DN, dN, or dn may refer to: Science, technology, and mathematics Computing and telecommunications Digital number, the discrete of an analog value sampled by an analog-to-digital converter Director
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 0xa595e585d60cfcc8d20ae48fedae8e8af10f6484c73c33e6d4fb404d59ca2d28. 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/889c0ccd-cbf7-4cf8-92fc-54dfb0c7616c.json and https://artists.proofprofile.net/proofs/artist/889c0ccd-cbf7-4cf8-92fc-54dfb0c7616c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).