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 0x0441cedf99db72c73477486f5f65e6dbc3442984e35aebf3608be752ae61ebb9. 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/56aa6ade-c5be-49d6-b402-51e2b24f38fa.json and https://artists.proofprofile.net/proofs/artist/56aa6ade-c5be-49d6-b402-51e2b24f38fa.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 0x4874702815fd6b8ec0cb41fb012b6a60a14cdfa84b6a02c62aaf134fd91f192a. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/NOLEH1908040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb099d2b4143344d583c51f4ec54f7e7738bbd5d8b628b92f8f92098305c34742. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NOLEH1908050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94889bfb6bf785aa6778208af9982cb0cbf07819bffc7a2cdbf842d7b06f738b. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/NOLEH2004010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b2f38062e86c87ccb9aee1134a793fe7a8a2e0bfc470c152a551a1363d706a. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/NORN72100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec95bcdfa5e31b12735bff8ddc122fb3ea8a9299c1d0c985dc93d22d9f2a4221. 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/NOW562200031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x469d532d755e90ada7407a6ee6cf58f16bb30922e2a677c630f9d859f709d0f9. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/NOW562300028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ec0e1da3747b183400548871f03ca80b3e15e4d43f9da28ee180d4c8230386. 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/NOW562300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x300fc065b35bf98ab30b0be5311eb2d1d12d5eaa82358d90d3fd6132aed61592. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/NO2DY2400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x300fc065b35bf98ab30b0be5311eb2d1d12d5eaa82358d90d3fd6132aed61592. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/NO2DY2400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bc67ab82f3dd5c76bd6ae719d21966e33f0614eafeeb8bba6638924f810ffc2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NO2DY2400123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe49e70d0dcb4b30ce9df5c5ac35f5a2f086ab6f53a088ea11aff8886e793bef3. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/NO2DY2400125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69ecbe9b8328888ff7d0fc8cbd4cc520019a84d61087642f462ca41d14992341. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/NO2DY2400045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e1374be7c3353d5792f9a007d8fbe464913148513f23eb59480b59d26dfa5fb. 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/NOHLX1987050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x472d742c8814aa8e4b7f0981421954af1daf992d50c2d30624f0b83897d37da6. 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/NOLEH1905010.