Johanna Winter (born 21 May 1942) is an Australian-German fencer. She competed for Australia at the 1960 and 1964 Summer Olympics. At Tokyo in 1964 her sisters Ulrike and Val Winter were also members
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 0x5ae8c2efab6acbaef58339176731846eb4c45ed2a90fd5cb784b63348e76832a. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4f671db5-fe6e-4df5-8790-960d89740a6c.json and https://artists.proofprofile.net/proofs/artist/4f671db5-fe6e-4df5-8790-960d89740a6c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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