text: /*!
   * network.js - bitcoin networks for bcoin
   * Copyright (c) 2014-2015, Fedor Indutny (MIT License)
   * Copyright (c) 2014-2017, Christopher Jeffrey (MIT License).
   * https://github.com/bcoin-org/bcoin
   */
  
  'use strict';
  
  /**
   * @module protocol/networks
   */
  
  const BN = require('bcrypto/lib/bn.js');
  
  const network = exports;
  
  /*
   * Helpers
   */
  
  function b(hash) {
    return Buffer.from(hash, 'hex');
  }
  
  /**
   * Network type list.
   * @memberof module:protocol/networks
   * @const {String[]}
   * @default
   */
  
  network.types = ['main', 'testnet', 'regtest', 'simnet'];
  
  /**
   * Mainnet
   * @static
   * @lends module:protocol/networks
   * @type {Object}
   */
  
  const main = {};
  
  /**
   * Symbolic network type.
   * @const {String}
   * @default
   */
  
  main.type = 'main';
  
  /**
   * Default DNS seeds.
   * @const {String[]}
   * @default
   */
  
  main.seeds = [
    'seed.bitcoin.sipa.be', // Pieter Wuille
    'dnsseed.bluematt.me', // Matt Corallo
    'dnsseed.bitcoin.dashjr.org', // Luke Dashjr
    'seed.bitcoinstats.com', // Christian Decker
    'seed.bitcoin.jonasschnelli.ch', // Jonas Schnelli
    'seed.btc.petertodd.org', // Peter Todd
    'seed.bitcoin.sprovoost.nl', // Sjors Provoost
    'dnsseed.emzy.de' // Stephan Oeste
  ];
  
  /**
   * Packet magic number.
   * @const {Number}
   * @default
   */
  
  main.magic = 0xd9b4bef9;
  
  /**
   * Default network port.
   * @const {Number}
   * @default
   */
  
  main.port = 8333;
  
  /**
   * Checkpoint block list.
   * @const {Object}
   */
  
  main.checkpointMap = {
    11111: b('1d7c6eb2fd42f55925e92efad68b61edd22fba29fde8783df744e26900000000'),
    33333: b('a6d0b5df7d0df069ceb1e736a216ad187a50b07aaa4e78748a58d52d00000000'),
    74000: b('201a66b853f9e7814a820e2af5f5dc79c07144e31ce4c9a39339570000000000'),
    105000: b('97dc6b1d15fbeef373a744fee0b254b0d2c820a3ae7f0228ce91020000000000'),
    134444: b('feb0d2420d4a18914c81ac30f494a5d4ff34cd15d34cfd2fb105000000000000'),
    168000: b('63b703835cb735cb9a89d733cbe66f212f63795e0172ea619e09000000000000'),
    193000: b('17138bca83bdc3e6f60f01177c3877a98266de40735f2a459f05000000000000'),
    210000: b('2e3471a19b8e22b7f939c63663076603cf692f19837e34958b04000000000000'),
    216116: b('4edf231bf170234e6a811460f95c94af9464e41ee833b4f4b401000000000000'),
    225430: b('32595730b165f097e7b806a679cf7f3e439040f750433808c101000000000000'),
    250000: b('14d2f24d29bed75354f3f88a5fb50022fc064b02291fdf873800000000000000'),
    279000: b('407ebde958e44190fa9e810ea1fc3a7ef601c3b0a0728cae0100000000000000'),
    295000: b('83a93246c67003105af33ae0b29dd66f689d0f0ff54e9b4d0000000000000000'),
    300255: b('b2f3a0f0de4120c1089d5f5280a263059f9b6e7c520428160000000000000000'),
    319400: b('3bf115fd057391587ca39a531c5d4989e1adec9b2e05c6210000000000000000'),
    343185: b('548536d48e7678fcfa034202dd45d4a76b1ad061f38b2b070000000000000000'),
    352940: b('ffc9520143e41c94b6e03c2fa3e62bb76b55ba2df45d75100000000000000000'),
    382320: b('b28afdde92b0899715e40362f56afdb20e3d135bedc68d0a0000000000000000'),
    401465: b('eed16cb3e893ed9366f27c39a9ecd95465d02e3ef40e45010000000000000000'),
    420000: b('a1ff746b2d42b834cb7d6b8981b09c265c2cabc016e8cc020000000000000000'),
    440000: b('9bf296b8de5f834f7635d5e258a434ad51b4dbbcf7c08c030000000000000000'),
    450000: b('0ba2070c62cd9da1f8cef88a0648c661a411d33e728340010000000000000000'),
    460000: b('8c25fc7e414d3e868d6ce0ec473c30ad44e7e8bc1b75ef000000000000000000'),
    470000: b('89756d1ed75901437300af10d5ab69070a282e729c536c000000000000000000'),
    480000: b('b1a896fd31e639e0c74d1abeb1dbc93f176b767a5d4c02010000000000000000'),
    490000: b('90dec4d0153f20fbdcb245b1d5fb3d5a8d7bb1379106de000000000000000000'),
    500000: b('045d94a1c33354c3759cc0512dcc49fd81bf4c3637fb24000000000000000000'),
    510000: b('297301b8ca28584cb0c31c7e3fed51696bc33ef8782615000000000000000000'),
    525000: b('1dde8e3fb49bbd5ab66a1b847544d67fff10b108a1fa2f000000000000000000')
  };
  
