开发文档
依据 TDLib 源码文档理解群组状态链、共享密钥、签名和表情核验，明确当前协议的信任边界。
来源版本 a94b83d67ab4 · TDLib contributors · BSL-1.0
依据官方资料整理，由 GetTGAPI 独立维护。 文档目录与术语表 →
此处的 blockchain 是通话参与者共同维护的状态账本，不是购买虚拟币或支付网络。区块记录前序 Hash、高度、变更、签名和状态证明；应用区块要求全部通过，不能只接受其中一部分。
变更可以涉及键值数据、参与者权限或共享密钥。区块内前一项变更可能影响后续权限，校验顺序因此是协议的一部分。
媒体包以帧为单位加密并带签名；序号用于防重放。共享密钥按参与者分别加密，下发失败的参与者不能继续参与核验流程。
表情核验使用承诺后揭示的机制引入不可预测值。源码文档明确指出，当前方案的安全性依赖参与者核对一致的表情；不能因为“用了区块链”就省略该步骤或宣称获得永久身份认证。
阅读完整源文档、对应 schema 和实现测试后再考虑修改协议。保持成员变化、密钥变化及 UI 中的参与者列表一致。无法解密、分叉或签名错误应清楚失败，不静默继续播放。原始文档与许可包可从页首下载，本文不提供简化后可直接投产的密码算法。
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