41 results about "Multisignature" patented technology

A blockchain-based system and method for secure and auditable sharing of medical image studies between providers, patients, and authorized recipients. The system has modules for verifying identities of trusted healthcare providers as issuers of medical data, managing secure storage of medical images and metadata, minting non-fungible tokens (NFTs) representing patient ownership of studies, authenticating patient consent for data sharing, and controlling access to shared data by authorized parties. Issuer registration authenticates healthcare providers permitted to submit studies by verifying credentials against authoritative sources. Secure data management employs cryptographic wallets and smart contracts to ensure only verified issuers can create new medical data NFTs on the blockchain. Automated processing extracts medical data such as image files and metadata upon upload for separate secure storage, with metadata references encrypted in the associated NFT. The system generates patient-controlled wallets for managing ownership of their medical NFTs without separate identity verification. Patient consent for sharing data is authenticated through multi-signature wallets requiring patient approval before minting study NFTs. Controlled access for other parties is gated by cryptographic proofs of authorization without exposing data. The immutable blockchain ledger records all sharing transactions initiated through patient and provider wallets, providing transparency and an auditable trail of how and when medical data is shared or accessed and by whom. The decentralized architecture promotes patient control, security, and accountability in managing sensitive healthcare information.

In certain embodiments, multisignature-based network operations are performed. Some embodiments may generate transformed instructions for a network operation and a set of sent messages based on an instruction precursor and obtain a set of signed messages corresponding to a set of sent messages. In connection with cryptographic verification of the set of signed messages, some embodiments cause the execution of the network operation based on the cryptographic verification satisfying a threshold number of valid signatures.

Systems and methods for computer-implemented commodity transactions using blockchain-based smart contracts. A server with memory executes application to authenticate buyer and seller, receive listing with commodity identifier, quantity, quality, delivery terms, price; generate smart contract specifying participant identifiers, wallet or banking info, order and contract IDs, milestone events, settlement terms; commit contract to blockchain; escrow funds associated with contract; obtain shipment, inspection, and delivery status via oracle; verify milestone satisfaction; release escrowed funds accordingly; record settlement on chain; and update database. Modules may include compliance to compute taxes and fees, identity to perform KYC / AML, and dispute resolver to execute predefined remedies. Optional multisignature escrow and fiat or crypto settlement are supported. Executions store hashes and ledger indices to provide tamper evident audit trails.

The invention relates to a block chain on-chain and off-chain linkage query method and system based on a decentralized oracle machine, and the method comprises the steps: obtaining to-be-stored multi-modal data, storing the multi-modal data in an off-chain manner, obtaining a data abstract through abstract calculation, and obtaining a label and a value of the label through information labeling; constructing a time index; storing the time index, the label and the value of the label in a storage contract deployed on a chain; the storage under the chain synchronizes the data abstract and the storage address to an oracle contract deployed on the chain, and the oracle contract is subscribed by a decentralized oracle network; the storage contract responds to the user query and is sent to the oracle contract, and the nodes in the decentralized oracle network generate integrity proof based on the subscribed user query; and the decentralized oracle machine network aggregates the digital signatures of the nodes to obtain multiple signatures reaching a threshold value, and sends the original data, the multiple signatures and the integrity proof corresponding to the user query to the user to realize the block chain up-chain and down-chain linkage query.

The invention discloses a block chain service processing method and device, a medium and a program product. The method relates to the technical field of block chains, and comprises the following steps: generating a service processing request through a service initiator, and sending the service processing request to each signer; the service hash is signed according to the private key through a signer, and a signature result and a public key are sent to the smart contract; wherein each signer generates an independent public and private key pair in advance; through the smart contract, performing signature verification according to the signature result and the public key sent by each signature party, and updating the number of effective signatures according to the signature verification result; and through the smart contract, when it is determined that a predefined service processing condition is satisfied according to the number of effective signatures, triggering service processing logic, and writing a service processing result into the block chain. By adopting the technical scheme, the security of block chain service processing can be improved through a multi-signature mechanism and an intelligent contract technology, and the multi-signature processing efficiency is ensured.

