John Tropea (; born January 7, 1946) is an American jazz guitarist and composer. Career Tropea began guitar studies at the age of 12. His musical education continued at Berklee College of Music in Bo
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 0xcc83693d99f11553cc8ba81302cf07233e05a89f8bd4942217afe18180788100. Chain 2 (Bitcoin): anchored in block 954027 (2026-06-17T00:55:08Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/39e7f9c3-e28b-48f1-b9ac-5e17a78ed2be.json and https://artists.proofprofile.net/proofs/artist/39e7f9c3-e28b-48f1-b9ac-5e17a78ed2be.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).