Hans Haas (17 October 1906 – 14 May 1973) was an Austrian Jewish weightlifter who competed in the 1928 Summer Olympics and in the 1932 Summer Olympics. He was born in Vienna. In 1926, he became the A
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 0xc3df6ada0c822f67ce0566abdf44805af7b47fa5ce74e38cd4f7c4943394e490. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ba4cbced-a77b-4563-94ff-81b776bb1a85.json and https://artists.proofprofile.net/proofs/artist/ba4cbced-a77b-4563-94ff-81b776bb1a85.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).