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 0xddb33208de88113cd1b5c7d70c8d5601cda9c95e64757f86418945e13c145c10. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7718eb27-7e81-44cc-90c7-0ba9c3550f8a.json and https://artists.proofprofile.net/proofs/artist/7718eb27-7e81-44cc-90c7-0ba9c3550f8a.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 0xde3c93fff808fa44654e851e4b3d0dc0b73b5c6013fd2ce254b849ca3da1db8a. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QT2VB2458722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe209a7bff886384ac126de7ea39a0f193f0089fa3465cde986a93657e8febd01. 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/QT2VB2458723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca9ad6ca2997aa51eaf0cb503731d44c265ee88072845ed1e3cd8eff03495d5. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QT2VB2458725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd9f40e17fd871ee9ae90b7b1e522f6884cd61df8f9fbfd8b719d4cced14ee1b. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QT2VB2458728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2345a41bd389120dfc514f09e13686793fece02e7ddb0ccc8c0926d94ee51f4. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/QT2VB2458731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb862bec7e2c221f55245ba72df6df9bb42d5b94dfa49550a1e30d680625dac79. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QT2VB2458735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a46857952ef7597fbb375a6f416d3b2a380475810c7fdf612c05ad28177244. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QT2VB2458737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a9fe6e6b371969e3c37d5f303961124931472d72c7756a560f45cf5c16f176. 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/QT2VB2458738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4862e40cf97d2a68d67aed2c4a2687c958e1bfab2fb33bf47fa3e297016eb1f8. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QT2VB2458741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e7a1794d8830847a80a41333a2909a9a5da07da24db28e06ff7ed148f772165. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZPEW2509796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7625298d04be8d9340de59b15f96537a3da259f267172ef4ef1a87c36cbfce3. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZPEW2509800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d7e41d3b8dfb6960300503aa848ab8956d12b7d18abf7a813aa6a82fa228dc. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZPEW2509804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34186da15cfc16326e783d8aba5354a24b2b39f6c8b2748fc986fdc903c4fa3a. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QZPEW2509806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee65a97679128dfc0865773095d6066cf4447e2585b8e9183414cdd0e3718adf. 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/QT4K32590321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb86f5b7ea76d6363a22136134ca1274518cc60ead038f8b7be7a94d6f3e2b8ee. 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/QZDA62528523.