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 0x85fe864650768827c74f822fb4adb0a4abecb990475733fc1071ccf7a306694e. 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/eee4ef15-eca0-44bd-9b1e-06cda698069f.json and https://artists.proofprofile.net/proofs/artist/eee4ef15-eca0-44bd-9b1e-06cda698069f.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 0x42931fc0afb672c07a4309ec1b6f7f8dc198382f7e982dd1b1bbf3136865c8b4. 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/TWS651300102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c966b2d3df289daacc37fa3e45582f3b639b9d2b8f06f59ef116e12d8b86664. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/TWS651300103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f4b841fa9a937810ca630acfe7ca9179e9b8fa1d516934c2b953b4b0a1c76b5. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/TWS651300104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17898f86362ece89d3285bc027be6394a778fb89f2d0f76b151b21e2fa7f98e1. 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/TWS651300105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bcf93b54282f7eb119493766d4812094ff179b63157d7c5a35bb773084288ba. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/TWS651300107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfea3a437f2365e243ef3b4db4e036f7324a0fafeea3121113faf716701b242ef. 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/TWS651200201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ef76fab0bcc3abda18ef340f9aaf771e00032a3f0343231335e2e640fc39c6. 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/TWS651200203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec0443011baf4d53420cd18a9527c8bcbe6ae778617aa890ed5c3680fd7be7fd. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/TWS651200209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18c52b9e005efa8e76156c408759378df3266a8f725aac94f2e4a6c52a7eb1e7. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/TWAE31400052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b6c0a2504851fbe55b9d26d51977466e53c19d51122456c06b01473287fd318. 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/TWAE31400053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa97720962f320eb5aac08667013fe6d78d374f6d7aa5bf1031d21f0f3828ea. 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/TWAE31400055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0edaf728dfe8fa3d03ec4646a99f1e9518138ae9472607182aed78db5b6a3c2. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/TWAE31400058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4db8a8b5cc87fcc944f60c0de00d60855499d3ab418fc9a9eb23e181bb476dc. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/TWAE31400059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ccc9af0e98b3c2181e914e631c157095dc345d0aee08a5e0f5129ac4805bd01. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/TWAE31400061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaae840038e4dca2984d7b79a24f1e031d31c79d532c37a35b3b8871555ae90b. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/TWAE31400062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf059bc22e0d61ee3c2b65a144208c9cad9f0d6afc5baec7cb25d80216979420. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TWS651100103.