  /**
   * Last checkpoint height.
   * @const {Number}
   * @default
   */
  
  main.lastCheckpoint = 525000;
  
  /**
   * @const {Number}
   * @default
   */
  
  main.halvingInterval = 210000;
  
  /**
   * Genesis block header.
   * @const {Object}
   */
  
  main.genesis = {
    version: 1,
    hash: b('6fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d6190000000000'),
    prevBlock:
      b('0000000000000000000000000000000000000000000000000000000000000000'),
    merkleRoot:
      b('3ba3edfd7a7b12b27ac72c3e67768f617fc81bc3888a51323a9fb8aa4b1e5e4a'),
    time: 1231006505,
    bits: 486604799,
    nonce: 2083236893,
    height: 0
  };
  
  /**
   * The network's genesis block in a hex string.
   * @const {String}
   */
  
  main.genesisBlock =
    '0100000000000000000000000000000000000000000000000000000000000000000000'
    + '003ba3edfd7a7b12b27ac72c3e67768f617fc81bc3888a51323a9fb8aa4b1e5e4a29ab'
    + '5f49ffff001d1dac2b7c01010000000100000000000000000000000000000000000000'
    + '00000000000000000000000000ffffffff4d04ffff001d0104455468652054696d6573'
    + '2030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66'
    + '207365636f6e64206261696c6f757420666f722062616e6b73ffffffff0100f2052a01'
    + '000000434104678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f'
    + '61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f'
    + 'ac00000000';
  
  /**
   * POW-related constants.
   * @enum {Number}
   * @default
   */
  
  main.pow = {
    /**
     * Default target.
     * @const {BN}
     */
  
    limit: new BN(
      '00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff',
      'hex'
    ),
  
    /**
     * Compact pow limit.
     * @const {Number}
     * @default
     */
  
    bits: 486604799,
  
    /**
     * Minimum chainwork for best chain.
     * @const {BN}
     */
  
    chainwork: new BN(
      '00000000000000000000000000000000000000000259c9b7d8c7779d29a1188f',
      'hex'
    ),
  
    /**
     * Desired retarget period in seconds.
     * @const {Number}
     * @default
     */
  
    targetTimespan: 14 * 24 * 60 * 60,
  
    /**
     * Average block time.
     * @const {Number}
     * @default
     */
  
    targetSpacing: 10 * 60,
  
    /**
     * Retarget interval in blocks.
     * @const {Number}
     * @default
     */
  
    retargetInterval: 2016,
  
    /**
     * Whether to reset target if a block
     * has not been mined recently.
     * @const {Boolean}
     * @default
     */
  
    targetReset: false,
  
    /**
     * Do not allow retargetting.
     * @const {Boolean}
     * @default
     */
  
    noRetargeting: false
  };
  
  /**
   * Block constants.
   * @enum {Number}
   * @default
   */
  
  main.block = {
    /**
     * Height at which bip34 was activated.
     * Used for avoiding bip30 checks.
     */
  
    bip34height: 227931,
  
    /**
     * Hash of the block that activated bip34.
     */
  
    bip34hash:
      b('b808089c756add1591b1d17bab44bba3fed9e02f942ab4894b02000000000000'),
  
    /**
     * Height at which bip65 was activated.
     */
  
    bip65height: 388381,
  
    /**
     * Hash of the block that activated bip65.
     */
  
    bip65hash:
      b('f035476cfaeb9f677c2cdad00fd908c556775ded24b6c2040000000000000000'),
  
