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 0x81450e9144739fc2f0760d527ed6a7fb577611fcb4197bc49f3c6d0d1693751b. Chain 2 (Bitcoin): anchored in block 953599 (2026-06-14T06:43:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0dd0d69a-f35d-4fde-81ed-8c94d69f04dd.json and https://artists.proofprofile.net/proofs/artist/0dd0d69a-f35d-4fde-81ed-8c94d69f04dd.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 0xedcef5b5e69ea75ec18c1575d5beadb0388dda9ede8ac2d0d9404920318967af. 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/USCGH1702926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42ab3909239f033601a7b90494cf48c1d493b5836f6a40a4791081fdaa3eb6f2. 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/USCGH1702927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659c3c7262a1a16048dead118cd22604469534ff0d7f8c2d30026bd935b7cdae. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/USCGH1702928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c2384647836e8efb7137deec3af8bdf9b74ef6b64d830ba9683b29792cf27ca. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/USCGH1702929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57642e15261f2551d4af59ffe776154b30ae01aeeb6e1661795baf289e1ea91d. 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/USCGH1702930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30fed3ae32634eaf2aa1ecc0daab1cbf70b9b5267b2eac2f7d9d51caefb4f372. 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/USCGH1702933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76037d7826c025dddd754dcd84b2b309f29759c9655308a9ccf2d1235380dc4c. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/USCGH1702934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31683d74fd3986e7bb10d5c7d408dda8db29da93b54ab544dbe31196146c2157. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/USCGH1702935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5e34c4d720c99249e124654caa9c0d8d8c3fbd377f01413661780c9c13b1459. 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/USHM91622766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeaf214c65cc5bd8ed18f4aa613734590740c0e53ea0839a698a2921b7acf2d8. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/USHM91622767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x959f0b61d44af3671b33cd24263296e813edaa12358f6b5ddff2933d7c6564d2. 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/USHM91622768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93bc1d2b09f99a441180a86e400d8dbc834bc6f84ce0d07e880f0862decd085f. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/USHM91622769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3b1140990cd806f6b86491ee0ec0e51d900881f8f4e8248fc112a0c8ca9b628. 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/USHM91622770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d45e68259ccfa47e2e9c6a8da5eeeeb6d678813671836244ed8acb061e5c2c4. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USHM91622771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfde0edd341048304f4b2bd60f7457fff356cc9f07ff735013331bb8f942d85f. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/USHM91622773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf3011e6b24880132f42079406b199a2ba35ca3daadc19118dc5d379720881f8. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/USHM91622774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40f48d80bc41f43a9cebf119d6503c550a55d6644df2581261d8d1377aae44b8. 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/USHM91622775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0621497900eb2589b1392d54c778e5fe1bbf4ed16960cb2e2630bfb442620b30. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/USHM91622776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83ea898a22bfaff84141fac5e2e02a5e09d6c2ff84322e29909be46a4a06e3e0. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/USHM21891855.