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+**Title**: Update timestamp verification
+**Date**: 2021-12-08
+
+# Summary
+Update the condition which is used to determine whether a tree head is fresh.
+
+# Description
+The current Sigsum API documentation specifies that a witness must not sign a
+tree head if its timestamp is older than five minutes. The current witness
+implementation uses an older interval that was looser: +- 12 hours.