Izabela Paszkiewicz ( Trzaskalska; born 9 January 1988) is a Polish long-distance runner. She competed in the women's marathon at the 2017 World Championships in Athletics. References External links
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 0xf249939c9e95f1cf16bac2e732afe096e5e9260bf056e9a61ea63f5133bf8684. Chain 2 (Bitcoin): anchored in block 954032 (2026-06-17T01:59:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3a4bab9f-a5d4-4732-9af0-bbad97337593.json and https://artists.proofprofile.net/proofs/artist/3a4bab9f-a5d4-4732-9af0-bbad97337593.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.