Restaking is a mechanism that allows Ethereum (ETH) that has already been staked for network validation to be used a “second time” to secure additional services. EigenLayer is the protocol that pioneered this infrastructure, creating a marketplace for decentralized trust.
This architecture powers many of the “Onchain TradFi” platforms like Ether.fi and other decentralized financial services.
The Core Problem: Fragmented Trust
Traditionally, if someone wanted to build a new decentralized network (like a bridge, an oracle, or a settlements layer), they had to build their own “trust” from scratch. This meant convincing enough people to buy and stake a new, often volatile token to secure the system.
Fragments of trust are expensive and insecure. EigenLayer solves this by allowing developers to “borrow” the existing, massive security of the Ethereum network.
The Mechanics of Restaking
Restaking works by adding an additional layer of smart contract permissions to staked ETH.
- Staking: An investor stakes their ETH to secure the Ethereum network (often receiving a Liquid Staking Token like stETH or eETH in return).
- Restaking: The investorแล้ว “commits” that same staked ETH to the EigenLayer smart contracts.
- Opt-in: The investor chooses specific Actively Validated Services (AVS) to secure.
The ETH is effectively “doubled up”: it continues to secure Ethereum, but it is also pledged as a guarantee for the new AVS.
Actively Validated Services (AVS)
An AVS is any system that requires its own set of decentralized validators for verification. Examples include:
- Cross-chain Settlement: Marketplaces that route transactions across multiple blockchains.
- Oracle Networks: Delivering real-world data to the blockchain.
- Data Availability Layers: Ensuring data remains accessible for L2s.
By using EigenLayer, an AVS can tap into Ethereum’s security without launching its own token.
The Slashing Engine: The Cost of Security
The “guarantee” of restaking is enforced by Slashing.
- Economic Punishment: If a validator for an AVS behaves maliciously or fails to perform their duties, a portion of their restaked ETH is permanently Revoked (slashed).
- Risk Layering: A restaker is now exposed to multiple sets of slashing conditions. They could be slashed by Ethereum, or they could be slashed by any of the AVSs they have opted into.
- Yield: In exchange for taking on this additional risk, restakers earn additional rewards from the AVSs they secure.
Impact on Consumer Platforms
Platforms like Ether.fi Cash utilize these mechanics to create “native” yield. By restaking user collateral, they can generate higher APYs than simple staking alone, which then funds the cashback and credit limits for their card products.
Summary
EigenLayer turns Ethereum’s security into a commodity that can be rented by other protocols. For the user, it provides a path to higher yield, but it also introduces a “layered” risk model where a bug in an AVS could impact the safety of their underlying ETH.
See also: Ether.fi Cash Review, Why Yield is Not Free
