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 0xd644ba045b70b0f16ba067db9c1f75c97763ed6f227a3703bd98897852f6a249. 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/cc406a7c-cc1f-43a1-9f09-bf38a0e485c4.json and https://artists.proofprofile.net/proofs/artist/cc406a7c-cc1f-43a1-9f09-bf38a0e485c4.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 0x00f19b68885ba62a05358b9b080f9f813edc83803d96394821ffda2d609dad13. 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/QZWFF2374039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d21541815e8f3d1abb2e37db910d4d52231b1fe851186d3f3ce034e51df0cf. 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/QZHNB2427105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79f4174fcdb6362b484f5927fb387d1133511db09963905b669edbd904031190. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZK6G2490892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae526f2e2e1a9c5235a9f26cd4d4c1a2e139fe07d443669a76816e04f9e8bdf7. 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/QZWFF2408876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x371c99d99a86043cedd55640dfe57da4b654ef95ea310cb41ae446e6c60da63c. 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/QZWFF2431937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012a52f067919e857b23eef8c29df2c3bac6fd7a23f2bc1a06b4e7b110cdc7fc. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZWFF2433796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22d62f1a1bece9c4199c300ec290054591de6e3797b509fd1f3cd6f9828e91c7. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZNWY2423411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x651bc584199abdaf5a005707176e0f83ffb17451355248903eeeb91005959473. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZZ7Q2438639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x330b41f4bc09d846c4f805befbed97a1baecb8a6c1c4f34be5a2e0ff876ee409. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/QZHNA2470099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x337fdf1d3731d5b9fb168175bc79a347c7dd24f74cf612c6f4b9e571371c32b3. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZHN42532767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68fa18b00cd4414d6a268776948d33f66ffb8632848c772d433904a8999d5f6b. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZMEN2511379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec344e54041312e70d69a68947c0fb125643c3702a43b68e0aaa60b0e630ef17. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZNWT2552544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18cbe05f87e23c6226dfc6915f5e49fa2b4a98e17054f99cb78a014764a778cf. Chain 2 (Bitcoin): anchored in block 958303 (2026-07-16T16:39:24Z), 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/QZNWZ2527134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c1cd593799a7013837420f2cd1ab4cc16173f4fa8610a1037b8e14d6fa3824d. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZRP42536698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a3c71e7f8dbe821976fdbb8b2d199999afdf9bc1da5526547b487112ebb71db. Chain 2 (Bitcoin): anchored in block 958863 (2026-07-20T10:27:46Z), 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/QZTB52508979.