Your keys.
On-chain proof.
Books that balance.

Is securing digital assets only about storing private keys? Or is the real question how transactions are authorized, verified and recorded?

In early 2025, about 1.5 billion dollars were taken from a major exchange's cold wallet. No private key was stolen; the hardware wallets were in place. The signers approved a transaction that looked routine on screen, but the data they signed handed control of the wallet to the attacker. Every day, people lose assets the same way: by signing a transfer to a "poisoned" address that resembles one from their history, or an unlimited token approval.

That thought shaped modPAY. It rests on three principles:

1. Your keys stay with you. Recovery phrases and keys never leave the device; the server and its administrators cannot reach them.
2. You sign what you see. Signing Guard decodes the signed transaction on the device and compares network, recipient, amount, token, fee and signer with what was on screen. Any difference and nothing is sent. The wallet signs plain transfers only: no approvals, hidden contract calls or delegations.
3. Nothing is booked until the chain confirms it. Payments and refunds reach the ledger only after on-chain confirmation.

Safe without being tiring: no extra step for verified merchants, your own accounts or addresses you paid before. A first-time recipient asks for the last 4 characters of the address; a lookalike of an address in your history asks for 8. Addresses are shown in easy-to-compare groups of four.