eth2

type BeaconState interface {
	GetSlot() uint64
	ValidatorAndSlotProof(validatorIndex uint64) (validatorProof [][]byte, slotProof [][]byte, err error)
	HistoricalSummaryProof(slot uint64, capellaOffset uint64) ([][]byte, error)
	HistoricalSummaryBlockRootProof(slot int) ([][]byte, error)
	HistoricalSummaryStateRootProof(slot int) ([][]byte, error)
	BlockRootProof(slot uint64) ([][]byte, error)
	StateRootProof(slot uint64) ([][]byte, error)
	BlockHeaderProof() ([][]byte, error)
	GetValidators() []*generic.Validator
	GetPreviousEpochParticipation() []byte
	// PreviousEpochParticipationChunkProof proves the previous_epoch_participation
	// chunk containing validatorIndex's flags up to the state root (no
	// block-header cap). chunk is the 32-byte merkle leaf; the validator's flags
	// are at byte validatorIndex % 32 within it
	PreviousEpochParticipationChunkProof(validatorIndex uint64) (chunk [32]byte, participationProofBytes [][]byte, err error)
}

type SignedBeaconBlock interface {
	ProveWithdrawal(indexInWithdrawalsArray uint64) ([][]byte, error)
	HasExecutionPayload() bool
	Withdrawals() []*generic.Withdrawal
}