Zahna () is a town and a former municipality in Wittenberg district in Saxony-Anhalt, Germany not far from Federal Highway (Bundesstraße) B 2 and about 11 km east of Lutherstadt Wittenberg. It was the
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 0x7f92856c5583053f276d016aa38e8338c92928b5a1a2d1ffc14d8084afa7a85e. 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/9224782d-4943-470c-a1d3-8b1d000be2e2.json and https://artists.proofprofile.net/proofs/artist/9224782d-4943-470c-a1d3-8b1d000be2e2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).