More secure than hardware wallets. No device to buy. Use any spare computer as your signer - it never touches the internet. 117+ blockchains. Open source. Free forever.
View on GitHubUse any spare computer or laptop as your signing device. It never needs to connect to the internet.
Private keys and seeds exist only on the Signer. The Wallet app sends unsigned transactions to the Signer, receives them back signed, and broadcasts via the Node.
Connect your Signer to your Wallet app via Bluetooth, USB, or local WiFi. The Signer never touches the internet - only the Wallet app connects to the Node.
Every line of code is auditable. No proprietary firmware, no secure elements with hidden code, no trust required.
Bitcoin, Ethereum, Solana, Cosmos, Polkadot, XRP, Cardano, Monero, and 110+ more. All major blockchain families supported natively.
BIP39, SLIP39, Aezeed, Electrum, WIF, Monero seeds, Codex32, SeedQR, SSKR, keystores, and dozens more. Import from any wallet.
Full UI in 42 languages across 10 writing systems. Arabic, Chinese, Hindi, Japanese, Korean, and more. True global accessibility.
Post-quantum signatures with ML-DSA-65 and SLH-DSA. Hardened 6-layer key derivation with PBKDF2 + Argon2id. Ready for tomorrow.
Unlimited independent accounts from one seed. Profile passwords derive completely unrelated keys. No way to detect they exist.
Run your Signer.io Node as a Tor hidden service. Built-in Tor management with automatic onion address generation and key export.
Dog, sun, key, heart, star, moon. Universally recognizable symbols that transcend language barriers. Visual recovery without words.
Write in Spanish, recover in Arabic. Mix languages freely. Accent-insensitive matching means corazón = corazon. Emoji input supported.
36-word seeds with 272-bit entropy and 16-bit checksum. Survives Grover's algorithm with 136-bit post-quantum security margin.
Your paper backup looks like random notes, not a crypto wallet. Hidden profiles mean you can reveal only what you choose, even under duress.
Offline device
Seeds & signing
User interface
Online
IP protected
Load balanced
117+ blockchains
Real-time data
Automatic failover with exponential backoff. Unhealthy nodes are isolated, healthy nodes absorb load. Zero downtime routing.
Persistent HTTP keep-alive pools per node. Token bucket rate limiting. Weighted load balancing across available nodes.
Relays can accept new nodes automatically via verified discovery. Health-checked, ban-capable, fully managed from the dashboard.
Real-time push updates for watched addresses. Live transaction notifications without polling. Low-latency event delivery.
Run nodes as Tor hidden services with built-in onion address management. Anonymous node operation with automatic key generation.
Per-profile API keys with per-coin access control. Firewall rules, rate limiting, and request logging built into every node.
| Feature | Signer.io | Hardware Wallets |
|---|---|---|
| Keys isolated from internet | ✓ | ✓ |
| Dedicated signing device | ✓ | ✓ |
| No device purchase required | ✓ | ✗ |
| No supply chain trust required | ✓ | ✗ |
| Fully open source (no hidden firmware) | ✓ | ~ |
| 117+ blockchains natively supported | ✓ | ~ |
| 40+ seed/key import formats | ✓ | ✗ |
| Post-quantum cryptography | ✓ | ✗ |
| Hidden profiles / plausible deniability | ✓ | ✗ |
| 42 languages / 10 writing systems | ✓ | ✗ |
| Built-in Tor hidden services | ✓ | ~ |
| Free forever | ✓ | ✗ |
Signer.io is free, open source, and built for everyone. No company controls your wallet. No device required. No compromises.