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 0x221205dbad9bca75f34cee76574ef672aceb39736fb15bc8c29b5396ff0a5f26. 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/c2e4272a-a7b9-48a0-88cf-4781c357271c.json and https://artists.proofprofile.net/proofs/artist/c2e4272a-a7b9-48a0-88cf-4781c357271c.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 0x8135b51bd15af4b1885b3424d434ef0148ba10814e466b3f257c87f26aeb4f23. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZK6N2389407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x888e74ccf4b86d2c39788ddb6f5f82bfd00981a61708e42f00fb05e94d1fe02d. 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/QZK6N2389408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fce7384845faa4c8d0c0bdbb8acc7a5f2404695d5a3388dbb1735351f22c14a. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T16:28:12Z), 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/QZK6N2389411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc23a99da35d12d405ad05d2db3b9376f7322db498601575adc19bdd2d29abc2c. 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/QZK6N2389413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d73833bf2e2eda8f0bcb4f9b9e16dc865b2c57176396e1e7e755b8b75d8162d. 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/QZK6N2389414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77a6d49dbc108bef32e72bae636650fff57503cd91d6caab9944580d316a2a9. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZHN82470917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c83ef1c4c0e643963f5db630557d01eb3adbbc3b56d87946cd93c0e6e1c2524. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZTAT2446201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bf67acb54d06fc894a5c906e3d89cb5d236b7ceedaed0e09e37a8d0a5147c10. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZTAT2447351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5630db979eeb033d65a8941898bf1aefc94f400f2cf82953ff452a4f938ecc49. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QT3EZ2433388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dfa1d7ac0ce2738dafef63cec5e0e955bda85019cc4da6909ae7e15c7e8772b. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZHN92588716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x707d22992bcb0ffa8a939e5df47e20c9d99a153e5849e3f0687ce46b5a2f4d0e. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZHN92588717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5630db979eeb033d65a8941898bf1aefc94f400f2cf82953ff452a4f938ecc49. 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/QT3EZ2433388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b51b8eacabe5ea34dffa99b5e89528767c0d1dd9265c8ef3930cd55700af511. 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/QZFZ42530904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec45f04ccd4943825af1449be3f8e873f70e1cef9e63f0c5f7bcc16ab37b98e2. 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/QZHN92588720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1921ca5f6bd3b71c3ebc3ea4294b75fbb8b95a27348c8ff4bbdb0089dd59285e. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZHN92588721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cdc94ced425defaf1697e363e7c9201bd23ad4ffd49b9dc13ac56249f79faef. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/NLCK42513448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a6913b714546831dfcf7a07a45d5430bf3e91829762612fa497bfa8e8d3ca74. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/NLCK42513449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e0726c80d00002d793aed441caa10868293ebc117ef3e0edde54c3a6c9476ab. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/NLCK42513450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e3d62fdba0a60e66d52de454ae7c22481ad4a96114c70fe2bb4c79e4822e6c4. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/NLCK42513451.