Nachman Seltzer (; born 1978) is an Israeli author, public speaker, and rabbi. He is known for his work in Jewish literature, particularly focusing on biographies and inspirational stories based on re
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 0xb0d831211ffee9bb5cab6000d95054a2539e63aa1f4a91b96b18c971bd469faa. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/871cf967-679d-4992-ae69-05832a6d9a54.json and https://artists.proofprofile.net/proofs/artist/871cf967-679d-4992-ae69-05832a6d9a54.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).