Watchman or Watchmen may refer to: Arts, entertainment, and media Watchman (film), a 2019 Tamil thriller film Watchman (novel), a 1988 thriller novel by Ian Rankin Watchmen, a 1986 comic book limited
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c8793e6657392f00d767c95465dfb26452290d1944deedf40a80c8c61403689. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b3e4f7d2-d4ea-4d09-a3d4-cd6b9c37a961.json and https://artists.proofprofile.net/proofs/artist/b3e4f7d2-d4ea-4d09-a3d4-cd6b9c37a961.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).