andreiashu

4.3 The Block

The block in Ethereum is the collection of relevant pieces of information (known as the block header), together with information corresponding to the comprised transactions, and a set of other block headers that are known to have a parent equal to the present block’s parent’s parent (such blocks are known as uncles).

https://sourcegraph.com/github.com/ethereum/go-ethereum@479aa61f11724560c63a7b56084259552892819d/-/blob/core/types/block.go#L139

type Block struct {
	header       *Header
	uncles []*Header

andreiashu

// SPDX-License-Identifier: MIT

pragma solidity 0.8.11;

contract MappingBool {
    
    // NB: if you need to distinguish from nil vs false this method does not work
    mapping(address => bool) entries;

    // gas 44463