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line (https://c2sp.org/tlog-cosignature, Ed25519, key hash alg 0x04) with your name and public key. We verify it over the checkpoint body and publish it with the head.","reads_as":"A witness signature says a third party saw this tree head and that it was consistent with the one before. It is a statement about the log's history, not about any receipt's contents or any agency's statement."}