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 0xc4bfe942ab637ef221c21d690503c334e773ea07a87bdfbf94ef33914d474434. 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/415bfeb6-7a22-4f6b-97ab-d3bfc0288207.json and https://artists.proofprofile.net/proofs/artist/415bfeb6-7a22-4f6b-97ab-d3bfc0288207.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 0x9ab4bc631118d72f4086edd100d4f3f29941bacbd1855c17b1406c9b92bc773c. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/QM4DW1872365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2e5ca6bdff555b72319d7ebccc84b3fadf9179e28bc9c97c4fe3f8b3005459. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/QM4DW1885071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ac9043ac5d6141c6f5faff7019657c053a6e24a9da935e04e25013799ef12c0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZCE61872675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0fb0b1749c8ef13a60bbee6017e4f6ad47a3105ac2fde4ca29b654bf542122e. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/QZCE61872676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cf763810342488eb1d158addb5353ea27320471dec5d9f302114fd4c4526a00. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZCE61872677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54e6ac27feba5355daf32286e7a674f22b767ae2079477d51f04346e1940cbce. 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/QZCE61872678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcd920e10aa25d1df114ac4d7b0078b6f5f74c3cffaf6428ad9ead1565e2e069. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZCE61872680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21ad46fb76fed222e2784a357032a611543c70d5f16a5203bdd7d33501a8d914. 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/QZCE61872682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c8d6242ba43a4732f82c8642da7e4289e979050fe83435d2185dbf8314d87cb. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZCE61872683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb731cd6f725ce2329e9bc58e140c588b7873857afa81f58db7d4a571cc1f3a1d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZCE61872684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf851f7a3cc023c0253bb94d9882cbc9db54fd1cf8f34ac1d245a1369c90b2a17. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZCE61872685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59eb852b7f08516a52ef8dfef3cfc07eac90ac1cd14bfadc9cfc41a255d4ffde. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZCE61872686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54e6ac27feba5355daf32286e7a674f22b767ae2079477d51f04346e1940cbce. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZCE61872678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c3dc556e14d167028d81a8e7e347655efb7fe7f0ca5b07fdb3b18a954ead50. 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/QZDA41817340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b9811b00ee2c048f678585cc95da2497aa1c768fbc8cf3f29d1b95b1f366fe. 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/QMPKX1894959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc49e01c2e16996a36c30aaeeae162ea3273dbf5ed1e413d1d5fc08ecd911026d. 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/USANG2076505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c5333b36852012c4db65ae7b8c7940ac2ce4f62d6d4e878ee88008c0ccfae6. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/USANG2076508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e8dc4de3cb393f156aea07294a31d75f162d47b8901d0fd398ab57199392108. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZHNA2046855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb6a41a7e790202b3bebe74acb9cef48b6d5e167c8f59aed19d5c6602d76b2b5. 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/QZDA82121133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26503d52417d13e3431b6d60e560574ddbe60bb6f8e668dc7863563852055bbf. 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/QM4DW1872363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed82335c02d5dea3f97516ead29ef5a15b0f171ec02815d947cf968ad443771b. 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/QZGLM2314224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ecd47d4e2c369e064ae71d6213ef33621ffd5ee6c5f6169005f3d4fa1442e5c. 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/QZNJZ2351251.