TheDZhon / eth-staking-fee-distributor-contracts

eth-staking-fee-distributor-contracts

Running tests

cd eth-staking-fee-distributor-contracts
yarn
cp .env.example .env
# edit .env with the actual values
yarn typechain
yarn test

Basic use case

The basic use case is reflected in ./test/test-fee-distributor.ts

1. Anyone (deployer, does not matter who) deploys FeeDistributorFactory.

2. Anyone (deployer, does not matter who) deploys a reference implementation of FeeDistributor providing the constant arguments:

   • address of FeeDistributorFactory
   • address of the service (P2P) fee recipient
   • % of EL rewards that should go to the service (P2P)
   • % of EL rewards that should go to the client

3. The deployer calls initialize on FeeDistributorFactory with the address of the reference implementation of FeeDistributor from Step 2.

4. The deployer calls transferOwnership with the secure P2P address as an argument. Only the secure P2P address can now change the reference implementation of FeeDistributor and create new (per client) instances of FeeDistributor based on the reference implementation.

5. When a new client comes, the secure P2P address calls createFeeDistributor on FeeDistributorFactory with the client address as an argument. In the transaction log, there will be a FeeDistributorCreated event containing the address of the newly created instance of FeeDistributor.

6. Set the address from Step 5 as the EL rewards recipient in a validator's settings. Now the user's own copy of FeeDistributor contract will be receiving EL rewards (MEV, priority fees).

7. Anyone at any time can call withdraw on the user's own copy of FeeDistributor. The result will be sending the whole current contract's balance to

   • address of the service (P2P)
   • address of the client

   proportionally to the pre-defined

   • % of EL rewards that should go to the service (P2P)
   • % of EL rewards that should go to the client

   (See Step 2).

Contracts

We have 2 contracts: FeeDistributorFactory and FeeDistributor.

FeeDistributorFactory stores a reference implementation of FeeDistributor in its s_referenceFeeDistributor storage slot.

The owner of FeeDistributorFactory can change this reference implementation (upgrade) at any time via FeeDistributorFactory's initialize function.

For each client, a new instance of FeeDistributor is created via FeeDistributorFactory's createFeeDistributor.

FeeDistributor stores

• address of FeeDistributorFactory
• address of the service (P2P) fee recipient
• % of EL rewards that should go to the service (P2P)
• % of EL rewards that should go to the client
• address of the client

Each client gets their own copy of FeeDistributor contract with their own address.

FeeDistributor contract's address is assigned in a validator's setting as EL rewards recipient. Thus, its balance increases over time with each EL reward.

Anyone at any time can call withdraw on the user's own copy of FeeDistributor (See Step 7 above).