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 0x21bdd4d88f3dbd536ba14b40740c7e38b89ee809f08ec9d902ac944ea9647ed0. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4ea431bf-c572-4c4c-807a-485224bba154.json and https://artists.proofprofile.net/proofs/artist/4ea431bf-c572-4c4c-807a-485224bba154.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sketch (Boku No Hero Academia: My Hero Academia)
Hitamuki (From "Boku no Hero Academia: My Hero Academia")
Hawatari Nioku Centi: 2-Hundred-Million-Centimeter-Long Blades (Chainsaw Man: Ending 3)
Mortal Kombat Theme (From "Mortal Kombat")
Bakuryu Sentai Abaranger (From "Bakuryu Sentai Abaranger")
In The Back Room (Chainsaw Man: Ending 5)
Through The Valley (From "The Last Of Us Part II")
Dengeki Sentai Changeman (From "Dengeki Sentai Changeman")
All Kinds Of Kisses (Chainsaw Man Ending 7)
White Noise (Tokyo Revengers Opening: Season 2)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0xf2d5f1d884831a7fb1dd0106aa147c4fba29719b8e613a436c4dffe380157ab5. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US7VG2324885.