Ruth Rubin (September 1, 1906 – June 11, 2000) was a Canadian-American folklorist, singer, poet, and scholar of Yiddish culture and music. Early life Born Rivke Rosenblatt in 1906 in Khotin, Bessarab
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 0xab2aafc9f14b11dd8ab0868746181443f0d0e58c249b912538909bb63e9e83c3. 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/3be6141c-d06b-4d3b-96f6-495637bd3a3a.json and https://artists.proofprofile.net/proofs/artist/3be6141c-d06b-4d3b-96f6-495637bd3a3a.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.