内田雄馬 with 石川界人, 榎木淳弥, 斉藤壮馬, 畠中祐, 花江夏樹, 八代拓
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 0x5560d2fc81eda4748161dcbb497c8e4b4fe3ab08620e6655802f8f88822919d3. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/99a36fe1-ccc9-48ab-bcf8-b5c00e990df4.json and https://artists.proofprofile.net/proofs/artist/99a36fe1-ccc9-48ab-bcf8-b5c00e990df4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).