thumb|upright=1|Mid-18c watercolor, purportedly a portrait of Henri Dumont Henri Dumont (; also Henry Du Mont, originally Henry de Thier) (1610 – 8 May 1684) was a baroque composer of the French scho
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 0xabdd6439f0e173b76eaac7b353bd3b329c510686b410fb1d30480716b6bdb43d. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/113deb74-bfdb-4d1d-a81d-95f5ca3e1ed6.json and https://artists.proofprofile.net/proofs/artist/113deb74-bfdb-4d1d-a81d-95f5ca3e1ed6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Du Mont: Messe des anges & Messe royale (Mono Version)
Du Mont: Motets pour la chapelle du Roy, Extracts (Stereo Version)
Henry du Mont - Motets à la Chapelle de Louis XIV
Du Mont: Motets for the Chapel of Louis Xiv at the Louvre
Du Mont: Grands motets pour la Chapelle de Louis XIV au Louvre
Du Mont: Loüez par des chansons nouvelles…
Du Mont: Loüez par des chansons nouvelles...
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 0x8f276aa3d51e8cb0d8a600132581f950ca4a1dacf8fec52eaaccbb2e519f9567. 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/FRZ141525070.
Dumont: Bauyn Manuscript: Pavane de Mons. Dumont