awemany

Solving the 0-conf problem using forfeits

by /u/awemany

Overview

The problem of ensuring good security for unconfirmed transactions in Bitcoin is repeatedly discussed in the community. Right now these so-called 0-conf transactions are usually expected to be of low risk in the case of small amounts and face-to-face interaction of merchant and customer.

dymurray

import ecdsa
import ecdsa.ellipticcurve as EC

curve = ecdsa.SECP256k1
x = int('11db93e1dcdb8a016b49840f8c53bc1eb68a382e97b1482ecad7b148a6909a5c', 16)
y = int('b2e0eaddfb84ccf9744464f82e160bfa9b8b64f9d4c03f999b8643f656b412a3', 16)
point = EC.Point(curve.curve, x, y)
pubkey = ecdsa.VerifyingKey.from_public_point(point, curve)

hash1 = 90774958364900180671716888080665726921328827653065727390791155349203800699667

shilch

#include "merkle.h"

#include <assert.h>
#include <string.h>
#include <stdio.h>

void merkle_init(merkle_ctx* ctx){
    ctx->size = 0;
    ctx->mutated = false;
}

dino-

#! /usr/bin/env stack
-- stack --resolver lts-18.8 script

{-# LANGUAGE OverloadedStrings #-}

{-
This is a handy illustration of converting between five of the commonly-used
string types in Haskell (String, ByteString, lazy ByteString, Text and lazy
Text).

KtorZ

name: Code Style

on:
  pull_request:
    branches: [ "master" ]
  push:
    branches: [ "master" ]
    tags: [ "*.*.*" ]

jobs:

zhangweis

import "util.scrypt";

contract Token {
    public function transfer(bytes txPreimage, bytes fromRecord, bytes fromMerklePath, Sig senderSig, 
        bytes toRecord, bytes toMerklePath, bytes insertPoint, bytes insertPointMerklePath,
		int amount, int utxoAmount) {
        require(amount>0);
        require(utxoAmount>=0);
        // this ensures the preimage is for the current tx
		require(Tx.checkPreimage(txPreimage));

synfonaut

Bitcoin SV Stable Protocol Restoration

These are the pending changes to Bitcoin SV's stable protocol — many of these were changed/removed by BTC/BCH and are being restored carefully or in ways that fix the original issues. Other changes are primarily scaling parameters or optimizations.

Remove dust limit & 0-satoshi utxos

Once upon a time some BTC developers, mindful of their parental responsibilities to all participants in the Bitcoin network, introduced a protective mechanism called the Dust limit

This limit will be removed entirely by the end of the year allowing even 0 value outputs.

RobinLinus

Covenants

Covenant-enabling Bitcoin Features

• BIP119: CHECKTEMPLATEVERIFY (CTV) by Jeremy Rubin
• BIP118: SIGHASH_ANYPREVOUT (APO) (aka SIGHASH_NOINPUT) by Christian Decker and Anthony Towns
• OP_CAT by Andrew Poelstra
• OP_CHECKSIGFROMSTACK (CSFS) + OP_CAT
• OP_TAPLEAF_UPDATE_VERIFY (TLUV) by Anthony Towns
• TXHASH + CHECKSIGFROMSTACKVERIFY (TXHASH + CSFS) by Russel O'Connor
• OP_EVICT by ZmnSCPxj

RobinLinus

Raw Bitcoin Transactions

P2PK

https://blockstream.info/block/00000000d1145790a8694403d4063f323d499e655c83426834d4ce2f8dd4a2ee

Raw

https://blockstream.info/tx/f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16

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

Parsed

revofusion

/**
  Convert between rune symbols and values using Base 26 (A=1)
  Similar rust implementation at https://github.com/ordinals/ord/blob/f3cae5400fdebf31bfd494a02c846a90ea12310d/src/sat.rs#L63
*/

class Rune {
  constructor(public value: number) { }

  public get name(): string {
      let x = this.value;