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 0x468d319ced8451dd7f8abebf9c8031190ffb202858be184a4ab3f8c9741ad7e2. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2cadc40a-f61b-4f11-b823-ec03981f1f2a.json and https://artists.proofprofile.net/proofs/artist/2cadc40a-f61b-4f11-b823-ec03981f1f2a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Herman van Vliet: Romantisch Recital, Martinikerk, Bolsward
Herman van Vliet plays works of Max Reger at the organ of the Grote Kerk, Breda
Herman van Vliet joue Charles-Marie Widor
Herman van Vliet joue Guilmant's Pièces dans differents styles, Vol. 4
Herman van Vliet plays George Frideric Handel
Herman van Vliet joue Guilmant's Pièces dans differents styles, Vol. 2
Herman van Vliet joue Guilmant's Pièces dans differents styles, Vol. 1
Speelt Eigen Bewerkingen Over Psalmen En Gezangen
Herman van Vliet joue Guilmant's Pièces dans differents styles, Vol. 3
Herman van Vliet plays his own Choral Preludes
Herman van Vliet: Kerstsuites Jan Zwart & Kerstmelodieën Feike Asma
Herman van Vliet plays the organ of the National Museum at the Buurkerk, Utrecht
Herman van Vliet joue Guilmant's Pièces dans differents styles, Vol. 5
Herman van Vliet plays Sigrid Karg-Elert
Herman van Vliet plays the Naber-organ, St. Joriskerk, Amersfoort, The Netherlands
Herman van Vliet plays the organ at the St. Joriskerk, Amersfoort
Herman van Vliet plays his own Chorale Preludes
Herman van Vliet: Recital on monumental organs
Herman van Vliet plays Joh. Gijsbertus Bastiaans
Herman van Vliet: Introduction Widoriade
Herman van Vliet plays Chorale Preludes of Feike Asma