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 0x2c6783488728baf1f999a306df8b5269f541535433c9ea4113c3992341a71a2b. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b1b7db97-5f5a-49d4-a79b-cd3f505f8d2d.json and https://artists.proofprofile.net/proofs/artist/b1b7db97-5f5a-49d4-a79b-cd3f505f8d2d.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 0x87aae23bbe29f21f9aa76efa03cdb04f75dd6a787d58bf2daaf6fa17a8e891ef. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/QZFZ41926250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x605dd330d814079b949b16740ec356a8209bef7c773336c2b5ecf771925edb0e. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZFZ72387170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98ff00a897805c7f417ad0ed9a88c2fbd96d0baa3658d937d314019f778386c4. 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/QZFYZ2065736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c0a12c88e2a33dd3ed6410ed263e26ec03c75deaf3bcafaf173b0d5c2be1c1. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZFYZ2065737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51f11820fb85f15e72f3cc48984ceda3070a4aa43c9d2814bfbb1c43661f591c. 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/QZFYZ2065738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x802c67f6d3e091aec75c007f34543953c3bc604725eaac65ecb82d112608672c. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZK6M2231991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c7a266b64e411ce7aa9d8f0fd230d3e29c05145bbd650e6ebaa5d4c6d98500. 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/QZK6M2231992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c2426c40530728a38fdeade8748e3562fd14dbf0c2eacfb1b62892c1ae183b. 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/QZK6M2231993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4471aaf36b2c46b93372ac4322140e5b57b570ab85754ae3914e243aa3881054. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZES82368161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3245f44fcf81c7864ce06041df563978335e430b85d8b1970798a725a7c13b3d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZMEM2342063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5223de5d47ca27374a18f5d700993cb4665724c0c695922a99286c4611db927a. 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/QZMEM2342064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd04144e882bc94efdb380a98a907943e92b08536f205fd15bc04416d8a1fd6b7. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZTAT2333935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56839be5c6c923ff115165cdaca8b843bc80a4e1689df9197e24dcb3c9520d9e. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZTAT2333936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd8c62dc684b57032c13104931a3600b6fadbd4947dc79fb5e8f60880a81b263. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZTAT2333937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f148ffbb1b1ca30411f0f0d7d858166d5d174de90b1c00d0edba37c034183ef. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZNWZ2463485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1caf0cf02d5b2b40606c14dcf3bdd3cd5124eeb6695a3e664acc689b1e2a0428. 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/QZNWR2403911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38025ac496769dd0ada9524c35c76b0279945ce080e2fc8cf2854114e9fa3c18. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNWR2403912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfda55a064140a917457951eb604f19c2666585b606e76d6a7e6347875cdba8ee. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZPLR2499964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc97253d7f9fda68c021ba6bb08df8de168824b50444432b71a45764721ce5f1b. 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/QZPLR2439352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cf1a3e3f5e8be7ba4ef4eedc1b450a947329d72b1b69e8156626f4d08283ed4. 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/QZPLR2439353.