Fflur Dafydd (born 1 August 1978) is a Welsh novelist, singer-songwriter and musician. Though mainly publishing in Welsh, she also writes in English. She contributes regularly in Welsh to Radio Cymru.
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 0x5c4d2e1be85f9ef9ed74adb073f98ee8f8c0bc8b957770671fdb921904f84889. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f8da15da-d756-4e99-8069-779a7e406fec.json and https://artists.proofprofile.net/proofs/artist/f8da15da-d756-4e99-8069-779a7e406fec.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).