Interflug GmbH (; ) was the national airline of East Germany (officially the “German Democratic Republic”) from 1963 to 1991. Based in East Berlin, it operated scheduled and chartered flights to Europ
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 0x2db6511daa4a8e87dbd6abd74c38a8e265e22ce84f8c59fec38304879c03d5f0. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5892ccff-58b4-46e1-90d0-54f3c947dfcb.json and https://artists.proofprofile.net/proofs/artist/5892ccff-58b4-46e1-90d0-54f3c947dfcb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).