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 0xeb56ddedad2cb12ed70a2ce246deba733723d43d27c22982620a022f159ef819. 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/fde0ff03-fc42-4a13-9701-0a6383928666.json and https://artists.proofprofile.net/proofs/artist/fde0ff03-fc42-4a13-9701-0a6383928666.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 0xc30a4bef6f5b93c4ce3f6aec91fa2e6db25224b52024830965807565d974a8d0. 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/QZHN32056563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a77a97daf791cc1b95dfb3c9094683a6c6e23f7c0604a0d70904d4970002574. 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/QZGWX2000919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79be8b1ba6231c0bde04c721c821843fb85ce7bcf613cfd84a714f15b35b86eb. 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/QZGWX2025322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5dc41fb9ad6e6c416c8470efe6d92ce713e777830099cc046d8aa0127efdcac. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZGWX2031119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x562a7c59cb2857a369394bdcc6e7de6aaabb0a35e1b60daef584f8bbad04461d. 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/QZGWX2062689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a6986a10c60d5309342ea87bd81a500f9d8bab65971e075a8e2edc8bc62a87. 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/QZGWX2098408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdaac5d168f22dff145205728cc0cafb86009fe7b3f17008456b81c22689abc4. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZGWX2113600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18291250f87f5c3086d49c513fb4a730afc88b04f9af46dd62d053b3a852bcc2. 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/QZGWX2142701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6e370ec17cebba3e41447e307067d4203c375c9f92eeb95509fb0dd07987c0. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/FRX762135357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d18f0c47ebd5b14bf2af67b29db5d874568b6f80be4e600d5ce21260745130b. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/GX4R52261611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b466bc8d85d738e37befa2f65f52741cc9329ca336c7f1f8cdef4f239b9b47. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/DGA072295580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79ef15871b6f3f0c55277b74cce699f6a10eb5fa5cb96f93c43a01eb025ede06. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/GX8LE2370796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75e6a7f2c12d75a54901b55f808a9a1f2d7862deec52ed5c57cc9ec8874f6bf9. 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/QZPJ32277909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0425cb3deadf05d1d6071943e5569b6ac08897f1cce2b014d9bdb742dc87fec4. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/DGA0L2392766.