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 0x0abe7333ce75108ea38a6182d102b5e0540572fd75830616128c8a6c65d06ce9. 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/bd5cc425-e11a-443c-b808-def2a0678159.json and https://artists.proofprofile.net/proofs/artist/bd5cc425-e11a-443c-b808-def2a0678159.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 0xabbf263140d38fa569de3a1b56c3d49f4401b9ec2e2c9eff535dfa9cf5223aa4. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZDA72337782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc654fcf223f65a74606c55c4bd66dcd41e071d36f59877f730a8dba921752544. 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/QZDA72337783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62d271de481542bfd0bf54c5818da5a0c8fc553f49761a0a1f8cc4c8a0b8df24. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QZDA72337785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa74fd27bb59e546a613e4f86498ca25a605a446c54c9c78ce6b4dc91c30d0b7. 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/QZDA72337786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3f6d0428bf761ea01e3557cf6803eb3224b93b2158859744294fa4908915cf9. 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/QZDA72337787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb96c68ea9189a86360b8b0293716c96ec3efdc762b7fac8bc5ed41fe8d26d3fe. 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/QZDA72337788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb473ef39ac440e4b1ff8ad0b8e2561d29777af1c2154cd53c6d435b25120c7e0. 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/QZDA72337789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b9f777612141c3eb5d6ab28c6a9dbaac28b7e2d63ec1ac6299fe411e92e98ef. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZDA72337791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x212bce71375364023d4e2daf50e5eadac9bf50d8d2f2536a752e1a54e1b0bba0. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZNMV2412726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x212bce71375364023d4e2daf50e5eadac9bf50d8d2f2536a752e1a54e1b0bba0. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZNMV2412726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e407e5e33b8549b6051e8637b5a1de25e1b5fc923cf3d49f9892bffd6612b6. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZNMT2494304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91909978e7e08483ee3b9998e80cd833da0a3703a73d8eb5c578628481f8210. 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/QZNMY2410230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15003e6510b69183a007d7d15e277f365559073901dfdc73ca2255c68a5bcbf0. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZNWP2451393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e407e5e33b8549b6051e8637b5a1de25e1b5fc923cf3d49f9892bffd6612b6. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZNMT2494304.