Five Thirty, sometimes written 5:30 and 5:30!, were a three-piece rock band from London, England, briefly popular in the early 1990s.Martin C. Strong, The Great Indie Discography. 2nd edition. London:
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 0x8a43cf06d1ac38cdb085d370dc8d2d14e91c9b78230c04265052047e01a9bb8c. Chain 2 (Bitcoin): anchored in block 954500 (2026-06-20T04:47:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9c4602cc-b70e-4401-bac8-203f90c06827.json and https://artists.proofprofile.net/proofs/artist/9c4602cc-b70e-4401-bac8-203f90c06827.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).