Hal Walker (March 20, 1896 – July 3, 1972) was an American film director. He was known for doing some of the earliest Dean Martin and Jerry Lewis films such as At War with the Army and Sailor Beware 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 0x565f2a8cf9c9eb6d3062afa6e2de476ec28b615118f1eba14c9e7869ef390dc2. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d29e4fca-bb85-495f-bedf-34896fae3d05.json and https://artists.proofprofile.net/proofs/artist/d29e4fca-bb85-495f-bedf-34896fae3d05.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).