mirrors/mempool
1
0
Fork 0
mirror of https://github.com/mempool/mempool.git synced 2025-03-03 17:47:01 +01:00
Code Issues Projects Releases Wiki Activity

Merge pull request #3576 from mempool/mononaut/fix-difficulty-adjustment

Browse source 
Fix difficulty adjustment bugs
This commit is contained in:
softsimon 2023-03-26 18:02:30 +09:00 • committed by GitHub
commit 6722e45109
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
3 changed files with 19 additions and 17 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

25
backend/src/api/difficulty-adjustment.ts
View file

@ -24,12 +24,11 @@ export function calcDifficultyAdjustment(
network: string,
latestBlockTimestamp: number,
): DifficultyAdjustment {
const ESTIMATE_LAG_BLOCKS = 146; // For first 7.2% of epoch, don't estimate.
const EPOCH_BLOCK_LENGTH = 2016; // Bitcoin mainnet
const BLOCK_SECONDS_TARGET = 600; // Bitcoin mainnet
const TESTNET_MAX_BLOCK_SECONDS = 1200; // Bitcoin testnet
const diffSeconds = nowSeconds - DATime;
const diffSeconds = Math.max(0, nowSeconds - DATime);
const blocksInEpoch = (blockHeight >= 0) ? blockHeight % EPOCH_BLOCK_LENGTH : 0;
const progressPercent = (blockHeight >= 0) ? blocksInEpoch / EPOCH_BLOCK_LENGTH * 100 : 100;
const remainingBlocks = EPOCH_BLOCK_LENGTH - blocksInEpoch;
@ -37,18 +36,16 @@ export function calcDifficultyAdjustment(
const expectedBlocks = diffSeconds / BLOCK_SECONDS_TARGET;
let difficultyChange = 0;
let timeAvgSecs = diffSeconds / blocksInEpoch;
// Only calculate the estimate once we have 7.2% of blocks in current epoch
if (blocksInEpoch >= ESTIMATE_LAG_BLOCKS) {
difficultyChange = (BLOCK_SECONDS_TARGET / timeAvgSecs - 1) * 100;
// Max increase is x4 (+300%)
if (difficultyChange > 300) {
difficultyChange = 300;
}
// Max decrease is /4 (-75%)
if (difficultyChange < -75) {
difficultyChange = -75;
}
let timeAvgSecs = blocksInEpoch ? diffSeconds / blocksInEpoch : BLOCK_SECONDS_TARGET;
difficultyChange = (BLOCK_SECONDS_TARGET / timeAvgSecs - 1) * 100;
// Max increase is x4 (+300%)
if (difficultyChange > 300) {
difficultyChange = 300;
}
// Max decrease is /4 (-75%)
if (difficultyChange < -75) {
difficultyChange = -75;
}
// Testnet difficulty is set to 1 after 20 minutes of no blocks,

9
backend/src/api/websocket-handler.ts
View file

@ -211,6 +211,7 @@ class WebsocketHandler {
if (!_blocks) {
_blocks = blocks.getBlocks().slice(-config.MEMPOOL.INITIAL_BLOCKS_AMOUNT);
}
const da = difficultyAdjustment.getDifficultyAdjustment();
return {
'mempoolInfo': memPool.getMempoolInfo(),
'vBytesPerSecond': memPool.getVBytesPerSecond(),
@ -220,7 +221,7 @@ class WebsocketHandler {
'transactions': memPool.getLatestTransactions(),
'backendInfo': backendInfo.getBackendInfo(),
'loadingIndicators': loadingIndicators.getLoadingIndicators(),
'da': difficultyAdjustment.getDifficultyAdjustment(),
'da': da?.previousTime ? da : undefined,
'fees': feeApi.getRecommendedFee(),
...this.extraInitProperties
};
@ -278,7 +279,9 @@ class WebsocketHandler {
response['mempoolInfo'] = mempoolInfo;
response['vBytesPerSecond'] = vBytesPerSecond;
response['transactions'] = newTransactions.slice(0, 6).map((tx) => Common.stripTransaction(tx));
response['da'] = da;
if (da?.previousTime) {
response['da'] = da;
}
response['fees'] = recommendedFees;
}
@ -505,7 +508,7 @@ class WebsocketHandler {
const response = {
'block': block,
'mempoolInfo': memPool.getMempoolInfo(),
'da': da,
'da': da?.previousTime ? da : undefined,
'fees': fees,
};

2
backend/src/mempool.interfaces.ts
View file

@ -309,9 +309,11 @@ export interface IDifficultyAdjustment {
remainingBlocks: number;
remainingTime: number;
previousRetarget: number;
previousTime: number;
nextRetargetHeight: number;
timeAvg: number;
timeOffset: number;
expectedBlocks: number;
}
export interface IndexedDifficultyAdjustment {