    /**
     * Height at which bip66 was activated.
     */
  
    bip66height: 363725,
  
    /**
     * Hash of the block that activated bip66.
     */
  
    bip66hash:
      b('3109b588941188a9f1c2576aae462d729b8cce9da1ea79030000000000000000'),
  
    /**
     * Safe height to start pruning.
     */
  
    pruneAfterHeight: 1000,
  
    /**
     * Safe number of blocks to keep.
     */
  
    keepBlocks: 288,
  
    /**
     * Age used for the time delta to
     * determine whether the chain is synced.
     */
  
    maxTipAge: 24 * 60 * 60,
  
    /**
     * Height at which block processing is
     * slow enough that we can output
     * logs without spamming.
     */
  
    slowHeight: 325000
  };
  
  /**
   * Map of historical blocks which create duplicate transactions hashes.
   * @see https://github.com/bitcoin/bips/blob/master/bip-0030.mediawiki
   * @const {Object}
   * @default
   */
  
  main.bip30 = {
    91842: b('eccae000e3c8e4e093936360431f3b7603c563c1ff6181390a4d0a0000000000'),
    91880: b('21d77ccb4c08386a04ac0196ae10f6a1d2c2a377558ca190f143070000000000')
  };
  
  /**
   * For versionbits.
   * @const {Number}
   * @default
   */
  
  main.activationThreshold = 1916; // 95% of 2016
  
  /**
   * Confirmation window for versionbits.
   * @const {Number}
   * @default
   */
  
  main.minerWindow = 2016; // nPowTargetTimespan / nPowTargetSpacing
  
  /**
   * Deployments for versionbits.
   * @const {Object}
   * @default
   */
  
  main.deployments = {
    csv: {
      name: 'csv',
      bit: 0,
      startTime: 1462060800, // May 1st, 2016
      timeout: 1493596800, // May 1st, 2017
      threshold: -1,
      window: -1,
      required: false,
      force: true
    },
    segwit: {
      name: 'segwit',
      bit: 1,
      startTime: 1479168000, // November 15th, 2016.
      timeout: 1510704000, // November 15th, 2017.
      threshold: -1,
      window: -1,
      required: true,
      force: false
    },
    segsignal: {
      name: 'segsignal',
      bit: 4,
      startTime: 1496275200, // June 1st, 2017.
      timeout: 1510704000, // November 15th, 2017.
      threshold: 269, // 80%
      window: 336, // ~2.33 days
      required: false,
      force: false
    },
    testdummy: {
      name: 'testdummy',
      bit: 28,
      startTime: 1199145601, // January 1, 2008
      timeout: 1230767999, // December 31, 2008
      threshold: -1,
      window: -1,
      required: false,
      force: true
    }
  };
  
  /**
   * Deployments for versionbits (array form, sorted).
   * @const {Array}
   * @default
   */
  
  main.deploys = [
    main.deployments.csv,
    main.deployments.segwit,
    main.deployments.segsignal,
    main.deployments.testdummy
  ];
  
  /**
   * Key prefixes.
   * @enum {Number}
   * @default
   */
  
  main.keyPrefix = {
    privkey: 0x80,
    xpubkey: 0x0488b21e,
    xprivkey: 0x0488ade4,
    xpubkey58: 'xpub',
    xprivkey58: 'xprv',
    coinType: 0
  };
  
  /**
   * {@link Address} prefixes.
   * @enum {Number}
   */
  
  main.addressPrefix = {
    pubkeyhash: 0x00,
    scripthash: 0x05,
    witnesspubkeyhash: 0x06,
    witnessscripthash: 0x0a,
    bech32: 'bc'
  };
  
  /**
   * Default value for whether the mempool
   * accepts non-standard transactions.
   * @const {Boolean}
   * @default
   */
  
  main.requireStandard = true;
  
  /**
   * Default http port.
   * @const {Number}
   * @default
   */
  
  main.rpcPort = 8332;
  
  /**
   * Default wallet port.
   * @const {Number}
   * @default
   */
  
  main.walletPort = 8334;
  
  /**
   * Default min relay rate.
   * @const {Rate}
   * @default
   */
  
  main.minRelay = 1000;
  
  /**
   * Default normal relay rate.
   * @const {Rate}
   * @default
   */
  
  main.feeRate = 5000;
  
  /**
   * Maximum normal relay rate.
   * @const {Rate}
   * @default
   */
  
  main.maxFeeRate = 400000;
  
  /**
   * Whether to allow self-connection.
   * @const {Boolean}
   */
  
  main.selfConnect = false;
  