The invention discloses a commodity transaction data security management method and system based on a block chain, and relates to the technical field of commodity transaction data management, and the method comprises the steps: constructing a commodity transaction network based on the block chain, including sellers, buyers and consensus verification and supervision nodes, and guaranteeing the security of transaction data through employing distributed storage. A unique identifier is generated when the commodity information is linked, and the unique identifier is stored through a hash function and a digital signature. Transaction is driven by an intelligent contract, and consensus calculation is carried out by adopting right and interest proof, workload proof or entrusting right and interest proof. Orders are classified and stored, multiple signatures verify transactions, and funds are managed by an intelligent contract and released according to a transaction state. Commodity traceability adopts a time integral model to calculate a circulation process, and meanwhile, a privacy protection mechanism is utilized to ensure information security of two transaction parties. The method has better effects in the aspects of security, privacy and tamper-proofing capability.

A request to perform an action related to a smart contract deployed on a blockchain may be received at a database system. The smart contract may be associated with a multi-signature authorization policy including one or more signature criteria for performing the action. A respective signature request message may be transmitted to a plurality of recipients. The signature request messages may identify the smart contract and the action. A plurality of signature response messages may be received. Two or more of the signature response messages may include a respective signature generated based on a respective private cryptographic key. An action execution message may be transmitted to execute the smart contract to perform the action. The action execution message may include the two or more signatures. The smart contract may be configured to perform the action when the two or more signatures comply with the multi-signature authorization policy.

The invention discloses a safe and efficient lattice-based multi-signature method, which introduces an ownership proving mechanism for verifying that a signer holds a legal key pair, and effectively prevents a malicious signer from controlling an aggregation public key to generate a forged signature by forging a public key. And signature participants are organized by adopting a homomorphic commitment mechanism and a tree structure, so that the interaction turns and the communication data volume required in the signature process can be effectively reduced. The tree structure localizes communication between participants, so that the overall bandwidth consumption can be reduced, the aggregation efficiency is improved, and good adaptability and expandability are shown in a large-scale distributed system. Compared with a traditional lattice-based multi-signature scheme, the method has the advantages that through structure optimization and process simplification, the communication data volume and the computing resource consumption can be remarkably reduced while the security is maintained, so that the scheme has higher feasibility and efficiency advantages in practical application.

Techniques are presented for a blockchain-implemented method and system of controlling use of or access to a parking space. The method comprises generating a blockchain transaction indicative of a condition on use of, or access to, the parking space, the blockchain transaction comprising a multi-signature script requiring a plurality of signatures for completion of the blockchain transaction; providing a first subset of the plurality of signatures to the blockchain transaction to generate a partially signed signature script to partially complete the blockchain transaction; and responsive to the condition on use of or access to the parking space being satisfied, providing a second subset of the plurality of signatures to the blockchain transaction to fully complete the blockchain transaction.

The invention discloses a light client communication method, system and device based on a consensus committee, and a storage medium, belongs to the technical field of block chains, and solves the technical problem that an existing light client protocol still has obvious limitations in the aspects of storage and communication overhead, security and consensus mechanism compatibility. The invention discloses a light client protocol compatible with various consensus mechanisms and having universality and security, the protocol designs a consensus committee dynamic election mechanism without a trusted third party based on chain quality attributes, and provides a concise and efficient proof generation normal form in combination with weighted multiple signatures. On the premise of not depending on a centralized relay, a light client protocol keeps communication and storage complexity lower than a sub-linear level, and security threats such as Eclipse attacks and the like are effectively defended.

The invention relates to a cross-fragmentation block chain transaction control method. The method comprises the steps of performing initial logic fragmentation based on multi-dimensional performance indexes and historical behavior data of nodes; behavior characteristic data generated by the nodes in the actual transaction process are collected, and node reputation values are calculated and updated through a sliding window weighted average and time decay model; each logic fragment operates as an independent consensus unit, and an improved PBFT consensus protocol is adopted to perform transaction sorting and block generation; if the transaction relates to cross-fragmentation, screening high-reputation nodes, executing three-layer authentication of subjective, objective and recommendation trust, and using a BLS multi-signature verification path; and after the transaction is completed, synchronizing the state of each fragment, executing excitation or punishment on the node according to the transaction participation condition, and updating the reputation value of the node. According to the method and the device, dynamic screening, multilayer verification and excitation control of the cross-fragment transaction nodes can be realized, so that the system expansibility is improved, and the security and the adaptive capability are enhanced at the same time.

