Matthijs Verschoor (born 1955) is a Dutch classical pianist. He grew up in EnkhuizenConcert program (in Dutch) and studied at the conservatories of Rotterdam and Amsterdam and continued his studies
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 0xacbc78b59ac56e47f434c559a1f14f6e43d9e1ae0cb72e81d6035fdf527b7a26. Chain 2 (Bitcoin): anchored in block 954115 (2026-06-17T15:44:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7b3a9124-abda-48b0-94cb-38ddd5007907.json and https://artists.proofprofile.net/proofs/artist/7b3a9124-abda-48b0-94cb-38ddd5007907.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).