Rainy Day may refer to: Music Rainy Day (band), a Paisley Underground band from the 1980s Rainy Day (album), a 1965 album by jazz trombonist Kai Winding Songs "Rainy Day", a song by Ice Nine Kills f
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 0xef1d02ec8607923bb47a67cbad46de52ddbff4fe183b94e7f958f0a52f120afb. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/20dd09f9-88ac-47cc-814a-107f1925ed10.json and https://artists.proofprofile.net/proofs/artist/20dd09f9-88ac-47cc-814a-107f1925ed10.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).