Rabbi Aharon Feldman (; born 18 January 1932) is an Orthodox Jewish rabbi and rosh yeshiva (dean) of Yeshivas Ner Yisroel (Ner Israel Rabbinical College) in Baltimore, Maryland. He has held this posi
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 0xb5f4ab3e3f33cd4e19aa4efff350cf122d1b8c7c9f67fe13c85d771ccd053ec5. Chain 2 (Bitcoin): anchored in block 953885 (2026-06-16T04:12:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0cad313c-8281-48bb-bcfb-f93c3d1e4194.json and https://artists.proofprofile.net/proofs/artist/0cad313c-8281-48bb-bcfb-f93c3d1e4194.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.