Research Article
A Data Preservation Method Based on Blockchain and Multidimensional Hash for Digital Forensics
Table 1
Comparison of some blockchain architectures.
| | Blockchain | Bitcoin | Ethereum | Ripple | Hyperledger |
| | Architecture | Electronic encrypted currency system | Electronic encrypted currency system | Electronic currency settlement system applied for payment | Blockchain platform for commercial application | | Type | Public blockchain | Public blockchain | Consortium blockchain | Consortium blockchain | | Consensus algorithm | Proof of work (PoW) | Proof of work (PoW) | Ripple prove of consensus algorithm (RPCA) | Practical byzantine fault tolerance [21] (PBFT) | | Fault tolerance | 49% | 49% | (n-1)/5 | (n-1)/3 | | Smart contract [22] | Not supported | Supported | Not supported | Supported | | Block generation time | 10 minutes | 15 seconds | 3–6 seconds | 3–6 seconds | | New node and block synchronization | Adding nodes dynamically not supported and synchronization takes long | Adding nodes dynamically not supported | Adding nodes dynamically supported | Nodes cannot be added dynamically and breakpoint recovery | | Privacy | Anonymity, unable to audit | Anonymity, unable to audit | Support privacy of individual transaction | Member service management, strong identity authentication, auditable | | Other | — | Introduce turing-complete smart contract language | Introduce UNL trust nodes list | Pluggable consensus algorithm framework, electronic currency |
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