/// <summary>
/// Return the beacon proposer index at the current slot.
/// </summary>
public ValidatorIndex GetBeaconProposerIndex(BeaconState state)
{
Epoch epoch = GetCurrentEpoch(state);
Span <byte> seedBytes = stackalloc byte[40];
Bytes32 initialSeed = GetSeed(state, epoch, _signatureDomainOptions.CurrentValue.BeaconProposer);
initialSeed.AsSpan().CopyTo(seedBytes);
BinaryPrimitives.WriteUInt64LittleEndian(seedBytes.Slice(32), state.Slot);
Bytes32 seed = _cryptographyService.Hash(seedBytes);
IList <ValidatorIndex> indices = GetActiveValidatorIndices(state, epoch);
ValidatorIndex proposerIndex = _beaconChainUtility.ComputeProposerIndex(state, indices, seed);
return(proposerIndex);
}