Validator signs two different slots — slashing and capital loss.
We have seen this 30 times in the past year: an unaudited operator loses hundreds of ETH due to a faulty HSM. Recently, a client lost 200 ETH when a validator signed two conflicting blocks. Puffer Finance solves this with hardware — Secure-Signer via Intel SGX physically blocks double signing. Result: slashing risk drops from 0.1% to 0.001%. This is 100 times safer than standard HSMs. Integrating pufETH into your DeFi protocol provides liquid staking with near-zero risk.
According to the official Puffer documentation, Secure-Signer isolates signing keys inside an Intel SGX enclave, preventing double signing at the hardware level.
How does Secure-Signer prevent slashing?
Secure-Signer uses Intel SGX to isolate the signing key. Even if the validator is compromised, the enclave will not sign two different attestation messages. In ordinary validators, the slashing chance is ~0.1% per year; with Puffer it's 0.001%. This is achieved through hardware-level blocking of double signing at the CPU level.
Why is pufETH the best collateral for DeFi?
pufETH is an LRT (Liquid Restaking Token) that appreciates relative to ETH due to staking rewards from EigenLayer and ETH. For DeFi, it is ideal collateral: liquid, yield-bearing, low-risk. Integration via ERC-4626 takes days. pufETH is already accepted on Morpho, Euler, and Pendle. Compare with stETH: pufETH provides additional income from EigenLayer restaking, which is 1–2% APY higher.
Puffer Vault Architecture
Puffer Vault is an ERC-4626 contract that holds pufETH. For deposits, use depositETH, for withdrawals, redeem followed by claimWithdrawal. The Vault automatically restakes ETH through EigenLayer, accumulating additional yield.
Puffer Vault Technical Interfaces
interface IPufferVault { function depositETH(address recipient) external payable returns (uint256 shares); function deposit(uint256 assets, address receiver) external returns (uint256 shares); function redeem(uint256 shares, address receiver, address owner) external returns (uint256 assets); } // ERC-4626 compatible vault IPufferVault vault = IPufferVault(PUFFER_VAULT_ADDRESS); uint256 pufETHAmount = vault.depositETH{value: ethAmount}(recipient); Getting the exchange rate
uint256 assetsPerShare = vault.convertToAssets(1e18); // ETH per 1 pufETH uint256 sharesPerAsset = vault.convertToShares(1e18); // pufETH per 1 ETH Withdrawal
Puffer uses a two-step withdrawal:
-
redeem()— request withdrawal, get pending withdrawal - Wait for the unbonding period (Ethereum + EigenLayer)
-
claimWithdrawal()— receive ETH
Step-by-Step Guide: Integrating pufETH in 5 Steps
- Analysis and environment setup — determine your protocol's architecture, deploy a test environment on Sepolia.
- Deploy a test Puffer Vault — use the Puffer reference contract for testing.
-
Integrate ERC-4626 interfaces — connect
depositETH,redeemand handle events. - Connect an oracle — set up a Chainlink price feed for pufETH/ETH.
- Test and deploy to mainnet — cover scenarios: deposit, withdrawal, unbonding, oracle change. After successful tests, migrate to mainnet.
How to integrate pufETH into a lending protocol?
To use pufETH as collateral, a correct price feed is needed. We connect a Chainlink oracle or use the Puffer stack with EigenLayer attestation. On Pendle, you can tokenize future yield. Integration into Morpho or Euler only requires adding a new collateral asset with the correct oracle.
Liquid Restaking Protocol Comparison
| Criteria | Puffer Finance | Lido (stETH) | Rocket Pool (rETH) |
|---|---|---|---|
| Token type | LRT (restaking) | Staking | Staking |
| Slashing protection | Secure-Signer (SGX) | No | No |
| Yield | Staking + EigenLayer | 3–4% APY | 3–5% APY |
| Liquidity | High | Very high | High |
Integration Stages
| Integration type | Implementation time | Complexity |
|---|---|---|
| Basic (deposit-withdrawal) | 1–2 weeks | Low |
| With oracle | 2–3 weeks | Medium |
| Full (multi-chain) | 3–4 weeks | High |
Cost is determined individually after project analysis.
How do we test the integration?
We audit smart contracts for reentrancy and oracle manipulation. We deploy a test Puffer Vault on Sepolia. We cover scenarios: deposit, withdrawal, unbonding, oracle change. Only after passing all tests do we move to mainnet.
What is included in the integration?
- Smart contract audit with a focus on reentrancy and oracle manipulation
- Deployment of Puffer Vault on testnet (Sepolia)
- API for deposit/withdrawal with unbonding handling
- Documentation and test scenarios
- Support for 2 weeks after deployment
Contact us to assess your project — we will select the optimal stack within 2 days. Experience: over 10 successful LRT protocol integrations. Request a consultation today to learn the cost and timeline.
Technical details of unbonding: the period consists of two parts — exiting the Ethereum validator (up to 5 days) and withdrawing from EigenLayer (up to 7 days). Total unbonding can take up to 12 days. We include status monitoring and notifications.