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 0xfd96d6b8c2cda9c380543d33571bef55ed788da3fca381828ba3652701864a52. 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/528fff87-0192-4fe6-8239-7d6655991916.json and https://artists.proofprofile.net/proofs/artist/528fff87-0192-4fe6-8239-7d6655991916.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 0x59670ffa3f58b9afc855f3380063f6889c44e5a7a8627bee600749961cadc0a6. 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/QZNJY2224177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd27f18dbbec5b509de293b72ebfc71e3df7f96ba50f4afee122d0b0128390bdd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US7VG1688003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49cfa562a8b07eecda30210938bd9b15f53132e0643621d49e5667e8e49ae570. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US7VG1688008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3090bf4c9f56e94e1b949ac5b25f5e4c8260bd564825ae4f9b089b3bdc302d7. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZHZ31930020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ffbfdbc1b7d352123c3e1d356b7bda7b9e061c9e6c326b20846fe712ee37a35. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/US7VG1611290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f50897e4915441e6cc5905ea415e2f304b5c0b9f00c86aa8ecfb9b4a59b72aa. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/US7VG1611291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2269f545cee6c68a58535c43ed2163433acb995b5b15b026ed61b843db30f1d3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNJY2419233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x020db62c90643665c9036ea84ff8093e37c60eadf11f7766af636e75798140da. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZGLM2452896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1762a0645157b82e267f65b50f5e673683d008f0b7d3c813a14b73e82029df7. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZNJY2432091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6b19ef9a4a9e91f98f57b6d456b934a6f16da09bedf8beba8a80de8b8e1d519. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZNJY2432096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2269f545cee6c68a58535c43ed2163433acb995b5b15b026ed61b843db30f1d3. 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/QZNJY2419233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda669018bbf61aedcbcfe55992ef48bc383f68e62f488363d0efac42466db9d4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/US7VG1718545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fbb04990df3e99f2e9a9936071b308e246f8349a5ffb10dc677770efc367bd8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USCGJ1527397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0313b0b2934ee1c3ad466883ae554508ef1fa6c2e1a8ae799e99bbd0b0accfb. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZ5AB1610702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa892eeba154f2429905d18af90b0aa2a408aa32a14f99461dc2ec964dbdf60ac. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZ5AB1610709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a9967c3e9c1301068f6a4ceb5ee71cf2cda9e6fa7c0790ca46faa85c94d73da. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FRX871521892.