go-ethereum 코드 분석(1) - PoW Reward

https://geth.ethereum.org/

github: https://github.com/ethereum/go-ethereum

GitHub - ethereum/go-ethereum: Official Go implementation of the Ethereum protocol

 

소스위치

consensus/ethash/consensus.go

 

설명

- 하드포크가 일어난 지점에서 리워드를 어떻게 변경 시켰는지 해당 부분에서 확인할 수 있습니다.

- 블록 생성시 리워드가 5 -> 3  -> 2로 줄어들었던 것이 확인됩니다. (math/big을 import 하여 18승을 표현하였습니다)

- 엉클블록의 최대 개수는 2개 입니다.

- allowedFutureBlockTimeSeconds 는 다음 블록이 생성될 때 최대 15초 내에 생성되야 함을 확인할 수 있습니다. 이 아래보다 더 빨리 생성되는 경우가 많이 생기면 난이도가 조절 됩니다. 

- 현재 이더리움 2.0에서는 PoW -> PoS로 변경되어 ethash(이대시) 알고리즘은 더 이상 사용되지는 않습니다.

import (
	"errors"
	"fmt"
	"math/big"
...
)

...

// Ethash proof-of-work protocol constants.
var (
	FrontierBlockReward           = big.NewInt(5e+18) // Block reward in wei for successfully mining a block
	ByzantiumBlockReward          = big.NewInt(3e+18) // Block reward in wei for successfully mining a block upward from Byzantium
	ConstantinopleBlockReward     = big.NewInt(2e+18) // Block reward in wei for successfully mining a block upward from Constantinople
	maxUncles                     = 2                 // Maximum number of uncles allowed in a single block
	allowedFutureBlockTimeSeconds = int64(15)         // Max seconds from current time allowed for blocks, before they're considered future blocks

	// calcDifficultyEip5133 is the difficulty adjustment algorithm as specified by EIP 5133.
	// It offsets the bomb a total of 11.4M blocks.
	// Specification EIP-5133: https://eips.ethereum.org/EIPS/eip-5133
	calcDifficultyEip5133 = makeDifficultyCalculator(big.NewInt(11_400_000))

	// calcDifficultyEip4345 is the difficulty adjustment algorithm as specified by EIP 4345.
	// It offsets the bomb a total of 10.7M blocks.
	// Specification EIP-4345: https://eips.ethereum.org/EIPS/eip-4345
	calcDifficultyEip4345 = makeDifficultyCalculator(big.NewInt(10_700_000))

	// calcDifficultyEip3554 is the difficulty adjustment algorithm as specified by EIP 3554.
	// It offsets the bomb a total of 9.7M blocks.
	// Specification EIP-3554: https://eips.ethereum.org/EIPS/eip-3554
	calcDifficultyEip3554 = makeDifficultyCalculator(big.NewInt(9700000))

	// calcDifficultyEip2384 is the difficulty adjustment algorithm as specified by EIP 2384.
	// It offsets the bomb 4M blocks from Constantinople, so in total 9M blocks.
	// Specification EIP-2384: https://eips.ethereum.org/EIPS/eip-2384
	calcDifficultyEip2384 = makeDifficultyCalculator(big.NewInt(9000000))

	// calcDifficultyConstantinople is the difficulty adjustment algorithm for Constantinople.
	// It returns the difficulty that a new block should have when created at time given the
	// parent block's time and difficulty. The calculation uses the Byzantium rules, but with
	// bomb offset 5M.
	// Specification EIP-1234: https://eips.ethereum.org/EIPS/eip-1234
	calcDifficultyConstantinople = makeDifficultyCalculator(big.NewInt(5000000))

	// calcDifficultyByzantium is the difficulty adjustment algorithm. It returns
	// the difficulty that a new block should have when created at time given the
	// parent block's time and difficulty. The calculation uses the Byzantium rules.
	// Specification EIP-649: https://eips.ethereum.org/EIPS/eip-649
	calcDifficultyByzantium = makeDifficultyCalculator(big.NewInt(3000000))
)

...