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 0xd7b19786fbc4e23eb0a8c8bb15b9df57bd190ae94742b0c93db01096ce1ea46f. 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/05c1f6b9-c44b-42c3-a328-1d379ca45d48.json and https://artists.proofprofile.net/proofs/artist/05c1f6b9-c44b-42c3-a328-1d379ca45d48.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 0x6d5bacd2be0734e2779cf41cd32e748c91a49d89d7c54c1baf12b8b6a042c5b5. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:34:30Z), 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/QZK6J2005648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a7eedacf8e2ab651170d10b24d5a96ace3512cb45bfa9f3eb7ed195d3f5ca0. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZFYZ2195492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf95eef9bfac19745896c53966efb0d531c8cacfa78ada169a02c389996ad457f. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T12:34:11Z), 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/US3DF2116856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b47c3299a5f7788795b1255304951769eda3118f587cf69d0d83582a7a8c0e0. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/FRIDO2113204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7717a3e665bec43b3d90eff0de69cf9548d01c5c4f803e0b2f8c9889ce89f03f. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/USANG2218002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a7f4f0bcb918b35a757fa6d27ee6b9d8c11f6086918b921e1255796f002401d. 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/USANG2226287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d3b1cb6485aca3e71e9ce5f6726cbd4651775329351f5c6df4a58e49817263c. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:28:49Z), 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/QMANG2412267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11fc635b44c5d6b66f4ff2033252e3760b2d4ec035eb921441943fa99ec0e126. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/US3DF2435812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b6df3c519b5b35e3e8cbfc233e072a0815c4b4f45a0dbba510536b35e4ba68. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/US3DF2435815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f312cbbad477e56b084c8205ca5b1389ec5f9d81162e88d856a58f70f433aa4. 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/US3DF2435816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bd342d3a834c5a7ae68941f00097d745910a36542569203c27e1cbe9db78478. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/US3DF2459976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60d99457aba0399664faf000358b4ce39a18e4f7a8aaa863a9a6078b04a06218. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/US3DF2476340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb375b9192b1816b51f8497ed45dc38ceb66effb78adb16759d59d663e94f4ea2. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/USANG2440775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10e95a27b47216cc4875128e500ceae399e64491a62a58bf522177b95864e3e7. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/US3DF2546862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf116d7304250495296dce3bb92045a9ef2a3b34f6c879217e62cc5121bcb2fea. 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/USANG2520770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07066d49c0625425b2c2564bb48c920b5ac54a2256b652b0ff1fb43c9ad96bb5. 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/QM3DF2293547.