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 0xe5a2dc731fc2957ecf3cd01362b3e2f77705b2486d7043efc0639e1df8f49f25. 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/e81fc966-f1e8-4a93-94fc-6ed692059c08.json and https://artists.proofprofile.net/proofs/artist/e81fc966-f1e8-4a93-94fc-6ed692059c08.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 0x60325126a0821d8fedbb8a8751fa42bdfee106cc4ef5da6bf4362df16cef3817. 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/HRA8C2200027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9183374ef1ac91cc51b5378ad48f7a6a33356c59cc4e7c3b8967db1ebe01cac7. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/HRA8C2200028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc578b3713490a794110e3a420277ae1dbea4acb26d507680930393a5fd54ca81. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/HRA8C2200030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c43d358b5370e36c1b0a1b69674508d5f174cc177011b25b1ceda4bc01ca5a6. 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/HRA8C2200031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bd8f0d486b0b878a4e5c66779e5d0ad8688d3fda74c508fbffae42f6b65cdc6. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/HRA8C2200075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ad3a81f08b8ab7424f96b6f141f508c03ae8ceffc989238ea371d46ea0ee981. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/HRA8C2200076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2774f6e5690745b9441ceddfefae0f8dbd7a83ab0aa7593b27385d91611c8c8e. 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/HRA8C2200077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f798fa8453e2591f164b8d6f437f5cbf06ccfb47852ebb78026b8d6d1ef87d8. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/HRA8C2200080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45797981b6038f153c9e55f467c569a34dda06b4802c35064852daa7fc0e72d6. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/HRA8C2200081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4805c8d8d240536a34b98927f01f80e81d5845012e19a1b48cc7547248a6941e. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/HRA8C2200082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bdfd3d2f6b4e7cb5d89cbe67d422205cae8f3c6b8692d16b6afbb47d898f266. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/HRA8C2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa0f749760ca6a440c182bab0dbc3c47b0a087b7159af5620bf2a6e16f050529. 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/HRA8C2400244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6699e964b8e192e42e9afbc452dcccb7db136baa15ce28935bdab3f34be310b. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/HRA8C2400247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3725e0e66b9e0269dee8ec90c17dee99dfb5c7593200b4761c0837d987c46378. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/HRA8C2400248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc439e7e0ddfddfef3f7508542e1a9376b443fafeb07dfcb43065e42e05dbe216. 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/HRA8C2400267.