法律术语，指一系列客观事实与物件所形成的证明链条。公安刑侦人员在破案过程中需要广泛收集证据，当所收集的证人证言和痕迹物证有秩序的衔接组合出犯罪嫌疑人作案的主要环节，能够完整地证明其犯罪过程，方可判定其有作案嫌疑并对其采取必要的刑事侦查措施。法院在审判时必须根据公安机关提供的证据链对犯罪嫌疑人进行有罪或无罪认定。
新的改进使协议不需要时钟同步机制，还能通过使用一种称为证据链的证据管理机制使协议实现效率更高。
The newly improved protocol needs no clock synchronization mechanism between principals and can be efficiently implemented by using an efficient evidence management scheme called evidence chaining.
其核心功能是：通过数字认证方式，见证创作过程和结果，将原创作品作为证据固化保全，形成严谨的证据链，以作为司法采信的依据。
The core function is to derive the original work into tangible chain evidence as the reference material of judicial practice through digitization the thorough work process and the result.
对既具有间接证据也有直接证据的一般刑事案件，要求达到全案证据链的完整性即可，对全部据间接证据定案的案件，则要达到证据链的闭合性。
A criminal case with both direct and indirect evidences requires the integrality of the evidence chain of the whole case, while the case with only indirect evidences needs a closed evidence chain.
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