Eva-Maria Houben (born 15 January 1955) is a German composer, organist, pianist, musicologist and university lecturer. Life Born in Rheinberg, Houben grew up in Kamp-Lintfort. Her mother worked as
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 0x0f1104178fc25657aba5966ff52ba8134a1526759488991feec8334a26b893a8. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/69643fd6-3b6a-4081-87dd-54bc79871726.json and https://artists.proofprofile.net/proofs/artist/69643fd6-3b6a-4081-87dd-54bc79871726.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Eva-Maria Houben: Livre d'heures - Book of Hours
Eva-Maria Houben, Rebecca Lane, Samuel Dunscombe: Observing Objects
Eva-Maria Houben : Gesänge des tages und der nacht