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Numa Wallet: Air-gapped Signer

by CRYPTO SOFTWARE LTDA more by this developer →

Numa Wallet: Air-gapped Signer has 1 ratings, averaging 5.0 stars, #27,221 of 33,220 in Finance.

#574,331 of 727,490 by ratings on Apple (down 4,603 since 09/16/2026) · #27,221 of 33,220 in Finance

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Category: Finance

Description

Numa Wallet — Bitcoin & Ethereum: Watch-Only + Air-Gapped Signer

Your keys, your coins. No compromises.

Numa Wallet is a wallet built for self-custody — now for Bitcoin AND Ethereum. Use it as a watch-only wallet to monitor your holdings, or turn an old phone into a fully air-gapped hardware signer — no internet, no third-party servers touching your keys, no hardware purchase needed.

— WATCH-ONLY BITCOIN —

Import your xpub, ypub, zpub, or full output descriptor to track balances and transactions in real time. Supports all major address types: Native SegWit (bech32), Taproot (bech32m), Nested SegWit, and Legacy. Build unsigned transactions (PSBTs) and exchange them with your signer via animated QR codes.

• Multiple wallets with instant switching
• Full transaction history with fee and confirmation details
• Receive addresses with QR codes
• Replace-By-Fee (RBF) for stuck transactions
• Fiat conversion in 10+ currencies
• Multisig support (2-of-3 and beyond)

— WATCH-ONLY ETHEREUM — NEW —

Follow your ETH and major tokens — USDT, USDC, DAI — on Ethereum mainnet, with the same rule as everything else in Numa: no keys ever stored on the online device.

• Import a plain 0x address, or pair with your signer via QR (MetaMask-compatible account export)
• Send ETH and tokens with air-gapped QR signing
• Safe multisig support: collect owner approvals and execute — the entire flow over QR codes
• Sent transactions appear in your activity instantly
• Live balances via public RPC — no accounts, no API keys
• Address book with contact labels shown at signing time

— SIGNER MODE —

Transform any phone into a dedicated signing device. Signer mode blocks all internet access at the code level — your seed phrase never leaves the device and never touches a network. Sign transactions by scanning QR codes from your watch-only wallet.

• 100% air-gapped — no Wi-Fi, no cellular, no Bluetooth required
• Signs Bitcoin PSBTs and Ethereum transactions, Safe multisig approvals (EIP-712), and messages
• Full on-device review before every signature: recipients, amounts, fees, token details — with explicit warnings for unknown contracts, delegate calls, and gas-refund clauses
• BIP39 seed phrase import (12 or 24 words), optional BIP39 passphrase
• Export your account via QR for easy pairing (Bitcoin xpub / Ethereum crypto-hdkey)
• Temporary signer mode — keys held in memory only, wiped on exit
• QR exchange via UR and BBQr encoding, compatible with the open Keystone/MetaMask standards

— SECURITY FIRST —

Your seed phrase is encrypted locally with AES-256-GCM using a key derived from your PIN via Argon2id (winner of the Password Hashing Competition), combined with a device-bound key stored in the system keystore (iOS Keychain / Android Keystore). Even if someone extracts your encrypted data, they cannot decrypt it without both your PIN and the physical device.

• Argon2id key derivation (64 MiB, memory-hard — brute-force resistant)
• AES-256-GCM authenticated encryption
• Device-bound key in the system keystore — encrypted data is useless off-device
• Optional encrypted NFC card backup for your seed (Argon2id + AES-256-GCM)
• Face ID / Touch ID for quick unlock
• Auto-wipe after 5 failed PIN attempts
• Cloud backups blocked for all key material
• No analytics, no tracking, no accounts, no registration

— PRIVACY —

Numa Wallet never asks for your name, email, or phone number. There are no accounts, no cloud sync, and no telemetry. Your financial data stays on your device.

— SUPPORTED LANGUAGES —

English, Portuguese, Spanish, German, Italian.

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