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 0x4e85093680b0112a70474e699dbb85565c68ed84e815392be1817b4d9c4204eb. 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/23e7c0b8-0f9c-4ac8-8989-85a819b66541.json and https://artists.proofprofile.net/proofs/artist/23e7c0b8-0f9c-4ac8-8989-85a819b66541.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 0xaa65c01e73a870bcfd320cac454c84aa5050e4d66acc0be6343375e00f464de2. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USLVZ1100014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce64625dc077ed108e77c01f95351976cd68673d28800a8f7634be9d70236d26. 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/USLVZ1300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c72fdabfdb16c578a1b49eb462e635eaf0c3dc283562df209581a477397bb9. 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/USLVZ1300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c246b0f411c69d0cdacbee37a38fcb7bf4b9123724fbcb277ae3712958a4c96. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/USLVZ1300024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46aa6e5b832104469b5cd0d842c1ea8dadcd882fcb0040d1be6f7498dc4ae2f0. 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/USLVZ1300026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b53eaf3c40a691020351b0270b736c1f0709f2f8dc449b638145fde6420daed. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/USLVZ1300027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ccb91c8e19d7eff0c7ecb6a5b963cceca893803d90e0f160bfd705c10553d5. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/USLVZ1300029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e6e7cd4e15357a8d0084f06b21fcff7a2e6b040da039694ef94961eb0dd1e8. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/USLVZ1300030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb31673ad3f6817ee6ed1bd22dcf656b4c5fcad7d3841daeaec79ee685e7d1d79. 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/USHM81438927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf86225249f20eee57e72e6f1988e9e73d6221fdf895c3783bf84e032fbca7c00. 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/QMRDX1600011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b77aa443845e41d25a8b5d90f1d9940e780bc71609a43530fa66c8ff08e604a. 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/QMRDX1600012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f24b5f3d4927d85f1886b4baef951a19b892d3afff8e90625ff7acb27d0478d. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/QMRDX1600015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e91b55b63374cf4f8e7692389be7a3a170285e3e340131c8ba1be77aad372e. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QMRDX1600016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x056994bbb85a2efd385daf4898446519b3710dd7a6d2b0f0a1c82edf7b1a7c45. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QMRDX1600017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29548f7df5c76ca5715a172f28e776abdb3b303739e833b8467fc9efb4ee5855. 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/QMRDX1600019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc59b63b281d8885aa108e31d295448d54c257e1bf13c70f441447e7bd5d7939. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/US2762093541.