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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0251124f6a777eb9b3b55dfd834422faf919aeec9d3ebbe6574c403b0279c07. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8c038355-0274-4943-9187-18593dcc7137.json and https://artists.proofprofile.net/proofs/artist/8c038355-0274-4943-9187-18593dcc7137.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).