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 0x62db80439c26f52287e34db1252fec3152a98fb3c6a23b3da6ddd33a6395e87c. 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/b2bd4acd-0be3-4791-a68c-bc7b9b9b89b7.json and https://artists.proofprofile.net/proofs/artist/b2bd4acd-0be3-4791-a68c-bc7b9b9b89b7.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 0x05c9442707841a50f47452901507f3e6c5af9731b2d3dd6f75fae2e901c4ae88. 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/CH7812361218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5694a57c02ab3ebef4239f133bf506cc80ce20f8532ff3fbc7d4cabb647c211. 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/CH7812351804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1512e2483fbe60961ae6a53e4021a1103affaf906d99b7aa40153faffdf0e323. 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/CH7812343855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf12d3a2173e01786bfd54f07b2c6e7416c69a0b7df85fe884712eac56c5474c. 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/CH7812403093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5462d37122fb787d8577e0b5eb3ab36a349bf521542b0f6ffea6f9aaaa0a2c7. 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/CH7812402268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c08384779f11333860486cf4e49bf4f6cfdedaf48e6fd69792f7e5cea1bef7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CH7812401397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154245c63e3731f96569940840b71a7ce17df5d812932e1c866b200a2d5c2459. 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/CH7812400241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88317aedeb56f9a0826e4d37c63e2d64611f280263947b43ff31ed9a20d42c12. 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/CH7812400037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1082a63761b8957504810653c96d25bb8cb1deb0b32a840ff854a510ac7dce56. 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/CH7812371191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd47fe900b2de68edfc519ecc36a606b83c52fd4cba768a75ba0be5a7e83e540. 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/CH7812355804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52edb0a2c19def9e9b0fd7d5f382e60ec6097f30f0d080ebb89358e200e64a90. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CH7812355603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99b6986947003d49f4979f1b6416d70b09fcae0182f4be90e611fb977b7d31b7. 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/CH7812349218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2cdb0e0f03596e3462097f29025545e08e1573b7f68f917834db9c23bc7c2d0. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CH7812239565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20879b2f606ac2bf3a8679bb9f733b2ff59733ed9a7440488f2c12ea479ab678. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/CH7812239566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe727ec69d4b7a8895d65a09ba1b5df4fe1909401039e9d07d79397fa8d55f85e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CH7812236070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaeff9777a85bcbfbe9b538a905ddae98947d1ceb61312aa9a595146a3da43c0. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/CH7812410725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f3994f3c5a82569214b4ae4a7e2b320b38e5c67da832098d6f9f280048d25e0. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/CH7812410728.