No Second Chance is a thriller released in 2003 and is the fifth stand-alone novel written by Harlan Coben. It was the first international Book of the Month Club pick in 2003. Plot Dr. Marc Seidman h
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ec62982dd09df07b9236726fcf23c51d9d3eb10830bfaf0db97027a5af27e4. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/53fa317c-7ac7-418e-ac43-d40fd93f70d9.json and https://artists.proofprofile.net/proofs/artist/53fa317c-7ac7-418e-ac43-d40fd93f70d9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).