Auditable coin mixing service method and system model based on blind signature

Abstract

The invention belongs to the technical field of blockchain privacy protection, and particularly relates to an auditable coin mixing service method and system model based on a blind signature, and themethod comprises that: a currency mixing server and a user generate secret key pairs respectively before currency mixing service is started, public keys are disclosed, and private keys are stored; a coin mixing service is started; the coin mixing server responds; blinding is performed; and blind signature, blind resolution and coin mixing services are completed. The system model comprises a coin mixing server, a user and an audit block chain. According to the auditable coin mixing service method based on the blind signature, the link between the input address and the output address can be cutoff, the purpose of privacy protection is achieved, and the expenditure of calculation and storage is effectively reduced through the strong blind signature algorithm based on the elliptic curve. Besides, the scheme also has good security characteristics, including anonymity, DOS attack prevention and theft attack prevention, and realizes safe and auditable blind mixed currency service through aneconomic punishment mechanism and an auditing block chain.

Description

technical field [0001] The invention belongs to the technical field of blockchain privacy protection, in particular to an auditable currency mixing service method and system model based on blind signatures. Background technique [0002] As a public ledger system, the blockchain is collected and recorded in detail, and any participant can query the information on the chain, so it faces a serious risk of privacy leakage. In order to protect user privacy, the blockchain provides a certain degree of pseudonymity. Users can locally generate random addresses that have nothing to do with identity information through a series of cryptographic transformations. Such random addresses (or pseudonyms) are usually used as account numbers for transaction input and output. Although compared with traditional accounts, they have better anonymity, they can only provide limited privacy protection. By tracking and analyzing blockchain transactions, attackers can trace the relationship between a...

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