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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9aaeb755daec44c34b72c0340d52cafbd5ff56aa1fa051666315865401b3ec1. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4c991c15-528f-4cfe-bde3-7200812b3780.json and https://artists.proofprofile.net/proofs/artist/4c991c15-528f-4cfe-bde3-7200812b3780.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91abb6a9125aa49c73bf73a0aa09bf029f1b19ad2ae665e2f64b7b85522696dd. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/TCADI1712252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d198aa62ee65701086ec4c612367bae45ba0fca344c1741b81d076eaabbaae8. 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/TCADI1712273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x367b173e9e1d809f40fe7611ef191ddd7ffc8a88445bbdca5e41835af76f3cb2. 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/TCAFE2024872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cbc69545af59db0c65a14ee389fd96209163f594faa6186847a74895ed46e6f. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/TCAFQ2186751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbed9a7e80dfe6dacd71c0873f9d1519db715272bf3dcd56fb1810a12bff560d. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/TCAFQ2186745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a0694b413a102916d8bf3fbc880621731584c45f7e57951672449137f0318e1. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-20T00:09:15Z), 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/TCAFZ2268825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1b766b47a29fd611c9af5f1d32d9d4b7ef59c0641e9dd56d476e85e3a2b3c0f. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/TCAHF2330790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfef255e4822ffa89b4bd2ba0cd94f4f4f1814a77e3a195844cddd1bc7196851. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/TCAIQ2431655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeef4bb28c61ef1c1b2e5d8cadd0fb54b29505defd840478b6597288fca20527. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-20T01:39:58Z), 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/TCAIQ2404708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6258a1b8d5f823d883ef436b34133ff49f9b4d0f867edbea11b219adaaf1c20. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/FR4EO1400038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8eba7b3c6d326951c1d0c0394fc4bca9a4eec9ecccf200aa8648dab34e6b7e5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FRP7S1800100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38c0333f0b9803583179cda6b4ca82428a8b1e7012e0b442faf48fa8c5eef794. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/FRP7S1800220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6258a1b8d5f823d883ef436b34133ff49f9b4d0f867edbea11b219adaaf1c20. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FR4EO1400038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x796e5f28a63b1a21b52954b59be8055a9095a06e6900aaad39046614f76470a7. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEUM71501573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x982f1753eda9a4ca4aaadabc502ef27029e9b2704e422f05539257d400edc104. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FRP7S1600310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98dfa758f41161b23899bb9ce6b21ad942db71f4e775a8564b8bec6610cf695a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEA621400207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc931d7db11ba9c93ab659d76ef65e46b3df2be30eed195616874397a49087855. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/FR4EO1400087.
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