Fopp may refer to: "Fopp" (song), a 1975 song by the Ohio Players from Honey Fopp (EP), a 1988 EP by Soundgarden, featuring the song of the same name Screaming Life/Fopp, a 1990 compilation album
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f554de75aa508726bf01e0534fd5dcb3b335fe009da36006511f41c5f60ca60. Chain 2 (Bitcoin): anchored in block 953932 (2026-06-16T11:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1f31ebf0-6402-4de4-9206-cf4e043ddaf1.json and https://artists.proofprofile.net/proofs/artist/1f31ebf0-6402-4de4-9206-cf4e043ddaf1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).