基于变色龙hash的区块链可扩展存储方案

区块链中的节点以副本形式保存数据，随着时间的推移，区块链中的区块数不断增加，导致节点承受的存储压力随之增大，存储压力成为区块链应用落地的瓶颈之一。为了解决区块链中存储压力问题，提出了基于变色龙hash的区块链可扩展存储方案，该方案利用节点被攻击成功的概率和改进的温度模型，将区块分为高低安全性的冷热区块；基于变色龙hash算法和改进的Merkle tree,对高安全性的冷区块进行部分节点存储。在存储过程中，除高安全性冷区块的区块体信息被重构外，其余数据保持不变。仿真实验表明，在不改变区块链结构和安全性能的情况下，所提出的方案可减少区块链中数据的存储总量，减少存储节点的存储压力；且区块数量越多，其优势越明显。

Scalable storage scheme based on chameleon hash for blockchain

Since the nodes of the blockchain save data as copies, the increasing number of blocks in the blockchain leads to a raise in storage pressure on nodes as time goes on, and the storage problem has become one of the bottlenecks in the blockchain application areas. To solve the problem of storage pressure in the blockchain, this paper proposed scalable storage scheme based on chameleon hash, in which the blocks were divided into hot or cold blocks with high or low security characteristics through the successfully attacked probability and the improved temperature model. Based on chameleon hash algorithm and the improved Merkle tree, the cold blocks with high security characteristics were partly stored on nodes. During the storing process, the data remained unchanged except that the cold blocks with high security characteristics were reconstructed. The simulation experiments show that the paoposed scheme can reduce the total amount of data storage in the blockchain and the reduce node storage pressure, without changing the blockchain structure and security performance. And the more blocks, the more advantages.