  /**
   * Whether to request mempool on sync.
   * @const {Boolean}
   */
  
  main.requestMempool = false;
  
  /*
   * Testnet (v3)
   * https://en.bitcoin.it/wiki/Testnet
   */
  
  const testnet = {};
  
  testnet.type = 'testnet';
  
  testnet.seeds = [
    'testnet-seed.bitcoin.jonasschnelli.ch', // Jonas Schnelli
    'seed.tbtc.petertodd.org', // Peter Todd
    'testnet-seed.bluematt.me', // Matt Corallo
    'testnet-seed.bitcoin.schildbach.de', // Andreas Schildbach
    'seed.testnet.bitcoin.sprovoost.nl' // Sjors Provoost
  ];
  
  testnet.magic = 0x0709110b;
  
  testnet.port = 18333;
  
  testnet.checkpointMap = {
    546: b('70cb6af7ebbcb1315d3414029c556c55f3e2fc353c4c9063a76c932a00000000'),
    10000: b('02a1b43f52591e53b660069173ac83b675798e12599dbb0442b7580000000000'),
    50000: b('0c6ceabe803cec55ba2831e445956d0a43ba9521743a802cddac7e0700000000'),
    90000: b('cafc21e17faf90461a5905aa03302c394912651ed9475ae711723e0d00000000'),
    100000: b('1e0a16bbadccde1d80c66597b1939e45f91b570d29f95fc158299e0000000000'),
    140000: b('92c0877b54c556889b72175ccbe0c91a1208f6ef7efb2c006101062300000000'),
    170000: b('508125560d202b89757889bb0e49c712477be20440058f05db4f0e0000000000'),
    210000: b('32365454b5f29a826bff8ad9b0448cad0072fc73d50e482d91a3dece00000000'),
    230000: b('b11a447e62643e0b27406eb0fc270cb8126d7b5b70822fb642d9513400000000'),
    270000: b('1c42b811cf9c163932f6e95ec55bf9b5e2cb5324e7e93001572e000000000000'),
    300000: b('a141bf3972424853f04367b47995e220e0b5a2706e5618766f22000000000000'),
    340000: b('67edd4d92e405608109164b15f92b193377d49325b0ed036739c010000000000'),
    350000: b('592b44bc0f7a4286cf07ead8497114c6952c1c7dea7305193deacf8e00000000'),
    390000: b('f217e183484fb6d695609cc71fa2ae24c3020943407e0150b298030000000000'),
    420000: b('de9e73a3b91fbb014e036e8583a17d6b638a699aeb2de8573d12580800000000'),
    460000: b('2e8baaffc107f15c87aebe01664b63d07476afa53bcbada1281a030000000000'),
    500000: b('06f60922a2aab2757317820fc6ffaf6a470e2cbb0f63a2aac0a7010000000000'),
    540000: b('8dd0bebfbc4878f5af09d3e848dcc57827d2c1cebea8ec5d8cbe420500000000'),
    570000: b('87acbd4cd3c40ec9bd648f8698ed226b31187274c06cc7a9af79030000000000'),
    600000: b('169a05b3bb04b7d13ad628915630900a5ed2e89f3a9dc6064f62000000000000'),
    630000: b('bbbe117035432a6a4effcb297207a02b031735b43e0d19a9217c000000000000'),
    670000: b('080bfe75caed8624fcfdfbc65973c8f962d7bdc495a891f5d16b7d0000000000'),
    700000: b('c14d3f6a1e7c7d66fd940951e44f3c3be1273bea4d2ab1786140000000000000'),
    740000: b('b3b423f0462fd78a01e4f1a59a2737a0525b5dbb9bba0b4634f9000000000000'),
    780000: b('0381582e34c3755964dc2813e2b33e521e5596367144e1670851050000000000'),
    800000: b('03b5f8ab257e02903f509f5ff2935220eec2e77b1819651d099b200000000000'),
    840000: b('dac1648107bd4394e57e4083c86d42b548b1cfb119665f179ea80a0000000000'),
    880000: b('ff90b4bb07eded8e96715bf595c09c7d21dd8c61b8306ff48705d60000000000'),
    900000: b('9bd8ac418beeb1a2cf5d68c8b5c6ebaa947a5b766e5524898d6f350000000000'),
    940000: b('c98f1651a475b00d12f8c25eb166ee843affaa90610e36a19d68030000000000'),
    980000: b('cc8e9774542d044a9698ca2336ae02d5987157e676f1c76aa3877c0000000000'),
    1010000:
      b('9d9fb11abc2712d80368229e97b8d827b2a07d27eb5335e5c924000000000000'),
    1050000: b('d8190cf0af7f08e179cab51d67db0b44b87951a78f7fdc31b4a01a0000000000')
  };
  
