educationofjon

01000000                                                                 - version
0000000000000000000000000000000000000000000000000000000000000000         - prevblock
8a6be158deb38d5cc20aa8612ac303bb7ae59520d3b22213df5e88434f36b18e         - merkleblock
2d87ce6000000000000000000000000000000000000000000000000000000000         - withdrawalBundle
0000000000000000000000000000000000000000000000000000000000000000         - mainchainBlock
00000000                                                                 - timestamp
ffff7f20                                                                 - bits
02000000                                                                 - nonce
01                                                                       - number of tx
01000000                                                                 - version

educationofjon

/*!
 * sidechain.js - a sidechain template for bitcoin
 * Copyright (C) 2023, Jonathan Gonzalies (MIT License).
 * https://github.com/rojii/sidechain
 */

'use strict';

const assert = require('bsert');
const layout = require('./blockchain/layout');

educationofjon

'use strict';

const assert = require('bsert');
const EventEmitter = require('events');
const WEB3 = require('web3-eth');
const {endpoint} = require('./constants');

/**

educationofjon

'use strict';

const assert = require('assert');
const bcoin = require('bcoin');

const MTX = bcoin.MTX;
const Keyring = bcoin.wallet.WalletKey;
const Outpoint = bcoin.Outpoint;
const Script = bcoin.Script;
const Coin = bcoin.Coin;

educationofjon

0x42C6A98F84fec35d50c0188989817d5A535bB214

educationofjon

/* eslint-env mocha */

'use strict';

const {NodeClient, WalletClient} = require('../lib/client');
const assert = require('bsert');
const consensus = require('../lib/protocol/consensus');
const FullNode = require('../lib/node/fullnode');
const Network = require('../lib/protocol/network');
const Mnemonic = require('../lib/hd/mnemonic');

educationofjon

var alnilam = Number.EPSILON * illai * 0.4503599627370496

var e = Number.EPSILON * 2 ** 52;

educationofjon

Covert ECDH over secp256k1

If ECDH is used to establish a shared session secret for an encrypted connection, two elliptic curve points need to be transmitted (one in each direction) before encryption starts. In order to avoid being identifiable as a (specific) ECDH negotiation, ideally those two points are sent in a way that is indistinguishable from random.

This problem is easily addressed by using curves that support Elligator-style encodings: functions that encode a (subset of) elliptic curve points as sequences of bytes with no observable bias: (almost) every byte sequence corresponds to exactly one point, and the others correspond to none.

Unfortunately, no Elligator-style encoding is known for secp256k1.

educationofjon

var pop8tab = [256]uint8{
	0x00, 0x01, 0x01, 0x02, 0x01, 0x02, 0x02, 0x03, 0x01, 0x02, 0x02, 0x03, 0x02, 0x03, 0x03, 0x04,
	0x01, 0x02, 0x02, 0x03, 0x02, 0x03, 0x03, 0x04, 0x02, 0x03, 0x03, 0x04, 0x03, 0x04, 0x04, 0x05,
	0x01, 0x02, 0x02, 0x03, 0x02, 0x03, 0x03, 0x04, 0x02, 0x03, 0x03, 0x04, 0x03, 0x04, 0x04, 0x05,
	0x02, 0x03, 0x03, 0x04, 0x03, 0x04, 0x04, 0x05, 0x03, 0x04, 0x04, 0x05, 0x04, 0x05, 0x05, 0x06,
	0x01, 0x02, 0x02, 0x03, 0x02, 0x03, 0x03, 0x04, 0x02, 0x03, 0x03, 0x04, 0x03, 0x04, 0x04, 0x05,
	0x02, 0x03, 0x03, 0x04, 0x03, 0x04, 0x04, 0x05, 0x03, 0x04, 0x04, 0x05, 0x04, 0x05, 0x05, 0x06,
	0x02, 0x03, 0x03, 0x04, 0x03, 0x04, 0x04, 0x05, 0x03, 0x04, 0x04, 0x05, 0x04, 0x05, 0x05, 0x06,
	0x03, 0x04, 0x04, 0x05, 0x04, 0x05, 0x05, 0x06, 0x04, 0x05, 0x05, 0x06, 0x05, 0x06, 0x06, 0x07,
	0x01, 0x02, 0x02, 0x03, 0x02, 0x03, 0x03, 0x04, 0x02, 0x03, 0x03, 0x04, 0x03, 0x04, 0x04, 0x05,

educationofjon

[
["Format is: [[wit..., amount]?, scriptSig, scriptPubKey, flags, expected_scripterror, ... comments]"],
["It is evaluated as if there was a crediting coinbase transaction with two 0"],
["pushes as scriptSig, and one output of 0 satoshi and given scriptPubKey,"],
["followed by a spending transaction which spends this output as only input (and"],
["correct prevout hash), using the given scriptSig. All nLockTimes are 0, all"],
["nSequences are max."],

["", "DEPTH 0 EQUAL", "P2SH,STRICTENC", "OK", "Test the test: we should have an empty stack after scriptSig evaluation"],
["  ", "DEPTH 0 EQUAL", "P2SH,STRICTENC", "OK", "and multiple spaces should not change that."],