Pitch Dark is a 1983 modernist novel by Renata Adler about a newspaper reporter's affair with a married man. Decades after falling out of print, Pitch Dark was reissued in 2013 by New York Review Book
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 0x157621bfe5f8b6ca34d7c10c933cd9d99fbd25457d61bc9c1185a6d34a1ff72e. Chain 2 (Bitcoin): anchored in block 954055 (2026-06-17T05:51:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/446bb415-bae7-47e5-84bf-6c47e2dd5445.json and https://artists.proofprofile.net/proofs/artist/446bb415-bae7-47e5-84bf-6c47e2dd5445.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.