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 0x2779bdf2416fddb72d21f17de0c599231aaffa7f21c2eea635332437b5bcbbbb. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fc4f8c95-a17d-4b85-b8c3-bfad957de5a9.json and https://artists.proofprofile.net/proofs/artist/fc4f8c95-a17d-4b85-b8c3-bfad957de5a9.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 0x0b6b98b1262262716d2876440e0c92f3bab9fb33f0fc143bcc1930cbe126cf28. 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/QZ5FN2257600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c1e742e38a5ccad79d928a715b7eb15f15f9b8e4d000a16559ee55f69ec1ed. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBRKQ2176401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa00dc1fd6880e1a069d086329a8bd63f95aeb07d74739f67e8b4a12878e7546e. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/QZWV32347666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd7368862abbcf3886df9a5a5f86807ae4b85929e631cff59f02f4f73ed95d6. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBRKQ2376325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e6d7d5ca8b66c8eff99574e5b384aadbe05f836802db49ebdcb45c3f3b49be. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBWUL2245390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b6b98b1262262716d2876440e0c92f3bab9fb33f0fc143bcc1930cbe126cf28. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZ5FN2257600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d4495459c36170e9fbf75771cf41041fa15b4ac9551bf087e22e7354781297. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/GBRKQ2122507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x052aeb289d20a0520713967134a4cd0eb208633e07b86eb0654d74f40742f778. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBRKQ2105997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3bd158d6fb9e915f3c2d751bb7d502ed048ea429c4afa862db6ffb5f175593d. 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/USLZJ1907931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05afd3c915a14bc25adf69b51ba5ba22b732a900d3cc0c6d60e2beb77ceffe5e. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZ5FN1957015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca58d53bc3bc262763dd72b970ce3b6e0915ff1a8b0e402a2f252adefa1ccf1. 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/QZ5FN1932362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd927ab735daf12cd85c6b9a9d1b71e140db364f27c73a87cfb49273af14351e4. 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/GBWUL1816755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24fcabed78b3f577e048749ffcf1c5567d3f63f556844006e9039f878a47f841. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USLZJ1886701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fab45cf683351ef059d38142c1841b42f2048de2003829dd5dfd68689818e02. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/USHM91634556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b84cfc10066fe1f279114fc0c8dec164243723c0a83675f6945db956a784de0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USHM91634559.