockchain network 116. This may be sent directly therefrom or identified in blockchain data received therefrom (e.g., identified in a new blockchain data value stored in a block added to the blockchain). At step 324, the sending device 220 of the issuer processing server 102 may electronically send an authorization response for the fiat payment transaction (e.g., generated by the generating module 216 or the transaction processing module 218 of the issuer processing server 102) to the payment network 112 using its associated payment rail. The authorization response is formatted using the same standard as the authorization request and may include a response code stored in its data element. This response code indicates authorization of the fiat payment transaction.

[0052] At step 326, the payment network 112 may receive an authorization response from the issuer processing server 102 using the payment rail. At step 328, the payment network 112 may route the authorization response to the point of sale 108 via the acquirer processing server 110 and any other intermediary systems. Based on the notification from the point of sale 108, the merchant may complete the fiat payment transaction with the consumer 104.

[0053] At step 330, the exchange server 114 may identify a blockchain transaction for the settlement of the cryptocurrency amount from the issuer processing server 102 to the exchange server 114. In some cases, the exchange server 114 may identify the blockchain transaction by identifying the use of its blockchain address as the recipient of the blockchain transaction. In other cases, the issuer processing server 102 may provide a transaction identifier to the exchange server 114 for use in identifying the blockchain transaction within the blockchain. At step 332, the exchange server 112 may effect a settlement with the issuer processing server 102 by effecting a fiat settlement to the issuer processing server 102 for an amount based on the cryptocurrency amount and the exchange rate, where the settlement may differ from the transaction amount included in the authorization request. At step 334, the issuer processing server 102 may receive the settlement. At step 336, the issuer processing server 102 may effect its settlement to the acquirer. This may be for the transaction amount included in the authorization request.

[0054] Exemplary Method for Accepting Blockchain Payments at Traditional Point of Sale Devices FIG. 4 illustrates a method 400 for the acceptance of blockchain cryptocurrency as settlement for a fiat payment transaction performed at a conventional point of sale through the use of processing by the issuing financial institution involved in the fiat payment transaction.

[0055] At step 402, an authorization request for a fiat currency payment transaction originating from a point of sale device (e.g., point of sale device 108) and routed through a payment network (e.g., payment network 112) may be received by a receiver (e.g., receiving device 202) of a processing server (e.g., issuer processing server 102). The authorization request includes at least a transaction account number and a transaction amount. At step 404, a receipt of the blockchain payment may be identified by a processor (e.g., query module 214) of the processing server of a transaction account associated with the transaction account number. At step 406, a destination address may be received by a receiver of the processing server of an electronic wallet associated with the blockchain network (e.g., blockchain network 116).

[0056] At step 408, a new blockchain transaction can be sent by a transmitter of the processing server (e.g., transmitter 220) to a blockchain node in the blockchain network. The new blockchain transaction includes at least a destination address, a cryptocurrency amount based on the transaction amount, a digital signature, and one or more unspent transaction outputs. At step 410, a transaction identifier can be received from the blockchain node by a receiver of the processing server. At step 412, an authorization response for the fiat payment transaction can be sent by the transmitter of the processing server to the payment network for routing to the point of sale device. The authorization response includes an indication of authorization for the fiat payment transaction and the transaction identifier.

[0057] In one embodiment, method 400 may further include transmitting, by a transmitter of the processing server, the routing message to the exchange server. The destination address is received from the exchange server in response to the routing message. In a further embodiment, the routing message may be formatted according to one or more standards used in formatting authorization requests and authorization responses. In another further embodiment, the response to the routing message may further include an exchange rate. The cryptocurrency amount may be based on the exchange rate and the transaction amount.

[0058] Also, in one embodiment, method 400 may include identifying, by a processor of the processing server, a private key of the cryptographic key pair, and generating, by the processor of the processing server, a digital signature using the private key. In one embodiment, the authorization response may be formatted according to a standard governing the exchange of financial transaction messages. In a further embodiment, the standard may be ISO 8583. In another further embodiment, the transaction identifier may be stored in a data element reserved for private use, as specified in the standard.

