Yordanka Hristova (in Bulgarian Йорданка Христова) is a Bulgarian singer. thumb|right|255px|Yordanka Hristova in 2018 Biography Academician Yordanka Ivanova Hristova was born on 10 September 1943
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 0x1d811754990d62da5dd9e1b892a7d2cc727c97fca0cf36b74ab401684bb8c700. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1e77097e-0bb4-4857-8c05-87993256d5ba.json and https://artists.proofprofile.net/proofs/artist/1e77097e-0bb4-4857-8c05-87993256d5ba.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).