公有链（以太坊等）
Blockchain is as we have described it, and includes many of so-called public chains or public ledgers, which are permissionless to join.
2.4.2 State Machine Replication (SMR) 复制状态机联盟链（Hyperledger Fabric)
SMR includes many of so-called private chains, consortium chains or private ledgers, which are permissioned to join.
2.4.3 Blockchain-centric Multi-ledgers (BCML) 基于区块链的多账本BCML is a set of ledgers backed by blockchain.
2.4.4 Decentralized Multi-ledgers (DML) 去中心化的多账本DML is like BCML, only that there is no blockchain in the middle. Anchoring by ledgers is redundantly performed against one another.
Saito K, Shiseki A, Takada M, Yamamoto H, Saitoh M, Ohkawa H, Andou H, Miyamoto N, Yamakawa K, Kurakawa K, Yabushita T. Requirement Analyses and Evaluations of Blockchain Platforms per Possible Use Cases. arXiv preprint arXiv:2103.03209. 2021 Mar 4.
