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Blind Merged Mining with covenants ( sighash_anyprevout / op_ctv )

Update: the content of this gist is also explained in this Spacechains video.

This write-up was also published on bitcoin-dev.

Blind Merged Mining (BMM) is the idea of committing the hash of another blockchain into a unique location on the Bitcoin blockchain, and paying a Bitcoin fee to miners for the privilege of deciding this hash and capturing the fees inside the other blockchain. Since miners don’t have to know what the hash represents and are simply incentivized to choose the highest bidder, it requires no extra validation on their part (“blind”). This idea was originally conceived of by Paul Sztorc, but required a specific soft fork. [0]

In essence, BMM is a mechanism that allows external blockchains (altcoins, tokens) to outsource their mining to the Bitcoin blockchain. Instead of burning electricity with ASICs, th

//Mozilla Public License 2.0 
//As per https://github.com/ethereumjs/ethereumjs-vm/blob/master/LICENSE
//Requires the following packages to run as nodejs file https://gist.github.com/tpmccallum/0e58fc4ba9061a2e634b7a877e60143a

//Getting the requirements
var Trie = require('merkle-patricia-tree/secure');
var levelup = require('levelup');
var leveldown = require('leveldown');
var utils = require('ethereumjs-util');

#Shadowsocks服务端性能优化（CentOS6）

##ss加密算法常用算法aes-256-cfb速度较慢，在路由器等arm平台表现不佳。用于arm平台时，采用算法rc4-md5即可。 "method":"rc4-md5" 为加速加密速度，安装m2crypto

yum install m2crypto

	// SPDX-License-Identifier: GPL-3.0

	pragma solidity >=0.7.0 <0.9.0;
	import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/release-v4.3/contracts/security/ReentrancyGuard.sol";

	contract Attackee is ReentrancyGuard {

	mapping(address => uint) public attackeeBalances;

	function depositIntoAttackee() external payable {

	iPhoneX-test:/usr/local/bin root# apple80211
	apple80211 interface_name [-qvh] -cmd[=new_val]
	-q: Quiet mode. Produce script-friendly output.
	-h: Verbose help.
	-v: Verbose output.
	-40int=[true/false] Get/Set 40 MHz intolerance.
	-2g_chain_disable=[0/1,0/1] Get/Set 2Ghz shared chain disable and reassoc. [disabled,reassoc]
	-acl_add=[mac addr,] Comma separated list of mac addresses to add to ACL list for the interface
	-acl_flush Remove all entries from the ACL list for the interface
	-acl_list List entries in the ACL list for the interface

	package main

	import (
	"bytes"
	"encoding/binary"
	"os"
	"sync"
	"fmt"
	"math/rand"
	"path/filepath"

	package main

	import (
	"github.com/syndtr/goleveldb/leveldb"
	"fmt"
	"encoding/binary"
	"github.com/ethereum/go-ethereum/core/types"
	"bytes"
	"github.com/ethereum/go-ethereum/rlp"
	)

	package main

	import (
	"fmt"
	"crypto/hmac"
	"crypto/sha1"
	"crypto/aes"
	"crypto/cipher"
	"encoding/base64"
	"encoding/hex"

	On Error Resume Next

	' 1. Change this to your Sublime Text file path.
	path = "C:\Program Files\Sublime Text\sublime_text.exe"

	' 2. Optional - Change keyboard shortcut here, for example: "F" if you like.
	shortcut = "Q"

	Sub ElevateUAC
	If Not WScript.Arguments.Named.Exists("elevated") Then

	.markdown-here-wrapper {
	font-size: 16px;
	line-height: 1.8em;
	letter-spacing: 0.1em;
	}


	pre, code {
	font-size: 14px;
	font-family: Roboto, 'Courier New', Consolas, Inconsolata, Courier, monospace;