Anton Fils (also Antonín Fils, Johann Anton Fils, Johann Anton Filtz), 22 September 1733 (baptized) – 14 March 1760 (buried) was a German classical composer. Fils was born in Eichstätt, in the Bishop
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 0x1aa9c9bcab4ff8f1117265a8810433af3235890d4dad33f35d60fa0a1b09db66. Chain 2 (Bitcoin): anchored in block 954615 (2026-06-20T22:44:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c6259bda-cf15-4a48-9080-044766c4701a.json and https://artists.proofprofile.net/proofs/artist/c6259bda-cf15-4a48-9080-044766c4701a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).