Why does a TSA first appends the timestamp and hashes the combination of timestamp and data? This product is then signed and send to the client back with the timestamp. Why not signing hash + timestamp?

  • What is a TSA? What protocol or system is this question about? – Pieter Wuille Sep 16 '19 at 15:05
  • @PieterWuille Trusted Time Stamping. TSA is Timestamping Authority. – user674907 Sep 17 '19 at 15:55
  • I don't know about that, but a quick search tells me you're maybe talking about RFC 3161? If so, that seems off topic here. – Pieter Wuille Sep 17 '19 at 15:56
  • @PieterWuille Yeah. this is the protocol. But I do not understand the design choise. – user674907 Sep 17 '19 at 16:37
  • This seems unrelated to Bitcoin. – Pieter Wuille Sep 17 '19 at 16:38

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