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 0xfcc6e9869998228fa1dd17d8201a8b6597709e85762caae6d2767f4d29283d71. Chain 2 (Bitcoin): anchored in block 953638 (2026-06-14T13:10:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/38932731-470e-4625-b4c9-c87a529b1026.json and https://artists.proofprofile.net/proofs/artist/38932731-470e-4625-b4c9-c87a529b1026.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 0x34f4dae249257d5bf493555654584d859d1a88d14cc8df1fa653cf6943a101f1. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZ8LD1714637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52071041f0daa87299729e531c5b1c51fee9373c3d007eb292b49314fb0e6f61. 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/QZ8LD1720173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39590a437cd63147ec043348d63427bf4080207a2626ae6d4d69bc6852be5c49. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZANL1740303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1626cea08832a9b0fb25c00a4557168e882ae5340514bb724a4f80647a67468. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZANL1740304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6192d5cb3f4114f9806fe698553ceb2f656cc4c57a9e66cc12869e4bc054b4e8. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZANL1740305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa718b41371b127ac629bb8d169507c93deaeff20bf44a4cc3ac6db772dabcfd8. Chain 2 (Bitcoin): anchored in block 958658 (2026-07-19T04:09:09Z), 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/QZANL1740306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b422daa1af26031793792bc046aa59aac38490ee43e9c9aefedb0db4fe6662e. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZHN61919335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe83fa1821dc781820f46516353c3f0682316a8d95071fdb93936a2efe056e432. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZHN81950723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b422daa1af26031793792bc046aa59aac38490ee43e9c9aefedb0db4fe6662e. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZHN61919335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6042459c6f463cb02a4800890c1efcbdcc3a155f7a586c68c4d0fd9e18d377fe. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZHN81950721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe83fa1821dc781820f46516353c3f0682316a8d95071fdb93936a2efe056e432. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZHN81950723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb788971d976180c0be12a19429e6854f7180762fd3c6640258dc6f6f36c1d42e. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZNWT2590968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11c03dbcf5bbfef9b84615de3d9988f8b18b483e5d95ce74f67edcbce21b1583. Chain 2 (Bitcoin): anchored in block 957778 (2026-07-13T00:08:48Z), 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/QZTB62386985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7381b16b1923e4e7b7c14c2283ba29ea61cd2cfe29120468ae1f1fd6dc4b85f4. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZHN62486891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f4df8eec4681f48c23f19af6558b1262fb18bb1f8844b9c5c74ff0ceb3ad1e. 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/QZNWT2477810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b8f018d3893f7bfd22e9be303b96465da29c63b8752284dc3fe84e80303952. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZZ8A2544285.