Opaque

A private, post-quantum wallet for Arc and XRPL: payments through a relay mesh, and a separate account for every app.

Opaque is one private wallet for every chain it runs on, in your browser's side panel: Arc mainnet (real USDC), Arc testnet and XRPL testnet (no value). A picker in the header switches between them, and each keeps its own account. XRPL sites that support GemWallet or Crossmark can connect to it. Deposit USDC and it becomes notes of 1, 2, 5, 10, 20, 50 or 100 USDC. Each note sits in a pool with others of its size. When you pay, the wallet proves on your device that you own one note out of a ring of eight, without saying which one. The payment is sealed, then sent through three relays, so no single party links your device to what you paid. Anyone can see deposits and settlements on chain, but not which deposit paid which recipient. Your account is secured by a post-quantum, hash-based (FORS+C) key that never leaves your browser. Deposits and withdrawals are signed by that key, and no other wallet is needed: fund your Opaque address from any wallet or exchange. On the XRP Ledger, XRP, RLUSD and USDC sit in pools the same way, and every key that signs there is used once and then replaced. - Private sends of any whole amount, using the fewest notes - Post-quantum account key, with a visible signature budget and key rotation - Payments and account reads routed through a three-hop relay mesh - Encrypted backup and restore - No accounts, no analytics, no trackers Early software, stated plainly: the mainnet contracts are not yet audited, one attester signs spends, and all six relays are run by one operator. On Arc, sealed payments are opened only inside a Chainlink CRE enclave; on XRPL testnet an ordinary server stands in for it. Use small amounts on mainnet, or try it first on testnet.