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 0xb26416d8c667d441cf4b4fe84a93493e12d244c4323412f97ff6561842fda200. 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/89932f5f-7b23-4d8b-a4e6-b42e36edd204.json and https://artists.proofprofile.net/proofs/artist/89932f5f-7b23-4d8b-a4e6-b42e36edd204.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 0xf93ad2101ab833fc9d2b3619502149bea30a1e91893620ded4896a907f992f73. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/PLC061101107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ba4a6a7e4e64ed16d4b95c5a07064a1626658db28f0cd1cec306e80a10822b3. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/PLC061101115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5708878d18cad7830f2d873034e6159307de367c97925242b53716daecc219fa. 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/PLF671401412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d3f74d6342d9b617684a5d55ac5467b8c8205577a0a890ed83ac6f5dfc407aa. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/PLF671401401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89b447cf8b2392c5600cb90645bd9df838086c1e54183003a9b5d88640479f4d. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/PLF671401402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe021bc3d22041df3372ccb47d07248cd044750b6eefcbb1c75b418650c632c92. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/PLF671401403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6510155ee2bf08bd0cd1aec09ea27745a36703e6a98c962e8ed54ee4904df8fe. 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/PLF671401404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a42139fc3d99b549dcdf9c2d6edca9562cdc9d4dd84747dc84a59f32398d02. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/PLF671401406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9272a943dac63f12de7f4a4748f7b59febc10e1f502d4265ebb2154cb5f94886. 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/PLF671400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c9381c1448b871e4103670c98be183c40e70eba47ae3aeb4ab2bdc1358cd3a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/PLF671401408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9081ecc9c692ccaf59d67d1a164ff9b79821e5f1296c68d9285c2e87b23491d0. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/PLF671401409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x867f1dc477fca93c135b359c4bc2c8c84b69e40da7894bed335b214654a1337a. 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/PLF671401410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd17dbb304aaf198fdbed611cab85a2056f113213649559fc13780f3a0d07809f. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/PLF671401411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3073c6dd6bd648bc50fe0aaa214cd9942013ce3fe6686ed63bb2c61c26a6b939. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/PLF671401413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc60945e131d7dc88240b8d8ea34486458b348ac9a99f2777b924d08bdf0931f. 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/PLF671401414.