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 0x29f0a23b51690965bef54c37c7109269f6acea942ba59debaa7f807c44a7a5e3. 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/313a9ade-6ee5-46af-ad9d-016e06a9d171.json and https://artists.proofprofile.net/proofs/artist/313a9ade-6ee5-46af-ad9d-016e06a9d171.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 0xcf9cec3cefc291fc65ce394dce4353b8782cc9556315f1ed9ab636ea19a5d5b5. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/QZNWY2231982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62427befa8b28b2500a9fd9d8c582659f54547dc462983e4d6f6892c0bba440e. 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/QZNWW2335427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0479badd68407ab91e609914f32b4af33fd160106b89cd71837f479928a9e08. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZTAS2335536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c20fe21403ffeedd9f9a70d71108b2646678dbc6e742b33d75c735493635859. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZTAT2343163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5db0d0a8b9acc369da8a0427f2529d56a019aa618e8c172a2b8c7237dc12c8c7. Chain 2 (Bitcoin): anchored in block 957573 (2026-07-11T13:43:13Z), 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/QZTB42326787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f1d102a4b23da4549864ac9c671ef8a4c5194d3fcbe344ce497b58aad93c80. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZTBD2321000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed029a142d258ce8bfbc1c4a61f719a205fde4a493ccd044d854735c0c9a2cf. 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/QZWFK2334192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fb2d100b677d6eed23976c59717e813638ff3e00ab5f5a278140ffe3b2f7cf5. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZFZ32442434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8066a005879132ce1eeeca0781ddd3fba536c238a289cb41b9e582c9c29269. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/QZDA42460041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffafa511c642c2aa7e34fab36489bc5c9fe4d38bfdb86706ebb1ecdf932c6f2c. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T00:35:28Z), 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/QZES62432092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9167ee999146715988a96304daa152afe9c3a5227565e10baeb9dd54188b2dd5. 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/QZES92494214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89f288fbd3313caef970371ba25e10858a5383d2d27ff6bc33f8a614497ab213. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZHN62494767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad78913e248fd6f7fd166675bf8aa873b1adc883a54297ff09277cc71c1a5a9b. 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/QZHN92463279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3c6f926220bb5e2b3d0803f47957f7cf927ae0550745a2af3645ff61a6b70dc. 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/QZK6Q2492705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd69fefbb0cd75982e51cbcedee4d2792ad4ad7e9d8fc0458c0394c35c0630491. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZK6G2414592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70afdba1fceab07285dd391f5acc047ef1692915c3b68668bf2377e70ec231d1. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZMEN2483124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb37ebd05ee831b4827ab9e3e31738b5356f9c4d327a0a5314d98efaeca16b5. 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/QZNWX2457032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x481f08d89eb116c75116d1c0c55a03b59759ac9d048f00d3be36153fbda56177. Chain 2 (Bitcoin): anchored in block 958752 (2026-07-19T16:00:28Z), 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/QZRP42481889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9fd52f1934bad68b5785a49722d2b64ee93d9df33f73e6e57ac7457c713d874. Chain 2 (Bitcoin): anchored in block 957569 (2026-07-11T12:44:25Z), 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/QZTBC2491560.