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 0x7369322e02d5dc44bd21333cbbf43b958d55db39c1eae83d6e7d290b025be56e. 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/1fc2037e-7321-4a2b-94fa-0e48e2647af8.json and https://artists.proofprofile.net/proofs/artist/1fc2037e-7321-4a2b-94fa-0e48e2647af8.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 0x650cb3eac75bb04b3ef9ef13a36a79a17c393b75dd65172e16ee2dc4ab144f56. 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/US7CV1700004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a7fc708c58bd8d950cece0f668f55eefee1ed2b2193a7a20435ff44f4b688a. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/US7CV2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a7696bd744b4a06403e9120047266bb1d0d723308e65b7d605e4be6ee0059f. 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/US7CV2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a7696bd744b4a06403e9120047266bb1d0d723308e65b7d605e4be6ee0059f. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/US7CV2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a01058719c3114249aba75c93d9921b7ee1d80b80c3eda6d6f182a233b38dd4. 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/US7CV2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x938d17247637e1155fc9b28b589cca557643649c0681a6b5b64372ab2f5504d2. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/US7CV2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe15bec8638b1143735c3ff85c4fde78c5cfda21753f1c968499962aaba762013. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/US7CV2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x970941ac03956a7003a408eaf6f191c9ac2980b8f1b63166436f4da873110586. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/US7CV2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9e9eb3544a7b440a99dcccc2d16e281937a9020700009f8a11d90f89d72addb. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/US7CV2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b1c0e312c679913ff4d3de9bbd54fad56b92848a75b479a19160608ba4cfc1. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/US7CV2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe13bb2a470067b26ff4641163fb8bd627c9104d771a9b5c768b9e1935f116de. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/US7CV2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd515c6851b7ff18b2cbba52833e6e64234fb9b1de82bb6afc7f7081a889bfca. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/US7CV2500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x139aace6444894d0e20ae86159013271bf919d50fe83adcde56f4ff545a382fe. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/US7CV2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d0f8f1c3b44960b69c20c7f014767898e6c9a39274500e252ecc306f1f1c63f. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/US7CV2500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c9a0fc3e5a12548e133759d370f2d862e13b563584495733d49172a28020ff. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/US7CV2500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557a6d2391a905d434a211e7c0e285e3ff191d5450dc8845d332335d4e03fd27. Chain 2 (Bitcoin): anchored in block 958863 (2026-07-20T10:27:46Z), 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/US7CV2500009.