De Plattfööt, () are a folk music duo from the German State of Mecklenburg-Western Pomerania composed of singer-songwriters and guitar players Peter Wilke and Klaus Lass. They were founded in 1979,
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 0xcc615b8f743514ed9f3c80a2f4c94b25faab4d6cf4f71248663c04bd1aed2c50. Chain 2 (Bitcoin): anchored in block 953860 (2026-06-15T23:55:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/03176b82-b53b-49c5-af7d-7a410c58137b.json and https://artists.proofprofile.net/proofs/artist/03176b82-b53b-49c5-af7d-7a410c58137b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.