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 0x99d4959023ea2cb2c6f11bf0bd064473b7d70d221d0f794fcb97c765422ef8f5. 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/e713dd19-3b52-4f2f-a70f-8ff70fe3fd1f.json and https://artists.proofprofile.net/proofs/artist/e713dd19-3b52-4f2f-a70f-8ff70fe3fd1f.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 0x07798be6ebea9baf373d0f41f838aaccbd3c4cc83e405fe65bffc9721fb9c64a. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZDA61999143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x759841a8910bdbc87d02060899494e1ba5a5d61c2e5c690bf8484939105ec569. 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/QZFYW2065780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87ee3296da602ef1fcf38b8642ea5fc9471289cecaec8ef94ccb52fc9461b45a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZFYW2065784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec59182484618623fb40f1a763548ccffb84a9611b33052ff86f6d9ca4471089. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZFYW2065785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x990659ddd9b4bedd566fd7c2eeb58c1a0431f2444d05bcc472635c5138e32d16. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZFYW2065786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe03b2e54a16edb8dbdb6d4d5ed5f2994548599526eb666f5198559c2eee2097. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZES82163541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc01f278ef6586ea61f594c1dbe3b1bb102ac6681e2b47f92129d849a8ff40cdd. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:06:29Z), 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/QZRP42252567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc01f278ef6586ea61f594c1dbe3b1bb102ac6681e2b47f92129d849a8ff40cdd. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZRP42252567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aeb7e551b0b7b7e22a0d329d3dab4736e0cf1b6cef7dd01c083fc9705635edf. 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/QZES82376636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cddd5809468b77ccfa15f65aa26682e278e941aafb90d594081b83489fde5ea. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZES82376637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x935dc7a988f49cad893fd7e8bcd7160e412ab5c399863116010c3ee9d96eaaf4. 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/QZES82376638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc2ed669df185f3495335ce103864081559110392d324742ff43eed10e01b05e. 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/QZES82376639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe081396abf70b4d055a52087fc9df0193bd5f64909f0db702f4a0e01166a86ce. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZES82376640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x935dc7a988f49cad893fd7e8bcd7160e412ab5c399863116010c3ee9d96eaaf4. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZES82376638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7540471e4c5c77ae766a2b4503f74e247094c7a17d7c07e9be9ad9e36dcdd4ab. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T03:59:24Z), 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/QZK6Q2477109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89d50ad70e8783bce332e644fe086da5d5726525d83a8f80885b4da00fb53e04. 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/QZTBC2475534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89d50ad70e8783bce332e644fe086da5d5726525d83a8f80885b4da00fb53e04. 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/QZTBC2475534.