The present disclosure generally relates to methods, systems, apparatuses, and non-transitory computer readable media for managing cryptocurrency. A cryptocurrency management system has a cryptocurrency management device (CMD), a mobile communication device (MCD), and a cryptocurrency management server (CMS) that are each configured to store a respective private key for use in generating a respective authenticating signature for a multi-signature address of a cryptocurrency network. Any two of the three authenticating signatures capable of being generated by the CMD, MCD, and CMS may be combined to generate a fully authenticated request for transferring cryptocurrency associated with the multi-signature address. The system provides the user with a flexible self-custody solution that permits him or her to transfer cryptocurrency without having to access the private key stored at the CMS. However, the CMS enables for recovery in the event of loss or unavailability of one or both of the CMD and / or the MCD.

A blockchain system has an identity-based blockchain account including a primary chain, a secondary chain, and at least one key book applying to the account, the at least one key book having a key page. The system includes: a hardware processor; and a memory device storing instructions. When the instructions are executed by the processor, they cause the processor to: record a multi-signature transaction originating from the account in the secondary chain; associate the transaction with the key page of the at least one key book, the key page including (i) a signature-authorization rule, and (ii) a plurality of keys corresponding to a plurality of transaction authorizers; record, in the secondary chain, an authorization of the transaction from a transaction authorizer of the plurality of transaction authorizers; and once a number of authorizations recorded on the secondary chain satisfies the signature-authorization rule, record the transaction on the primary chain for execution.

The invention relates to a method comprising a quantum-resistant lattice-based accountable subgroup multi-signature scheme.

The invention discloses a traceable multi-signature method supporting a distributed aggregator and lightweight setting, which is characterized in that a decentralized signature generation mechanism is realized by adopting a cryptographic method comprising bilinear pairing, a linear homomorphic time lock, a cryptographic hash function and a BLS signature; the method specifically comprises the steps of system initialization, key generation, authorization generation and aggregation, prompt generation, partial signature and verification, authorization verification, signature aggregation, authorization revocation, signature verification and the like. Compared with the prior art, the method has a decentralized key generation mechanism, a distributed aggregator mechanism and a signature accountability function, so that high communication overhead caused by the use of a distributed key generation protocol and a single-point fault possibly caused by excessive dependence on a single aggregator are avoided; and meanwhile, a strong association mechanism between the signer and the final multiple signatures is established, and the signer is responsible for the signature behavior of the signer, so that the problems of low efficiency and high centralization of aggregators caused by dependence on a DKG protocol are effectively solved.

The application relates to a multi-signature method, a multi-signature verification method and a device of a blockchain platform. The multi-signature method of the application acquires a signature address corresponding to a multi-signature transaction, thereby determining signature data of the multi-signature transaction, and then encrypts user signature data in the signature data by using a locally pre-stored private key to cover the user signature data, thereby realizing an encryption process of the multi-signature. After the encryption is completed, a signature user list, an updated signed user list and a signature threshold are used to perform an operation of a blockchain chaining process, thereby broadcasting the updated signature data to the blockchain. The application can effectively apply a multi-signature scheme to the blockchain.

The application belongs to the technical field of blockchains, and particularly relates to a resource allocation method, a resource allocation device, a computer readable medium and an electronic device. The resource allocation method comprises the following steps: sending a contract template for agreeing on a resource allocation rule to a transaction platform node in a blockchain network, so that the transaction platform node performs content filling and signature processing on the contract template to obtain a single-party signed smart contract carrying a digital signature of the transaction platform node; sending the single-party signed smart contract to a transaction subject node in the blockchain network, so that the transaction subject node performs content checking and signature processing on the single-party signed smart contract to obtain a multi-signature smart contract carrying a digital signature of the transaction platform and a digital signature of the transaction subject; performing signature checking on the multi-signature smart contract, and allocating resources to the transaction platform node and the transaction subject node according to the multi-signature smart contract that passes the checking. The method can improve the reliability and credibility of network transactions.

This application relates to the field of data security technology, specifically to a method and system for verifying the anti-counterfeiting of digital property rights certificates. The method includes: generating a digital property rights certificate based on user-submitted property rights information; constructing multiple sub-tasks for multiple contents requiring digital signatures and sending them to different participants; determining the signing order of participants performing parallel multi-signatures according to their historical signing times to generate an initial multi-signature; setting a key update mechanism to regenerate a new multi-signature; and randomly verifying the generated multi-signature multiple times to verify the validity of the digital property rights certificate. This application aims to improve the efficiency and reliability of anti-counterfeiting verification of digital property rights certificates.

