Marcel Worms (born Amsterdam, 1951) is a piano player from the Netherlands. Education After completing secondary education at the Vossius Gymnasium, Worms started studying Biology. He became a biolog
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 0x4b46f574d6eec10e8dbe0cf4ddcc130af61728700b74ab964ebe3016c5de6dc0. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/06eddab3-ea73-45ab-9903-e2ed4e0fd18d.json and https://artists.proofprofile.net/proofs/artist/06eddab3-ea73-45ab-9903-e2ed4e0fd18d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Tangos for Piano from Latin America & Europe
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 0xf5a3be6d13c99bdb1e5b6f868600a3c5583e0ceeaa86c6bcabd5e53b20681efa. 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/NLY431700018.
The Voice of the Viola in Times of Oppression, Vol. 2
Bach, Mendelssohn & Shostakovich: Preludes & Fugues
Piano Works by Jewish Composers, 1922-1943