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 0x302f28e44f54e01101f4a40bbd2dd58b670df72057c0919717c5d084273f48b3. 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/f2211eb0-7778-40d7-bdb8-cfc3f5be3971.json and https://artists.proofprofile.net/proofs/artist/f2211eb0-7778-40d7-bdb8-cfc3f5be3971.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 0x5abd49c900d6274ffd5d828a3ce36bf48e56c6a78e9956934aef055855f7b1f3. 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/QM4TX2483679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd276d5bb02c7f45edb819301dba88c94237d82bf79691c4abdad15f42b5d00. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USLD91756245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522a02d6ec918b255baef425dd9d6b84fafaf56c326bab1c4787515d947f64c6. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR10S2431404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf03683b5e3ad7a82bc1e985862183a0264c3cf6b4593f9244c2bc0b5100de001. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMFMF2310207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x651866b24c858379a8b44e09646ba24a5958301602d224e0ae83f1410d19b7e5. 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/QZTVM2371876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb34c5c0edeaa57068962609bb26c6d27c9a46a4eedf512f345d287e890de75c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USLD91751630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dd0489ab6599cdb1048b72b4a6fb529c557477dd41e2ed198e64d0cc09bb156. 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/QMBZ92354621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c5377a3bfe97e0b3cc658ef87f29460d5e7a21ae6830a2778741ff09b1b3067. 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/QM6P42387920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf17b7c817e3a77b468be27b0cd9f715278ca52e8130e63224f9a85555a97135. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QM6MZ2332929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49b2a7b042572e81e8db36e342d33aa9de04c30ccbd1335324fe3052771057d3. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QM4TW2323004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66555cafe1dbae983f999633a3577d982fa43f45d7cbbf65fd40e94a9386b227. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/QMFMF2200096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c675fc967313bdd129ffa173502e130e7690317368d770d35fa83bc0ccc80a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QMDA72298147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1776c4c3cec90c46e185e8c58ae99e2955bc72527f4bd8ac96818d8e7bd93e02. 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/QMDA62299385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b1e3d989596925dd85c1ddb776b8d8e58880e1a91df617c669d79b2d5c7142. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMDA62243273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c675fc967313bdd129ffa173502e130e7690317368d770d35fa83bc0ccc80a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMDA72298147.