Márta Fábián (born 1946 in Budapest) is a Hungarian cimbalom player and soloist. Early life and education Fábián began playing at the age of 8. Since 1956 she has been a member of the Broadcast Ch
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 0x3379a1b7b384ecc63c5fd533ee117e47dc78552b2a9a46d6f643f4f549e4e886. Chain 2 (Bitcoin): anchored in block 954035 (2026-06-17T02:39:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3cb471e5-31f7-41d2-956d-ee03d1b39382.json and https://artists.proofprofile.net/proofs/artist/3cb471e5-31f7-41d2-956d-ee03d1b39382.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).