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 0x96902586ac9c30dc87a12b9487bc87c2d767b78914c88dd7e8306c560e511b0c. 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/0cdc7319-c347-4747-81b9-d73fe23d4f74.json and https://artists.proofprofile.net/proofs/artist/0cdc7319-c347-4747-81b9-d73fe23d4f74.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 0xe7335a2b619ece8eec8ab4531798057ad16edb7c3524851ecbc8f10cc9275968. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZA4A1700043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f96bac4dfa466a69da235ef63d400f602cfa8d4716b71af6f713fe3d8c8676. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/TCAEI1916229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x960e89167fcc64fe108d1f41fd351fbdadf4d0a31b1dd344dc029246e338767d. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/TCAEI1917661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3945e1e07b2c1db4e2cd2c6e4f3606cc8829e13b0871ecf7525129cae6ae0572. 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/TCAEQ2053734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9805a9cddf037da0ebe11cd2bfad5d3c899c4f869e3711e9d38b19911ce6b57b. 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/QZHPJ1906018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1eb83b86fa2ba8ff8a62d52b5eeed8997664f3f3a8c9cabe3f72562072f09b. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/USUYG1331111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa982a0695c67d52c47c0258d23fad8785676ab360d752b35a5fdee6f02abe7d8. 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/TCAFM2120063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2dc447396c055e7d792858e5d76fb7cb971b4b675d405b77234498bc165bb5a. 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/USUYG1374401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac130df36bdc94eddadc1801b10f9f11a47b91728ad16bf9cf575596509a34f. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/TCAHS2326220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d1dfea1037e6929150071dd1346c87d7aefcc4456653e60a17a0719ae5e9009. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/TCAHS2326257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec70e2e8911386ddda9cffe2fd17fcc8f5942c949730a83ce2c9e1587450157a. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/TCAHU2409553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x239e739213cbee1d69f2d6030e426645a86101fc689a144bc80b2b95f06b24ea. 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/TCAHU2409571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd69054e5d94f2c6aa28a670ce222bde7258be977d1fd7b2a9225dc81306aec83. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/TCAHU2409574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a1b11e036714ae258ea925e204aee133f29f4f8d17643d341fa8ba4e0faa86. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/USUYG1599108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d315ed2ca574392a0858e73b441df60c13f374ec312e08b9ef14c7f6579fdf. 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/USUYG1717839.