### **Dev Update: Week 17**

- I spent time reviewing the recent updates to the [EIP-7732 spec](https://github.com/ethereum/consensus-specs/blob/233afd5a8266fd34af657ee64b560118539da8f2/specs/_features/eip7732/builder.md) and incorporated several of those changes into my implementation. In particular, I added the `ExecutionRequests` container to the existing Electra spec. This container holds requests from the execution layer, received in `ExecutionPayloadV4` via the Engine API, which are essential for the CL state transition. You can find more details about this in the [Electra Beacon Chain spec](https://github.com/ethereum/consensus-specs/blob/7df1ce30384b13d01617f8ddf930f4035da0f689/specs/electra/beacon-chain.md#executionrequests). Specifically, the following were added:
- `deposits` [eip-6110](https://eips.ethereum.org/EIPS/eip-6110)
- `withdrawals` ([eip-7251](https://eips.ethereum.org/EIPS/eip-7251)/[eip-7002](https://eips.ethereum.org/EIPS/eip-7002))
- `consolidations` [eip-7251](https://eips.ethereum.org/EIPS/eip-7251)

Here's the container:

  class ExecutionRequests(Container):
      deposits: List[DepositRequest, MAX_DEPOSIT_REQUESTS_PER_PAYLOAD]  # [New in Electra:EIP6110]
      withdrawals: List[WithdrawalRequest, MAX_WITHDRAWAL_REQUESTS_PER_PAYLOAD]  # [New in Electra:EIP7002:EIP7251]
      consolidations: List[ConsolidationRequest, MAX_CONSOLIDATION_REQUESTS_PER_PAYLOAD]  # [New in Electra:EIP7251]

- I also implemented a change to handle the mutability of the `epochParticipation` structure. Previously, I considered using `var` instead of `let` to allow `epochParticipation` to be mutable, but this approach wouldn't reflect changes back in the state. After exploring various options, I adopted the use of the `unsafeAddr` operator, as described in the [Nim documentation](https://nim-lang.org/docs/manual.html#statements-and-expressions-the-unsafeaddr-operator). This ensures that the `epochParticipation` variable points directly to the underlying state, making any modifications persistent.

Here's the updated code:

  let epoch_participation =
    if state.slot mod SLOTS_PER_EPOCH == 0:
      unsafeAddr state.previous_epoch_participation
    else:
      unsafeAddr state.current_epoch_participation

- Fork choice logic is still pending, but my current focus is on testing the components I've implemented so far. The current test coverage is less than 10%, which is a challenge I'm working through. To address this, I plan to discuss testing strategies with my mentor and explore ways to increase the test coverage while ensuring everything is tested in an integrated manner rather than relying solely on unit tests.

[Full commit](https://github.com/status-im/nimbus-eth2/pull/6443/commits/da6a4767900dae10ae7c79d78f3909b4b2818598)