[0059] Computer System Architecture 5 illustrates a computer system 500 in which embodiments of the present disclosure, or portions thereof, may be implemented as computer-readable code. For example, the issuer processing server 102, acquirer processing server 110, settlement network 112, exchange server 114, and blockchain network 116 of FIG. 1 may be implemented in computer system 500 using hardware, non-transitory computer-readable media having stored instructions, or a combination thereof, and may be implemented in one or more computer systems or other processing systems. The hardware may embody the modules and components used to implement the methods of FIGS. 3A, 3B, and 4.

[0060] Where programmable logic is used, such logic may execute on commercially available processing platforms configured with executable software code to become special-purpose computers or special-purpose devices (e.g., programmable logic arrays, application-specific integrated circuits, etc.). Those skilled in the art will appreciate that embodiments of the disclosed subject matter may be practiced using a variety of computer system configurations, including multi-core multiprocessor systems, minicomputers, mainframe computers, computers linked or clustered with distributed functionality, and general-purpose or small computers that may be embedded in virtually any device. For example, at least one processor unit and memory unit may be used to implement the above-described embodiments.

[0061] A processor unit or device discussed herein may be a single processor, multiple processors, or a combination thereof. A processor device may have one or more processor "cores." The terms "computer program medium," "non-transitory computer-readable medium," and "computer-usable medium" discussed herein are generally used to refer to tangible media, such as removable storage unit 518, removable storage unit 522, and a hard disk installed in hard disk drive 512.

[0062] Various embodiments of the present disclosure are described with respect to this exemplary computer system 500. After reading this description, it will become apparent to one skilled in the art how to implement the present disclosure using other computer systems and / or computer architectures. While operations may be described as sequential processes, some of the operations may in fact be performed in parallel, concurrently, and / or in a distributed environment, using program code stored locally or remotely for access by single or multi-processor machines. Additionally, in some embodiments, the order of operations may be rearranged without departing from the spirit of the disclosed subject matter.

[0063] The processor unit 504 may be a special-purpose or general-purpose processor unit specifically configured to perform the functions discussed herein. The processor unit 504 may be connected to a communications infrastructure 506, such as a bus, a message queue, a network, a multi-core message passing scheme, or the like. The network may be any network suitable for performing the functions disclosed herein. The network may include a local area network (LAN), a wide area network (WAN), a wireless network (e.g., WiFi), a cellular network, a satellite network, the Internet, fiber optics, coaxial cable, infrared, radio frequency (RF), or any combination thereof. Other suitable network types and configurations will be apparent to those skilled in the art. The computer system 500 may also include a primary memory unit 508 (e.g., random access memory, read-only memory, etc.) and a secondary memory unit 510. The secondary memory unit 510 may include a hard disk drive 512 and a removable storage drive 514, such as a floppy disk drive, a magnetic tape drive, an optical disk drive, or a flash memory.

[0064] The removable storage drive 514 can read from and / or write to the removable storage unit 518 in well-known fashion. The removable storage unit 518 can include a removable storage medium that can be read from and written to by the removable storage drive 514. For example, if the removable storage drive 514 is a floppy disk drive or a Universal Serial Bus port, the removable storage unit 518 can be a floppy disk or a portable flash drive, respectively. In one embodiment, the removable storage unit 518 can be a non-transitory computer-readable recording medium.

[0065] In some embodiments, secondary storage 510 may include alternative means for allowing computer programs or other instructions to be loaded into computer system 500, such as a removable storage unit 522 and interface 520. Examples of such means may include a program cartridge and cartridge interface (e.g., as found in video game systems), a removable memory chip (e.g., EEPROM, PROM, etc.) and associated socket, and other removable storage units 522 and interfaces 520 as would be apparent to one skilled in the art.

