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 0x6932c619f212a8b12e491dea68fcc0487c0acbb5ea7e3307fb7ffe72d2226fe7. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/83c7521b-99ec-4260-a2bd-79ed0f1e1e5c.json and https://artists.proofprofile.net/proofs/artist/83c7521b-99ec-4260-a2bd-79ed0f1e1e5c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).