Hazy Sour Cherry is a four-piece indie rock band from Tokyo, Japan. The band members were prominent in the Tokyo indie music scene before, being members of other various bands before forming the indie
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 0x1b3504bf3d6ef0afc68361161fc160aae5bd8dd072932df570241733de93b7b0. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/26f598f7-8e47-479d-b83d-a379f1d403e5.json and https://artists.proofprofile.net/proofs/artist/26f598f7-8e47-479d-b83d-a379f1d403e5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).