这是一份基于比特币区块链的密码学证明，确认该内容在特定时间点已经存在且未被修改。

A cryptographic proof that this content existed at a specific point in time and has not been altered, anchored to the Bitcoin blockchain.

新发布的证明需要等待比特币区块确认（通常需要 10 分钟到数小时）后方可独立验证。

New proofs require one Bitcoin block confirmation (~10m to few hours) before independent verification is possible.

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