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 0x655e25543f4877ebb6e0790cd7634b585e5517c75598599741197b15a10855f8. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/274d6312-2c76-4ba2-abe1-dee4fe6d2a87.json and https://artists.proofprofile.net/proofs/artist/274d6312-2c76-4ba2-abe1-dee4fe6d2a87.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 0x63fa3673df4333fffbaa9f8c9f65f8f5acf4770b3321d2bde3d3abd8f19f8092. 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/NOFGH2463010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1bf6f1eb4924b65ed7366709fc7038375cd582ef87d1cd85ae49d7e134a5d8. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/NOFGH2463020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9ae0d9a8219f17c64c5b7db9059d18afd885839cd4aceaa2c6c01c5c536d23. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NOFGH2463030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x988e26a125a2054448ddcc55d70ca14aa498fe910d18308b8bee79da71d7c09b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NOFGH2463040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed6cf4b414ed37f85af793e24de797d2a47766e637547f35280c581261926d8. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/NOFGH2463050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fab6c20c869d9f7dfae5fc78d3c02eb6ebb7e55923c0a4747f0c8af75dddb7e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NOFGH2463070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cb1f90be113174e5187976dab0c5a11e8902a6e1b0fa19baea14783b85d982d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NOFGH2249010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbad49c100a48f97e26ce843756dcbffd88aa5c41ed6efd1522aa140ddaa0dbff. 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/NOFGH2249020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48b3bd47164c1a25e4a689df5d62fbf3d7185eb595d5c6f1608a55d8b5483db7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NOFGH2249030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c99694ade1f21cc108176587f8dee11b04f50bed8d3df36c167811be641c2af. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NOFGH1888010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b3fe4ba0e31af87bd2411d18e7e49b9579ec5478a2d267e3ca0fd835488db7. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/NOFGH1888020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0300b5577cce8c10df022d7ecfba377a1aa354fc6997559a9405c69c162a86c. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/NOFGH1435010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffdb934cfb19bff6ff853fa46ca428c2a6416c53fdf4f93fe9f85e00bb9aa2e8. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/NOFGH1435020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbad49c100a48f97e26ce843756dcbffd88aa5c41ed6efd1522aa140ddaa0dbff. 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/NOFGH2249020.