Colin may refer to: Colin (given name) Colin (surname) Colin (film), a 2008 Cannes film festival zombie movie Colin (horse) (1905–1932), Thoroughbred racehorse Colin (humpback whale), a humpback
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 0xc8b7970c00ee205112ac86b37841995806a33cb77503e70ee0efeb64a9594a4c. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b60ca3b2-62e1-40c3-9d36-caf098f8a0e5.json and https://artists.proofprofile.net/proofs/artist/b60ca3b2-62e1-40c3-9d36-caf098f8a0e5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).