David Hilowitz (born 1981) is an American composer, YouTuber, and software developer based in Philadelphia, Pennsylvania. He is known for his YouTube channel "David Hilowitz Music," which features DIY
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0241551d0c146e1b5c94c96d5ff2358c35fc072ff36578c38e2c90741a850a63. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/92134bbd-51a4-4643-aff4-03a2ac101d2e.json and https://artists.proofprofile.net/proofs/artist/92134bbd-51a4-4643-aff4-03a2ac101d2e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).