Quantum immunity
Replaces vulnerable elliptic-curve keys with hash-based math that quantum computers cannot shortcut.
QSL1 · Post-quantum custody on Ethereum L1
Quantum-proof custody for your Ethereum assets.
QuantumShield L1 locks your ERC-20 tokens and NFTs in a vault that only moves when your device presents a hash-based STARK proof. No elliptic-curve keys to crack, no bridges, no leaving mainnet.
- Cryptography
- Hash-based
- Setup
- Transparent
- Settlement
- Ethereum L1
- 0Trusted-setup ceremonies
- 2128Quantum work to forge a proof
- 100%Of assets stay on Ethereum L1
- 1 txTo prove, verify and release
// 01 — Threat model
Q-Day breaks the keys, not the chain.
Every Ethereum account is guarded by an elliptic-curve key. Once a large quantum computer runs Shor's algorithm, any public key that has ever signed a transaction can be turned back into its private key. QSL1 moves custody behind hash functions, which quantum computers can only attack by brute force.
| Standard wallet | QSL1 vault | |
|---|---|---|
| Security assumption | Elliptic-curve discrete log | Hash preimage resistance |
| Shor's algorithm | Key recovered | No effect |
| Exposed on-chain | Public key, forever | Hash commitment, rotated every action |
| Authorization | ECDSA signature | Proof bound to the exact transfer |
| Trusted setup | — | None |
| Where assets live | Ethereum L1 | Ethereum L1, no bridges |
// 02 — How it works
Three steps. One vault. Zero curves.
-
01
Deposit
Lock your tokens in the QSL1 vault smart contract on Ethereum. ERC-20s and NFTs are supported.
vault.depositERC20(id, token, amount) -
02
Off-chain proof
To authorize a movement, your device builds a proof from ultra-secure hash functions. Your secret key never leaves it.
proof = prove(seed, nonce, digest) -
03
On-chain verification
The Ethereum L1 contract checks the proof and releases the transfer. No vulnerable signatures involved.
verify(proof) → release(to, amount)
// 03 — Key advantages
Built for the post-quantum era.
100% transparent
No secret setup ceremonies. Every parameter is public and every proof can be checked by anyone.
Native L1 custody
Maximum security and availability on Ethereum itself, with no bridges or secondary networks to trust.
// 04 — Vault console
Operate your quantum vault.
Your wallet pays gas and makes deposits. Withdrawals are authorized only by the proof generated in this browser.
Quantum key
—Vault actions
qsl1@prover:~$
Vault holdings
Reference implementation. This deployment verifies Winternitz one-time proofs (WOTS-16 over
keccak256): the same post-quantum, setup-free hash assumption STARKs rely on, checked in a single L1
transaction. The verifier is isolated in WOTS.sol so a full STARK verifier can replace it.