关键词: 区块链, 默克尔树, 智能合约, 哈希锁, 公证人机制, 跨链交互

Abstract: In recent years, blockchain technology has been continuously developed, but with the development, problems have also emerged. For example, the problem of privacy data leakage on the chain and the problem of crosschain interaction of private data. In response to the above problems, a crosschain privacy sharing model based on an improved notary mechanism is proposed. First, the model designs a crosschain data sharing mechanism based on threshold proxy reencryption. This mechanism stipulates that notary nodes need to pledge a certain amount of tokens, crosschain initiators need to provide a certain amount of crosschain rewards, and honest notary nodes obtain tokens. Coin reward, the malicious notary node deducts a certain amount of deposit and gives it to the initiator. This mechanism effectively reduces the possibility that the notary node is a malicious node. Then, design a token locking mechanism based on hash locks and Merkle trees to ensure that cross chain initiators and notary nodes can achieve data trustworthiness across chains without mutual trust finally, experimental results and theoretical research prove that the proposed model has a low probability of malicious attack on the notary node and a high cost of malicious attack, and the algorithm used is better than other comparison schemes in terms of encryption and decryption efficiency.

Key words: blockchain, Merkle tree, smart contract, hash lock, notary mechanism