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 0x99f604724d4ebf325a9b78e1202ab8a47ad318c18cbe3a9df6603e562db7edaf. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a4f0b12f-283d-48db-bfe0-c22270c7a457.json and https://artists.proofprofile.net/proofs/artist/a4f0b12f-283d-48db-bfe0-c22270c7a457.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x5650d91d926d4738637489cd4d93890ad2b5f29797c54e63add7bbffeb283f49. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/FI2RC2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0aebeb84398aa8623245c8de8f20bba0b4d3646d6ee5f0f84e3f8609fbdba29. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/FI2RC2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55bdb71b08b308ef9d876ff6ee1c2cb08f61b8b9b0e916a0fb67eaeeda5424a3. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FI2RC2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1017aa0cd45537d26a899546ce697a1ff9262d238532ed0bf3ac76e4da3be087. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/FI2RC2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bb9d9708119b4298fbb7aba369da0d283045a3fc97fa3c2560551c50142bb96. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/FI2RC2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de575e19e149dfbeaaae5d9d69777a94e13b80f5fc5cdc06410584474d80ac6. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/FI2RC2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc11e746eb7d7ab15a69b89975e54b368ab990802ecb9ac1e2a0b0b19c8198f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FI2RC2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf4a3dc0d9e3d11a9e53999c7773eb8d4e41bc3bb60faa56d8900109c189bef0. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/FI2RC2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x244ffc0d3625772288efbcab25343d265864bb24aa7e3e9c3d93446f9081abbc. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FI2RC2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3b347351d6226d38fcfacaf6e0966e1359efb8b95b320f53cfa34a1997beb80. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/FI2RC2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e6431caa87186962d67eaf0816542dcac379ffd9ed25b07649900e59a23ebd. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FI2RC2500005.