Bert Boeren (born March 11, 1962) is a Dutch jazz trombonist and educator. Early life and education Boeren was born in Vught, Netherlands, on March 11, 1962. He took up the trombone at the age of 16
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 0x330bf125862df1e0311cdae5a73dbd8c409e869d0f06ebd0a690d0e88e71535b. Chain 2 (Bitcoin): anchored in block 953857 (2026-06-15T23:34:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/02340f61-a58e-41a0-bfcd-af20b7da4fa7.json and https://artists.proofprofile.net/proofs/artist/02340f61-a58e-41a0-bfcd-af20b7da4fa7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).