A demon slayer is a person who hunts and slays demons. Demon Slayer may also refer to: Demon Slayer (shogi), a trap opening in shogi Demon Slayer: Kimetsu no Yaiba, a Japanese manga series Demon
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 0xf4a786c21a0636f99b2cb93b43ee2593bbd6c321284422c689acab94dcb35540. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e19a70e4-4b44-4a04-85de-3b9d424e3579.json and https://artists.proofprofile.net/proofs/artist/e19a70e4-4b44-4a04-85de-3b9d424e3579.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).