Transaction Granularity Modifiable Consortium Blockchain Scheme Based on Dual Merkel Trees Block Structure

With the vigorous development of blockchain technology,information systems based on blockchain have been applied in many fields,including digital currency,supply chain and other fields.Driven by the dual needs of supervision and practical application,modifiable blockchain technology has been developed.However,the current modification scheme still has problems such as excessive centralization of modification authority and low modification efficiency.In response to the aforementioned problems,a transaction-granularity consortium blockchain ledger modification approach is proposed.It constructs a dual Merkle tree block structure,utilizing elliptic curve encryption and Diffie-Hellman key exchange technology to encrypt and store the chameleon hash trapdoor information(i.e.,chameleon hash private key) in the blockchain,reducing the system communication overhead for key distribution.On this basis,the modification right is bound to the user through the Merkle tree,and the proposal is subject to vo-ting review by authorized nodes,which effectively prevents the mining of modification rights and further improves the regulatory warehouse capabilities of the blockchain system.Modification experiments show that the overall algorithm execution speed of this consortium blockchain ledger solution reaches the millisecond level,and significantly reduces the additional overhead of data ope-rations on the chain.