Crypto Wallet Custody: HD Key Tree & Multisig Security

Real crypto custody security rests on two mechanisms working together: hierarchical-deterministic (BIP-32) key derivation, which lets one seed generate an unlimited tree of signer keys and addresses, and multisig thresholds, which require several independent keys to agree before any transaction is valid. This simulator renders that tree in 3D — a master seed behind a cold/hot boundary, five derived signer keys, and their derived receiving addresses — and lets you toggle cold-storage air-gapping, set an M-of-N multisig threshold, and fire simulated breach attempts at the reachable keys to see, live, exactly when (and only when) an attacker actually accumulates enough signatures to move funds.