thumb|right|300px|The Villa Medici in Fiesole with early terraced hillside landscape by Leon Battista Alberti thumb|The Villa Tamminiemi, an Art Nouveau styled villa and house museum in Helsinki, Finl
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 0xe60a018b9248f3ec45a6eb1f6cf99fe2a4a9153df7a188b70529f61b7762e5e9. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e42e388f-76cb-47d6-b3ee-9974c6e90818.json and https://artists.proofprofile.net/proofs/artist/e42e388f-76cb-47d6-b3ee-9974c6e90818.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Kitsuné Soleil Mix 2 by Gildas Kitsuné & Jerry Bouthier
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 0x7d7e6d04794e00b1d78a04942c846dfcaf425c3821fa05d16e255f15a06607a8. 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/FRU701300067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x289eb147ac663fbb5be18406104e910c5186daa50ee16a1c1086c331e5f10d91. 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/ZAA642100003.
Anniversary Collection (by Stéphane Pompougnac, Charles Schillings & Ravin)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf078cd0e51c3bcd5e0d207e52d2dc72ecbf3ac10143d962eef0db4e98945634. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QMFME2175766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b11aae214eff9d478682256b5d139046930516d8bc49fbba71fd945cc356f2. 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/FRPHR1300250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b5158a2f1cbe35351c152556abd3962a790e21d2947d146a4497b7e4d56e6fd. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/ZA56E2200052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde224176bc43457d42067329a9c06f72c7357ff63ca5143623819218eef65540. 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/BEN812100011.