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 0x5706e36da38849533b4dfcff3b1841d17ef7820b6f84b2c0192e01c1707e37fb. 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/fb508ca3-28bd-4069-bde4-dc241c374b4f.json and https://artists.proofprofile.net/proofs/artist/fb508ca3-28bd-4069-bde4-dc241c374b4f.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 0xe0696d26000d341e992bb4f39db31b62e5379fad83ef46c78ffb51c4f95b9fcd. 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/QZDQH2378399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed49888d297ee32c967ffbddade4ec5cd9d944d934a9660528e124646313063. 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/QZDQH2418727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52b76586dd97dbfdb08a14113389395c86a8edec70a6acfd0b3809e9fac47893. 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/QZDQH2418731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5872d627608573729763c6b283b88315ea8979a244d67705d38cbc2a1224905. 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/QZDQH2430336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91dba4439f43fa704eaeff29a9db43bbbd0886ac9c44d605da06b24075893051. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZDQH2430339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9ac91c681f8243772e75b0545d0b93eac25b4a7c64297282a9a49ac714484e4. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QZDQH2430340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be4503b23e69a7cfd6dee84355815e09dfeb44b4484ef97a50f9d1b638470f4. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZDQH2430341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44c5a3e4fcc269d66a768ef67af2721c1aa41a9d53bcac955a1f3bb075d2692e. 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/QZDQH2435659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c5651425c6542faea318a47c9ef3bcc85d14a0888a8640aaa0ab59f3ba2a3d. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZDQH2444127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eeb94f007f2761424aef3128f365ad9824a53fdd659c33329ff0b5269f867b1. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/QZDQH2444128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f6ab490031324215ff4ad39568aa36fadc84173cccae96d2cc209d2da6821a. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZDQH2509683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9992cb61b89e45bc105ff77e9e9380793f423eb1ebdddc18dbbd44f947c9b6e1. 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/QZDQH2536302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc07fe96c3cb6c37af13afb9742a82bf77098b82fa834a3a316f2ad822e75e76b. 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/QZDQH2536303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x920370bb403f86ff9fb66934281e0dd5b8b0be427a64ad8eae55518d7d5df7e9. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZDQH2536307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1c7ea0de675329f91bed04488f7da9107817e148d856e27586ae4426e892c9. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZDQH2536308.