Zygmunt Erazm Gaspar Józef Sierakowski (, ; 19 May 1826, – 27 June 1863, Vilnius) was a Polish leader of the January Uprising in lands of the former Grand Duchy of Lithuania in the Polish–Lithuanian C
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 0xd710a17d247b6ba01516e80c1a3011cfb3d27f19162091ea1198ed2a04dd1ece. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/79c0d22e-2c6d-4ccc-92b8-700deb35e7d1.json and https://artists.proofprofile.net/proofs/artist/79c0d22e-2c6d-4ccc-92b8-700deb35e7d1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).