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Make lcli testnet genesis use EL withdrawal creds (#1)

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In order for validators to withdraw staked funds, they need withdrawal credentials containing an execution layer address (and `0x01` prefix).
https://lighthouse-book.sigmaprime.io/voluntary-exit.html#1-how-to-know-if-i-have-the-withdrawal-credentials-type-0x01

The current tooling creates validators with credentials derived from a BLS signature using the initial keypair (with `0x00` prefix). To allow withdrawals, these then have to be updated on the running chain in a separate signed message. By creating validators with EL address credentials at genesis, we avoid this extra step.

Reviewed-on: #1
This commit is contained in:
Roy Crihfield 2024-08-05 13:36:00 +00:00
parent f6a60be80e
commit 5801d5dea5
1 changed files with 7 additions and 4 deletions
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11
lcli/src/new_testnet.rs
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@ -258,16 +258,19 @@ fn initialize_state_with_validators<T: EthSpec>(
state.fill_randao_mixes_with(eth1_block_hash); state.fill_randao_mixes_with(eth1_block_hash);
for keypair in keypairs.iter() { for keypair in keypairs.iter() {
let withdrawal_credentials = |pubkey: &PublicKey| { let eth1_withdrawal_credentials = |pubkey: &PublicKey| -> Hash256 {
let mut credentials = hash(&pubkey.as_ssz_bytes()); let fake_execution_address = &hash(&pubkey.as_ssz_bytes())[0..20];
credentials[0] = spec.bls_withdrawal_prefix_byte; let mut credentials = [0u8; 32];
credentials[0] = spec.eth1_address_withdrawal_prefix_byte;
credentials[12..].copy_from_slice(fake_execution_address);
Hash256::from_slice(&credentials) Hash256::from_slice(&credentials)
}; };
let amount = spec.max_effective_balance; let amount = spec.max_effective_balance;
// Create a new validator. // Create a new validator.
let validator = Validator { let validator = Validator {
pubkey: keypair.0.pk.clone().into(), pubkey: keypair.0.pk.clone().into(),
withdrawal_credentials: withdrawal_credentials(&keypair.1.pk), withdrawal_credentials: eth1_withdrawal_credentials(&keypair.1.pk),
activation_eligibility_epoch: spec.far_future_epoch, activation_eligibility_epoch: spec.far_future_epoch,
activation_epoch: spec.far_future_epoch, activation_epoch: spec.far_future_epoch,
exit_epoch: spec.far_future_epoch, exit_epoch: spec.far_future_epoch,