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 0x5315453c2b9405733e66077c86bba13a8e564af63e08feaeee2607706699a002. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3f91affa-901d-43e9-b074-32d6a1b23e8a.json and https://artists.proofprofile.net/proofs/artist/3f91affa-901d-43e9-b074-32d6a1b23e8a.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 0xa0ea5b7de533cbee7f80deea3be6a3597e2f9442905748d10b284880d7503215. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZGLS2078021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26fe7c473d56ed11b7833d8a23ab25c44db296fa7548df4f16372d425cd20baa. 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/USLD91730939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd2eceeb39e41bb7fed592ce47bf44ef13ccabb30eed3f90bb61427ff21e532f. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/USLD91733301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4d4d58d1780e9a8d745ff614c8307c3e163f530622faf85bab6e37c05974e48. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZJG52297871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05f0ca5710083bea75a4040355dfbee2b64a337c9e9f893908190d818901e994. 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/QMFMG2331748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaafb860135dfa7059a217e7b3c6d4b000a7709da99269ffc1200a9c4c53149ea. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QM4TW2412817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaafb860135dfa7059a217e7b3c6d4b000a7709da99269ffc1200a9c4c53149ea. 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/QM4TW2412817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0515e331eca785fc08532b74c941312d4d83804bcc5860f10711efea8e89d380. 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/QM6P42443611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf1c477c2486ef43ab08dbec51aa983f17c650f64b623124822a8ebeafd96624. 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/USEVP2200038.