A computer implemented method for generating a multisignature transaction for a blockchain comprising: receiving a first output and a non-signature portion of a first input, the first input comprising an outpoint to a first spendable transaction output encoding a multisignature requirement; electronically signing the first output and the non-signature portion of the first input, thereby generating a signature for satisfying the multisignature requirement when included with: (i) an associated sighash single flag, and (ii) at least one other signature; receiving a second output and a non-signature portion of a second input, the second input comprising an outpoint to a second spendable transaction output encoding a signature requirement requiring at least one signature; and electronically signing the second output and the non-signature portion of the second input, thereby generating a signature for at least partially satisfying the signature requirement when included in a signature portion with an associated sighash single flag.

Systems and methods for authorizing a blockchain transaction. A verification network receives a transaction request for the blockchain transaction from a payer device including a first signature generated by a first private key associated with a payer. The verification network broadcasts a verification request to verification system(s) which assess pre-agreed threshold parameters. If the parameter(s) are satisfied, at least one verification system perfects the transaction by generating a second signature using a second private key, and broadcasts the transaction to the blockchain network. If the parameter(s) are not satisfied, verification offer(s) from among the verification system(s) including the second signature(s) are used to prompt the payer device to confirm the blockchain transaction by selecting at least one of the offer(s). The verification network receives selected offer(s) from the payer device and broadcasts the transaction to the blockchain network, in accordance with the selected offer(s) and the transaction request.

Methods and systems for enabling conditional access to a resource, where the condition is the performance of a task. This task can be executed by one party on behalf of another. The entity controlling access creates a task that includes broadcasting a transaction on the blockchain, with multiple outputs, including a locking-output. Additional transactions ensure access to the resource only upon task completion. Access is achieved by initially broadcasting the resource, conditionally available, then broadcasting the transaction that fulfills the condition. Multi-signatures and a refund mechanism are used to lock access, with multi-signatures spread across transactions. Initial deposit broadcast makes the resource available but locked by a first multi-signature and tied to a refund mechanism. The task and transaction have a locking-output secured by a second multi-signature linked to the refund mechanism. Access requires both multi-signatures of the refund mechanism to be signed and the main transaction to be broadcast.

The application relates to the field of blockchain security, in particular to a data storage method for blockchain broadcast multi-signature based on quantum attack resistance, which comprises the following steps: constructing a multi-signature system; a signature organizer node constructs an intelligent contract and initiates data signature; the signature organizer uploads to-be-signed data, a signer node and an aggregated public key of all signature nodes to a blockchain; the to-be-signed information is unevenly divided according to the credit weight of the signer node, and the divided data is distributed to corresponding signer nodes for signature according to the node performance and the credit weight; the signer node returns the signed data to the intelligent contract, the intelligent contract verifies the returned information, and if the verification is successful, the signature result is stored, otherwise, the signature fails; the application can perform more secure multi-to-multi transaction signature, prevent quantum computers from reverse cracking the signature result, and guarantee the security and availability of the blockchain system.

Systems and methods for authorizing a blockchain transaction. A verification network receives a transaction request for the blockchain transaction from a payer device including a first signature generated by a first private key associated with a payer. The verification network broadcasts a verification request to verification system(s) which assess pre-agreed threshold parameters. If the parameter(s) are satisfied, at least one verification system perfects the transaction by generating a second signature using a second private key, and broadcasts the transaction to the blockchain network. If the parameter(s) are not satisfied, verification offer(s) from among the verification system(s) including the second signature(s) are used to prompt the payer device to confirm the blockchain transaction by selecting at least one of the offer(s). The verification network receives selected offer(s) from the payer device and broadcasts the transaction to the blockchain network, in accordance with the selected offer(s) and the transaction request.

Systems and procedures for quantifying, tracking, and settling differentiated energy attribute (DEA) tokens using a private blockchain network across the entire lifecycle of differentiated energy products derived from raw materials and synthesized products. Differentiated energy attributes are verified by a verification authority according to issuance standards as primary and derivative differentiated energy attribute tokens (DEATs) associated with differentiated energy from raw materials or a synthesized product. DEATs are published on a modified multi-signature wallet of the differentiated energy producer or synthesized product producer, governed by the terms and conditions of one or more smart contracts.DEATs can be settled in a bilateral transaction between a buyer and a seller via a transaction smart contract.

The present application discloses a digital signature method, system, electronic device, storage medium and program product. It is applied to a signature device, including: receiving a signature strategy and a transaction message sent by a terminal device, wherein the signature strategy includes a signature private key list and a signature algorithm list; after detecting a confirmation instruction, traversing each private key in the signature private key list, and signing the transaction message according to the current traversal private key and the algorithm identifier corresponding to the current traversal private key included in the signature algorithm list to generate a digital signature; the confirmation instruction indicates the user's instruction to confirm the transaction message; the digital signature generated by each traversal is sent to the terminal device to achieve multi-signature protection. Since the present application generates multiple signatures after the user confirms once in a transaction signature process, it is suitable for the hybrid signature mechanism in post-quantum cryptography migration, which can improve user experience and signature performance.

