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 0x12ee0a357f1eb6643c64d689e395a6886f1db8effce4382a1db8a04bb964085d. 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/86c4b59b-fbd8-4915-b4f8-a2cbd4682ec7.json and https://artists.proofprofile.net/proofs/artist/86c4b59b-fbd8-4915-b4f8-a2cbd4682ec7.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 0x67ae5c8157eb165d591cbf224719a02b54319548b7eae05f1636d6142817104f. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCACR1680670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8b17fd95922768643253f2f1bcd548a1098fdeae2b92da697cfd9d4311c941f. 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/TCACR1680679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28136e5c9d90b3368c78219e5ab200608c21b62896d541dbeb5df8a54dfd5f81. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCACR1680692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1df5bedfaac667afe0b08908f08ed0411d3fd3951b849b6b60b153bcdad5b68e. 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/TCACR1680697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dcc3a8dbad8ed5f1da7d0fe76bfbc4908f27fcd54a1be8009b1db7d7a813ec3. 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/TCACZ1796549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49b928db0a9b43590974be03df97f22de2b606fa326c5bc8203cfeb121ad1730. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/TCACZ1796578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x569a74812860e743ca6c8b1be8ec9a3a685e8400b5745ea3b60d0306416df393. 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/TCACZ1796602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a7e8ce9ba34a2c2b8877488403d905f4db3b1500be62865c85da1db0d0a9de1. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/TCADF1775888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5249a01488790cbc6bb1412dd34617a3cc803bef386a8c31f673b9aa76b2cb83. 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/TCADF1775891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27f5c072077a7391fb3eb35b6bc9920d7f0cd673dd0b0d1343abe70829ffbd6c. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/TCADF1775887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ef407d6fa46f3fef9b8acab8dca6ea3780e47225b5e4240fee9eeaa5e2f042. 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/TCADF1775895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd93e45f1c02ef6e381dc23ff3dce7de0bdf1d465f6068abd0058c38e24b8c358. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/TCADF1775900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f70b22625059f1d49a9ceae97e67abba33cae391918b8e954f893b8d7485345. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/TCADO1852878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x022b77f6f3ebd7e75e0a932cd30f2a59d199c31ae4a08946703a36a3cf4924cb. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCADO1852891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc30581b160adf45bfe91ac2cdabab537b83c40a8e3dd6d54b60b86ce8fdb02de. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/TCADO1852908.