[0066] Data stored in computer system 500 (e.g., in primary memory 508 and / or secondary memory 510) may be stored on any type of suitable computer-readable medium, such as an optical storage device (e.g., a compact disc, a digital versatile disc, a Blu-ray disc, etc.) or a magnetic tape storage device (e.g., a hard disk drive). The data may be organized in any type of suitable database structure, such as a relational database, a structured query language (SQL) database, a distributed database, an object database, etc. Suitable structures and storage types will be apparent to those skilled in the art.

[0067] Computer system 500 may also include a communications interface 524. Communications interface 524 may be configured to allow software and data to be transferred between computer system 500 and external devices. Exemplary communications interface 524 may include a modem, a network interface (e.g., an Ethernet card), a communications port, a PCMCIA slot and card, etc. The software and data transferred via communications interface 524 may be in the form of electronic, electromagnetic, optical, or other signals as would be apparent to one skilled in the art. The signals may be conveyed over communications path 526, which may be configured to carry signals and may be implemented using wire, cable, fiber optics, a telephone line, a cellular phone link, a radio frequency link, etc.

[0068] Computer system 500 may further include a display interface 502. Display interface 502 may be configured to allow data to be transferred between computer system 500 and an external display device 530. Exemplary display interfaces 502 may include a High-Definition Multimedia Interface (HDMI), a Digital Visual Interface (DVI), a Video Graphics Array (VGA), etc. Display device 530 may be any suitable type of display device for displaying data transmitted via display interface 502 of computer system 500, including a cathode ray tube (CRT) display, a liquid crystal display (LCD), a light-emitting diode (LED) display, an electrostatic touch display, a thin-film transistor (TFT) display, etc.

[0069] The computer program medium and computer-usable medium may refer to memory, such as the main memory 508 and the secondary memory 510, which may be memory semiconductors (e.g., DRAM, etc.). These computer program products may be means for providing software to the computer system 500. Computer programs (e.g., computer control logic) may be stored in the main memory 508 and / or the secondary memory 510. The computer programs may also be received via the communication interface 524. When such computer programs are executed, they may enable the computer system 500 to perform the methods discussed herein. In particular, when the computer programs are executed, they may enable the processor unit 504 to perform the methods illustrated by FIGS. 3A, 3B, and 4, as discussed herein. Thus, such computer programs may represent a control unit of the computer system 500. When the present disclosure is implemented using software, the software may be stored in a computer program product and loaded into the computer system 500 using the removable storage drive 514, the interface 520, the hard disk drive 512, or the communication interface 524.

[0070] The processor unit 504 may include one or more modules or engines configured to perform the functions of the computer system 500. Each of the modules or engines may be implemented using hardware. In some examples, each of the modules or engines may utilize software, such as program code and / or corresponding programs, stored in the main memory 508 or the secondary memory 510. In such cases, the program code may be compiled by the processor unit 504 (e.g., by a compiling module or engine) before execution by the hardware of the computer system 500. For example, the program code may be source code written in a programming language that is translated into a lower-level language, such as assembly language or machine code, for execution by the processor unit 504 and / or any additional hardware components of the computer system 500. The compiling process may include the use of lexical analysis, preprocessing, syntactic analysis, semantic analysis, syntax-directed translation, code generation, code optimization, or any other technique that may be suitable for translating program code into a lower-level language suitable for controlling the computer system 500 to perform the functions disclosed herein. Those skilled in the art will appreciate that the result of such processing is a specially configured computer system 500 that is uniquely programmed to perform the functions described above.

[0071] Among other features, technology consistent with the present disclosure provides systems and methods for the acceptance of blockchain payments at traditional point-of-sale devices via issuer processing. While various exemplary embodiments of the disclosed systems and methods have been described above, it should be understood that they have been presented for purposes of illustration only, and not limitation. They are not exhaustive and do not limit the disclosure to the precise form disclosed. Modifications and variations are possible in light of the above teachings, or can be obtained from the practice of the present disclosure without departing from the breadth or scope of the present disclosure.

