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 0xe9819cee309f6bcef758aa6801c948967e7d736df261febcb60fb28eef3b6153. 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/db8c3225-a3ef-4846-80ec-5e1257b93c59.json and https://artists.proofprofile.net/proofs/artist/db8c3225-a3ef-4846-80ec-5e1257b93c59.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 0x9886dc577ca02d7a5b3e2615adabe04c028155e7d3f2dfc87149bb1097c30470. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-02T21:02:00Z), 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/USHM81260283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd6b19146f1ce4d44a296a85d32b2270b16c4ea45d177e8f323d55f948ceae60. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QM6UA1400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e6f114ed52ca1381a101e66824a9f1ba8edcf77e70de8e80b1cff4c66f2ab3. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QM6UA1400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f5df582fce9fa645755c0bd4fe46446e8e132a776a66b94f5c9261b4e4bb98e. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QM6UA1400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x930d4d25d5ff1f1079622c5344d96297685173e0dae8624e908a7295fc4c8bb6. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZCKC1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd548705e36ae8c08f17bdd4276821192689c96c315d36b1a686f1988b943aae6. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZCKC1800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c56ac4ffef19ee4e7a6ee11b2729029e4e0bf3f0504ec951b71f8e0c716039. 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/QZCKC1800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf13301580b7d2ba7c31308d0b4064bff636453335f8dd817cfdd28d3d8c7527. Chain 2 (Bitcoin): anchored in block 958368 (2026-07-17T05:03:25Z), 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/QZCKC1800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf44a897be84c3926d713001e71b08180c3cb7ab6ebd4a235f1cfd00de425493d. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZCKC1800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d42c136d17cf123e85c3133fac22dd3f5003038eef408b1fd0a073be91efa05. 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/QZCKC1800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6330a707b291075af51a68f75f232b8d3be99aa047cb86238959a20e432b1ba. Chain 2 (Bitcoin): anchored in block 957550 (2026-07-11T09:54:43Z), 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/QZCKC2100198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x679dfa116ee2972f073d580034d027009fe0eb0b872bc57ae37768f60fa97365. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/QZCKC2000180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea39ecaac46be50044c9f184217c070ae8cdfba33559716fbdd6a1d3d2cd707d. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/QZCKC2100202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b47f3ef933f49b21276038a49b8a86481aaeb1aa6eb8981b55f735d4e967ccd. 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/QZCKC2100203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce15d0f008898f441dcc3d1008e87fc1b83153ca3f669ad3653d52202bc6779. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZCKC2200261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8133819f05a3c1c79f6bf1927e7815ae51596e7b20c980656be346687b298033. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZCKC2100201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e4f708057e7b4fc2839eed15a467181a9268609a824d854b85a257abc5ef20. 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/USHM82100559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e4f708057e7b4fc2839eed15a467181a9268609a824d854b85a257abc5ef20. 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/USHM82100559.