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 0x97b4c4ac7122cdf52eebd51e6d7bf4985a6a1b93741a12d01e041baad2f93ca7. 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/97738b10-f05a-46e8-ad15-d72f63ca5dcd.json and https://artists.proofprofile.net/proofs/artist/97738b10-f05a-46e8-ad15-d72f63ca5dcd.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 0x17944ccbaa144553083dd0c3fa572cc4df2793d3e7c10b972a751d7556585c27. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZK6M2322129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c6a009b44a793f7c7636eee9eee2a3937b0fe31889d4165d622b93e213c9a21. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZK6F2329718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9def9b81209b3385c9c68163f0eddfb9aa5a239fa1e548153779e7ad05f8a17. 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/QZK6F2329719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x369787ca27de3e7706efaa815c5dd8613714858c02754feb1aef69ff95cd9c2f. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZK6F2329720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceafeead2c413e5a60be147f8aa799fd3e11c4d8ec5e8b41515bb4cc1470a0fc. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZK6F2329721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x349facc5ebf2710cc86fac9edd4e7567e5c51ba59e894ac1b97c11a53bb90e92. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZK6F2329722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x240e268762d1c8ea86bf9a0d5f91071195d3fb0d6b456ec3cc19b675049c4dd7. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZK6F2329723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe66dcdd0c48537c71f3f33fbde47f6704e1835c314a050f7ff1d4ead0e4a3375. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QZK6F2329724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80b32042fbe129197b9714f007005238c079ebce62ec3cd213e0e2ec48faf636. 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/QZMHN2273755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f6acb71b5b083dbd28ecb95abedb465366d0043c8ee85efae94731ee6b2ff23. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZFYZ2412229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccc14066a9da15eebc24b79221fa7604fc37d71ed3013451290554c31d6682f8. 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/QZK6J2473870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3ddc2724ce4a4060a257ea50d796ecbda8c57564355603fc46200b9d3ff456. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZK6J2473871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c75dec20b69d46163486b9998c0ccb34dff170dbec3b6496e221909fbc2b9e8. 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/QZWFE2331544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc20b37a1e6fc0eb30be286cefeb3e61d08d98ff3d1d70500490ff22ea1c2ba8. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZK6J2473872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab97c5316c9c5ff8bbf1398b3143d7e047f20781ef383ecdc79010571e1357a1. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZES92460819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc73cf083a8c9754929014494b47a84dcf1bd0158af10191d190a5bdbff09602f. 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/QZTAW2355406.