The invention provides a blockchain-based platform for secure management and sharing of research data. It integrates modules for smart contract execution, decentralized data marketplaces, dynamic consent management, cross-chain interoperability, and advanced security features, including post-quantum cryptography and multi-signature authentication. The platform ensures data integrity, transparency, and compliance with evolving privacy regulations by automating research agreements, incentivizing participation through tokenomics, and enabling seamless multi-party collaborations. A decentralized reputation scoring system and comprehensive version control enhance accountability and traceability of research activities. Additionally, the platform supports data anonymization and dynamic consent updates, safeguarding participant privacy while fostering collaborative research. By leveraging AI-driven analysis and decentralized governance through a DAO model, the invention optimizes research processes, facilitates efficient data exchange, and promotes ethical standards in research environments, offering a robust and innovative solution to the challenges of modern research data management.

The application discloses a cross-domain federated learning method based on a block chain, which uses a multi-signature technology to solve the effectiveness detection of a training model of each node in a federated learning process, uses two signature nodes 1 and 2 used for signature to respectively complete a learning digital signature and an expected digital signature. The signature node 2 is used for the learning digital signature of the node completing the training model, and the learning digital signature indicates that the node has completed learning. When the node completing the training model outputs a model, the output training model of the node is compared with an expected training model range, if the expected training model range is met, the signature node 2 performs the expected digital signature on the node, and the expected digital signature indicates that the output training model of the node meets the expected training model range; if the expected training model range is not met, the expected digital signature is not performed on the node.

The present disclosure generally relates to methods, systems, apparatuses, and non-transitory computer readable media for managing cryptocurrency. A cryptocurrency management system has a cryptocurrency management device (CMD), a mobile communication device (MCD), and a cryptocurrency management server (CMS) that are each configured to store a respective private key for use in generating a respective authenticating signature for a multi-signature address of a cryptocurrency network. Any two of the three authenticating signatures capable of being generated by the CMD, MCD, and CMS may be combined to generate a fully authenticated request for transferring cryptocurrency associated with the multi-signature address. The system provides the user with a flexible self-custody solution that permits him or her to transfer cryptocurrency without having to access the private key stored at the CMS. However, the CMS enables for recovery in the event of loss or unavailability of one or both of the CMD and / or the MCD.

The application discloses a kind of group-oriented multi-signature method, system, electronic device and storage medium, method includes: initialization θ group Gr i ; Private key is generated for each group member and administrator, and the public key of group is calculated and published;When signing, each group selects a member to participate in signature, whether the signature of this member is established is verified, if not established, stop this signature;If established, administrator sends R i , administrator public key mpk i To smart contract;After R i , administrator public key mpk i , smart contract is received, (R1, mpk1), …, (R θ , mpk θ ) are sent to each group administrator, and current time stamp t is recorded, T is calculated and sent to each group administrator;According to the signature public key of all group administrators, v i =H1 (L, mpk i ), L is mpk1, …, mpk θ List is constructed, and s i Is calculated;Group administrator sends the s i Calculated to smart contract;After receiving all s1, …, s θ , smart contract sends s1, …, s θ To each group administrator;The administrator of group Gr i Calculates s=s1+…+s θ (mod α), (s, p i，j , R' i，j , s' i，j ) is saved, and the final signature σ=(R, s) is output.

The invention discloses a transaction detection rule updating method and device and a computer storage medium, and relates to the field of block chains. The method comprises the steps that under the condition that it is detected that an oracle machine obtains an updating instruction about a transaction detection rule, or under the condition that it is detected that a block chain node corresponding to a supervision mechanism initiates a multi-signature proposal, rule updating information is generated, the oracle machine is used for connecting external data with the block chain node, and the block chain node is used for connecting the external data with the block chain node; the multi-signature proposal is a modification proposal about the transaction detection rule; calling an intelligent contract deployed in a block chain, the transaction detection rule being built in the intelligent contract; and updating the transaction detection rule built in the smart contract according to the generated rule updating information. The technical problems of compliance risk and low system efficiency caused by untimely rule updating and lack of flexibility in execution in a traditional transaction detection system are solved.