"The Chain" is a song by the British-American band Fleetwood Mac, released on their 1977 album Rumours. It is the only song in the band's discography credited to all five band members of the Rumours l
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f458d6350680fa2f753d9176a64d7dcb1a22af3dab250cc793cc9a56f1883c9. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4d253cc7-acb1-4f96-907b-8369c380625a.json and https://artists.proofprofile.net/proofs/artist/4d253cc7-acb1-4f96-907b-8369c380625a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).