Show HN: On-chain file authenticity via Solana NFT

DeepFakeSafety computes a SHA-256 hash of a file locally (never uploaded), signs that hash with your private key, and writes the resulting proof to Solana as an NFT.

Later, anyone can verify: - The file is unchanged (same hash) - Who signed it (public key) - When the proof was created (block time) - No centralized server is required.