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 0x454927475637888dda42263e80efbc0c1c14aa752675bf07cc0dbd0356bcca30. 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/2319a577-f6ff-4642-bf08-f8a58b6b5688.json and https://artists.proofprofile.net/proofs/artist/2319a577-f6ff-4642-bf08-f8a58b6b5688.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 0x9edefbb43b6540b61bf3daf40d93ecb383ac8a870628b151a78ecbdf8096ae3a. Chain 2 (Bitcoin): anchored in block 957965 (2026-07-14T07:07:52Z), 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/QZMEN2286619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe748ea23de6c8fe479adf735c39d9f728e9148a9b763a2f409bbedf910d9e91a. Chain 2 (Bitcoin): anchored in block 958474 (2026-07-18T00:59:09Z), 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/QZNWS2229399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475bb91d8e032037b6c1a5ecc45542e0450b43ce2436c3c2980d89f454885a2e. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZNWS2229401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa948990e20bdc1215ea34259b05af56c5b45c5df815c6f302403679f5355f6e4. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZN882295276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x876bc7665f9fd5578ddd98f7750b9aa0d091b326dab08c0464cb9b1a0f500de2. 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/QZWDW2210515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86faf48050dfa5d99704b69d39870a2844b016cf993eaf350f4e3832aff16cb2. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZTBA2273289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012de28bc0163256fa1a46ada1b48ee453fe68d56fcb762e3bdf4ad9ed3b40de. 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/QZRP42378771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6150ac205625dd54505f74aa10ff2cd40661d31600cbabced8018dc4128072f6. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZTBA2342437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x476a362f58da12de0476dceb45ac5a02a6e038f1e8f34be84ded242e2cd1eb40. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZFZ72498684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71ff99e9d7e0681df5d73caaeed19195749733c5072cef5312f5d99d8acbf913. 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/QZHN62457297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe74a2d2ddba6fd7803145678f94af9c883251f43e0e3ab962e9428ddebb95156. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZK6H2482055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36ea183c119cbd23d84256e0fef3ad4c15225b576b0de8b8dee5716e5bbf34a. 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/QZTB32447425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6c0077d99a37f3a46579f9019e888c1020665bfcd0e09d9e9b22c2b98c2d5af. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZWFQ2441240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce2e683b72711987377b53c8156d106656cbf7aa6b7643bc7592c7725c1e89df. 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/QZWFQ2457143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bc8d877f733e19b68b97a6519580eeced947e0b386718d23dd1216a968c4434. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/QZWFQ2472266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f1dbf817db08d2cce9cb608949672abc7e559adc763eefefe9bbbfb4f5d459e. 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/QZWFQ2477651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a352ede8a59576dfa0ed40c764374b95e876c7b492d3026b251ec922999eb7. 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/QZNWT2542343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c91b70033df69041db41d0453840d7c80aa0084878561422a68007aa128c73. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTAS2532211.