Roma Ligocka (born Roma Liebling, 13 November 1938) is a Polish writer, and painter. She was born in a Jewish family in Kraków a year before World War II. During the German occupation of Poland, her
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 0x750550f5d5659b3eceb71bc2f20f26bc3c4a008a442a9e7c74376774c47bfa45. Chain 2 (Bitcoin): anchored in block 954689 (2026-06-21T10:35:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e285025f-9bc7-4308-ad33-179d8889625e.json and https://artists.proofprofile.net/proofs/artist/e285025f-9bc7-4308-ad33-179d8889625e.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.