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 0x3f6a4caea9f29854645b4ec6a41d0306c65b003baccdb11ac035dbad0f3b675a. 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/61195db4-b184-4205-b056-9a4423d32029.json and https://artists.proofprofile.net/proofs/artist/61195db4-b184-4205-b056-9a4423d32029.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 0xb56348b086e0e5f535dc3faf542e7e948173319b94ac66ba93d1c39e094e74bd. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/CH6892100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c9de6dbd33d426ba9decbd61c4224e851cdb819e652580e8a76b5a1cdd0c66f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CH6892100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x478a392b5cece73242b091f3e000fa970aae0b0879bf22f02fac338d35e90a14. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/CH6892100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b4ece46a7f3c70897392a054f7a7a0937f7a0b77fd7d5142efa41dbe3b0dfe. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/CH6892100024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f778eb2ae974221af5e9b80978a21cde278a2599460560078c793eed3402d67. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/CH6892100027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7219bb0946f6ae79fa00b7c6e65bca8952440dcbd7740777ab9d3d72a6adab49. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/CH6892100028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06be674180ac4ccf3c936d68a56f7c65816a0038564f4414e651ace2477f1869. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/CH6892100031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99f63d923835e692e3b2b117e47bef360a04c00d242af9ae428c85daace74f23. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/CH6892100035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b82bc0b0ffe4cb1bd111d22127a5a3dc9fcb19614158e87b0c7cec96e664a79. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CH6892100037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79197d5232b7049bcd0b11352490671e6e93b05d05c8bd28393e16aa1b8259f6. 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/CH6892100050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ea0c165edefa3aaae84bd4196acb88338cfd79143d080a5c657b3014f95a7fe. 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/CH6892100057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8368d713a46385d9bef6645f9f598f0466e1042fc9d24c62e34ee932d24bac1. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/CH6892100061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4921b89c71d7c0b19ecf7a7b50fcfd3f86749339d0716065eaad947603966b69. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CH6892100070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a16491411532f1eb86207443ef360ff891ba22f93927c39d8c4120d5c816776. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/CH6892100119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd2f063568589e38faa528a1a411007f69a908b728e3f10b348971b2bd6743d6. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/CH6892300803.