关键词: 区块链, 储存扩展性, 数据副本, 验证节点, 可检索性证明

Abstract: Nowadays, the maximum storage capacity of blockchain is limited to the node with the minimum storage capacity in the entire network. This paper presents a scalable model for storage capacity of blockchain, which fragments a blockchian replica and stores the fragments in a part of nodes. This model adds verification nodes to blockchian system. These nodes can detect and update the storage nodes stability by using the POR (proofs of retrievability) method in real time. Thus, the model records the stability values and chooses the high stability nodes to store the copies of the blocks. Finally, under the conditions of normal running, node failure and malicious attack on multiple nodes, the experimental results on real datasets show that the scalable model not only has stability, fault tolerance and safety, but also reduces the amount of storage space.

Key words:  blockchains, storage scalability, data replication, verification nodes, proofs of retrievability