Confidential Transfer

A confidential transfer moves ERC-7984 tokens where the amount is encrypted on-chain — hidden from block explorers and even from the recipient until they decrypt it. In the app this is the Transfer page.

How it differs from a normal transfer

• The amount is encrypted client-side before it's submitted, so the transaction carries a ciphertext, not a number.
• The sender and recipient addresses are still public — FHE hides the value, not the graph.
• The recipient must run their own decrypt (an EIP-712 permit) to learn how much they received.

Using the SDK

useConfidentialTransfer takes the wrapper address and returns a mutation. The SDK encrypts the amount, then submits — you get lifecycle callbacks for each phase.

import { useConfidentialTransfer } from '@zama-fhe/react-sdk';
import { parseUnits } from 'viem';

function SendForm({ wrapper }: { wrapper: `0x${string}` }) {
  const { mutateAsync: transfer } = useConfidentialTransfer({
    tokenAddress: wrapper,
  });

  const handleSend = async (to: `0x${string}`) => {
    await transfer({
      to,
      // wrapper decimals are always 6
      amount: parseUnits('25', 6),
      onEncryptComplete: () => console.log('amount encrypted, submitting…'),
      onTransferSubmitted: (hash) => console.log('submitted:', hash),
    });
  };

  return <button onClick={() => handleSend('0x…')}>Send 25 confidentially</button>;
}