Claims

1. 1. A method for acceptance of blockchain payments at a traditional point of sale device via an issuer transaction, comprising: receiving, by a receiver of a processing server, an authorization request for a fiat currency payment transaction originating from a point of sale device and routed through a payment network, said authorization request including at least a transaction account number and a transaction amount; identifying, by a processor of the processing server, a receipt of a blockchain payment for the transaction account associated with the transaction account number; receiving, by the receiver of the processing server, a destination address of an electronic wallet associated with a blockchain network; sending, by a transmitter of the processing server, a new blockchain transaction to a blockchain node in the blockchain network, the new blockchain transaction including at least the destination address, a cryptocurrency amount based on the transaction amount, a digital signature, and one or more unspent transaction outputs; receiving, by the receiver of the processing server, a transaction identifier from the blockchain node; transmitting, by the transmitter of the processing server, an authorization response for the fiat currency payment transaction to the payment network for routing to the point of sale device, the authorization response including an indication of authorization of the fiat currency payment transaction and the transaction identifier; Including, transmitting, by the transmitter of the processing server, a routing message to an exchange server; The method, wherein the destination address is received from the exchange server in response to the routing message.

2. 2. The method of claim 1, wherein the routing message is formatted according to one or more standards used in formatting the authorization request and the authorization response.

3. The method according to claim 1 or claim 2, the response to the routing message further includes an exchange rate; The cryptocurrency amount is based on the exchange rate and the transaction amount. method.

4. The method according to any one of claims 1 to 3, identifying, by the processor of the processing server, a private key of an encryption key pair; generating, by the processor of the processing server, the digital signature using the private key; The method further comprises:

5. 5. The method of claim 1, wherein the authorization response is formatted in accordance with a standard governing the exchange of financial transaction messages.

6. The method of claim 5, wherein the standard is ISO 8583.

7. 7. The method of claim 5 or 6, wherein the transaction identifier is stored in a data element reserved for private use as specified in the standard.

8. 1. A system for acceptance of blockchain payments at a traditional point of sale via issuer processing, comprising: Payment networks and A blockchain network consisting of multiple blockchain nodes; a point of sale device; a processing server; The processing server includes: a receiver for receiving an authorization request for a fiat currency payment transaction originating from the point of sale device and routed through the payment network, the authorization request including at least a transaction account number and a transaction amount; a processor that identifies receipt of a blockchain payment for a transaction account associated with the transaction account number; a transmitter; The receiver further receives a destination address of an electronic wallet associated with a blockchain network; the transmitter transmits a new blockchain transaction to one of the plurality of blockchain nodes in the blockchain network; The new blockchain transaction includes at least the destination address, a cryptocurrency amount based on the transaction amount, a digital signature, and one or more unspent transaction outputs; the receiver receives a transaction identifier from the one of the plurality of blockchain nodes; the transmitter transmits an acknowledgement of the fiat payment transaction to the payment network for routing to the point of sale device; the authorization response includes an indication of authorization of the fiat currency payment transaction and the transaction identifier; The transmitter of the processing server sends a routing message to an exchange server; the destination address is received from the exchange server in response to the routing message; system.

9. 9. The system of claim 8, wherein the routing message is formatted according to one or more standards used in formatting the authorization request and the authorization response.

10. 10. The system according to claim 8 or claim 9, the response to the routing message further includes an exchange rate; The cryptocurrency amount is based on the exchange rate and the transaction amount. system.

11. 11. The system according to claim 8, wherein the processor of the processing server: identifying a private key of a cryptographic key pair; generating the digital signature using the private key; To run the system.

12. 12. The system of any one of claims 8 to 11, wherein the acknowledgement response is formatted in accordance with a standard governing the exchange of financial transaction messages.

13. 13. The system of claim 12, wherein the standard is ISO 8583.

14. 14. A system according to claim 12 or claim 13, wherein the transaction identifier is stored in a data element reserved for private use as specified in the standard.

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