Sour Heart is a 2017 short story collection by Chinese American writer Jenny Zhang. Consisting of seven stories involving different Chinese families and their daughters, it was published by Lenny 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa59965db4e29a0ef09cda0461f038e0246c45d412b977a35985cf8e08a82c228. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/48daf684-e805-4fbb-866d-598520d424e6.json and https://artists.proofprofile.net/proofs/artist/48daf684-e805-4fbb-866d-598520d424e6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).