thumb|Philipp Gropper (Aarhus, Denmark, 2016) Philipp Gropper (born 1978 in West-Berlin) is a German composer and saxophonist of jazz and of the modern creative style. Biography From 1999 to 2006,
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 0x969b4fb059df021a21f4687efaeddb69ad3b6b842ac7b49ca828158016988ea6. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3ad28c4-e63e-4fa8-87e9-6c0436c6e15e.json and https://artists.proofprofile.net/proofs/artist/d3ad28c4-e63e-4fa8-87e9-6c0436c6e15e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).