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 0x6745592731637715c4a987b8b46f9aa8dc4b70c0dbf746b79e1072f697d4db63. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f8a178c2-71c3-4108-b565-b830a8dc3e5b.json and https://artists.proofprofile.net/proofs/artist/f8a178c2-71c3-4108-b565-b830a8dc3e5b.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 0x16f0dc14c9dc0b44d616fdf7eb23d65af7996ab2af8eb49ee6ef913b7f232d58. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/PL44J2100036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41a102c3e467c7d6a82343200c9f594c8880295e30aa7d307fc6ad51d3c6052b. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/PL44J2100037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1856b3e8eb367b216a648ec7226b8384ebab3fbc760e49a2e1d3bcd52c08924b. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/PL44J2100038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6bd04d10621aa190ba3bda040dab2aa1151da44386cf93d2736add3b6dbcac9. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/PL44J2100039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ab375eddaa200a94f0fc96a34185ee36636003c71b50a8d4218bcfcdd64d9b9. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/PL44J2100040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7fc4ad749f74848f5e70dd4bbcdc9e697c9f4b3de7686deb275c1195e6b574a. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/PL44J2100042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4af1656c8e07b176cddb27cce905b95d6266f4e9cb9bd7e34d77c08793466da. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/PL44J2100041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x284ba8bcee0449aed8b06edeb93871d81ce4e87e1f9e147ce1477980198c376a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/PL44J2100043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37204291d8c43843e364889cb226d7eec65d7967a39b4fcfb7b98288c6b1bce8. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/PL44J2100044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97fea6b73a51da598e5cf4057acf55ff5b0d185087cc1ec678ceba2a2274c069. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/PLH492152887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7ba7ae98af1435d9606e0eebc07127a594e03efb1726a4c640f4ff3f5f268a. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/PL44J2100045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9435daeb075f5e377c4c30e9e567ccec2ed9ca131826784cfd59dfa1d06812e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/PLR112400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c67d3d8cdea9eea01591973dd4551cc05088e73e2396cd9ad774e787d5c470f. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/PLR112500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6bd04d10621aa190ba3bda040dab2aa1151da44386cf93d2736add3b6dbcac9. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/PL44J2100039.