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Certifications also have a writability expiry date

Original change in https://github.com/ucoin-io/ucoin/issues/128

Protocol rule: https://github.com/ucoin-io/ucoin/blob/master/doc/Protocol.md#certification-writability

A certification written now has a sigWindow * avgGenTime delay to be written, otherwise it is considered too old and will be rejected.

This rule is mainly here to avoid spam.

Possible Sakia bevavior

Certifications sent by uCoin nodes with a too old age should either:

  • no more be displayed by Sakia
  • be displayed but with a color saying "certification failed to be written and will never succeed"
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