was a after Gangyō and before Kanpyō. This period spanned the years from February 885 through April 889.Nussbaum, Louis-Frédéric. (2005). "Ninna" in ; n.b., Louis-Frédéric is pseudonym of Louis-Fré
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 0xe5bd8bda5b0bfb6207f0baa4e96eb484888200370c5102a745362ef1fbc4d5e3. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fa9dc39d-d63f-45f3-804c-33820011ff27.json and https://artists.proofprofile.net/proofs/artist/fa9dc39d-d63f-45f3-804c-33820011ff27.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).