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 0x09109aaed241db903f1004376c2029e40bb476e5317d74f677bc3eb560f4a60f. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dca902f0-a90d-4a22-ac1e-580efa4b2e34.json and https://artists.proofprofile.net/proofs/artist/dca902f0-a90d-4a22-ac1e-580efa4b2e34.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Plovdiv`s Children`s Choir/Tomas Gubitsch
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 0x5a85e20a25664f5bed5e0c44bc42b7e984d04bf96c379d14425449dfa665f9f1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FR97R9900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e8ae7ee8b739782f38815463c4f4e85e514af8834c7a1b7eaf42298e6ff107e. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-21T16:58:33Z), 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/FR97R9900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9229c88c407ecb32bb1745f2eba4ee620d81e909092efb94278baa9f50d01b83. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FR97R9900013.
Pepa Nzac Gnon Ma (traditionnel arr. P. Akendengué): Prélude de la Partitia pour violon no3
Classics Reframed - Bach, Vivaldi & Mozart
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ca598ac7034cacd1146f0385fbfd587b4bce88eeae2efff9044ec044e1cf49d. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-21T21:42:15Z), 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/GBPFX0900012.
Mayingo (traditionnel arr. P. Akendengue): Fugue sur Mayingo (T. Gubitsch)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56e8f43d21ea280e02502fe85bd3a55418e818effc1a81c00eed231b20ce99f2. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBPFX0900010.