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 0xfe0f4975d468aacaef578c74d944d400cef20785060309a4d2a93e909a6e3098. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f80b8200-47d4-4209-837d-da40bcfe60f7.json and https://artists.proofprofile.net/proofs/artist/f80b8200-47d4-4209-837d-da40bcfe60f7.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 0x68aa9d3edbcab53d03545e9ab5e6442323b82c7b48f576803eb24beebe1ebb49. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZK6J2289151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9c965260cdad8b34b943d09e5e9734c5bc9da7e9fe63db4d48a674d7e0a6c52. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZFZ32398169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd71cb7c4970e330194873fa45b06a5da7bac439edad71915d90bc3df98e49ce. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/AUMEV2331331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68aa9d3edbcab53d03545e9ab5e6442323b82c7b48f576803eb24beebe1ebb49. 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/QZK6J2289151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe88da92d981493c0631c6485336f0bde1f5cc7cdf4d5e58c825dffb88ff25864. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/AUMEV2331370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb964e8e2449517974ca3f5019097346685b40df9ef232f37582e785a0c5ab7c7. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/AUMEV2331371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdec1dc5ef4fa9ac7ca62f8f44b1eb71f6f0d03b223b72fb1f0f157105c0cfe99. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/AUMEV2331373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d14efcafb40fb6ef774e7cdb35a65b3f3b7a884e3ce63984238567ba4d57cc. 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/FR9W12401731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x812ed64b8f28bf30fd8fb1df59711fb5f5a283177e63004c864e638c92a92971. 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/AUMEV2464236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7a2bc274acf135ca85bccb158caf0ac8f970571bae0ab322d6f54475d316291. 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/AUGBT2462306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2893b7a9fd51233a6606a0d5fa0f5d96268aa0e55f058f493da98ecf06230c79. 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/US7VG2587586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef44d530091bf709f217903afe217dce335ef50eb85a81d2c11e0167ffcc5aa. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZWDW2505105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b89c8038b5c72f2c39d8468b3c0a628cd20af846bb89626d7504524d492c6b2. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZWDW2555906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a689d2b51fffb7b86e3f877d41ca461c9dfd750edf0894b9148c6a99d6ecac2. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/AUMEV2309166.