A linkable Ring Signature Electronic Cash Scheme Based on Blockchain

Aiming at the problem of repetitive spending in the current blockchain e-cash transactions, a linkable ring signature scheme is proposed for blockchain. Based on the linkability of the signature, it can judge whether two signatures are generated by the same signer, which solves the double blossom problem in the e-cash transaction and ensures the anonymity of the transaction. In order to solve the problem of too long signature length in ring signature, the aggregate signature technology is introduced to generate short signature with fixed length. After security analysis, the scheme has anonymity and unforgeability, and can resist the at-tack of double blossom. Compared with the equivalent scheme, this scheme has lower storage cost and higher processing efficiency.