  testnet.lastCheckpoint = 1050000;
  
  testnet.halvingInterval = 210000;
  
  testnet.genesis = {
    version: 1,
    hash: b('43497fd7f826957108f4a30fd9cec3aeba79972084e90ead01ea330900000000'),
    prevBlock:
      b('0000000000000000000000000000000000000000000000000000000000000000'),
    merkleRoot:
      b('3ba3edfd7a7b12b27ac72c3e67768f617fc81bc3888a51323a9fb8aa4b1e5e4a'),
    time: 1296688602,
    bits: 486604799,
    nonce: 414098458,
    height: 0
  };
  
  testnet.genesisBlock =
    '0100000000000000000000000000000000000000000000000000000000000000000000'
    + '003ba3edfd7a7b12b27ac72c3e67768f617fc81bc3888a51323a9fb8aa4b1e5e4adae5'
    + '494dffff001d1aa4ae1801010000000100000000000000000000000000000000000000'
    + '00000000000000000000000000ffffffff4d04ffff001d0104455468652054696d6573'
    + '2030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66'
    + '207365636f6e64206261696c6f757420666f722062616e6b73ffffffff0100f2052a01'
    + '000000434104678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f'
    + '61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f'
    + 'ac00000000';
  
  testnet.pow = {
    limit: new BN(
      '00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff',
      'hex'
    ),
    bits: 486604799,
    chainwork: new BN(
      '000000000000000000000000000000000000000000000062b7123cfd7d09f7b6',
      'hex'
    ),
    targetTimespan: 14 * 24 * 60 * 60,
    targetSpacing: 10 * 60,
    retargetInterval: 2016,
    targetReset: true,
    noRetargeting: false
  };
  
  testnet.block = {
    bip34height: 21111,
    bip34hash:
      b('f88ecd9912d00d3f5c2a8e0f50417d3e415c75b3abe584346da9b32300000000'),
    bip65height: 581885,
    bip65hash:
      b('b61e864fbec41dfaf09da05d1d76dc068b0dd82ee7982ff255667f0000000000'),
    bip66height: 330776,
    bip66hash:
      b('82a14b9e5ea81d4832b8e2cd3c2a6092b5a3853285a8995ec4c8042100000000'),
    pruneAfterHeight: 1000,
    keepBlocks: 10000,
    maxTipAge: 24 * 60 * 60,
    slowHeight: 950000
  };
  
  testnet.bip30 = {};
  
  testnet.activationThreshold = 1512; // 75% for testchains
  
  testnet.minerWindow = 2016; // nPowTargetTimespan / nPowTargetSpacing
  
  testnet.deployments = {
    csv: {
      name: 'csv',
      bit: 0,
      startTime: 1456790400, // March 1st, 2016
      timeout: 1493596800, // May 1st, 2017
      threshold: -1,
      window: -1,
      required: false,
      force: true
    },
    segwit: {
      name: 'segwit',
      bit: 1,
      startTime: 1462060800, // May 1st 2016
      timeout: 1493596800, // May 1st 2017
      threshold: -1,
      window: -1,
      required: true,
      force: false
    },
    segsignal: {
      name: 'segsignal',
      bit: 4,
      startTime: 0xffffffff,
      timeout: 0xffffffff,
      threshold: 269,
      window: 336,
      required: false,
      force: false
    },
    testdummy: {
      name: 'testdummy',
      bit: 28,
      startTime: 1199145601, // January 1, 2008
      timeout: 1230767999, // December 31, 2008
      threshold: -1,
      window: -1,
      required: false,
      force: true
    }
  };
  
  testnet.deploys = [
    testnet.deployments.csv,
    testnet.deployments.segwit,
    testnet.deployments.segsignal,
    testnet.deployments.testdummy
  ];
  
  testnet.keyPrefix = {
    privkey: 0xef,
    xpubkey: 0x043587cf,
    xprivkey: 0x04358394,
    xpubkey58: 'tpub',
    xprivkey58: 'tprv',
    coinType: 1
  };
  
  testnet.addressPrefix = {
    pubkeyhash: 0x6f,
    scripthash: 0xc4,
    witnesspubkeyhash: 0x03,
    witnessscripthash: 0x28,
    bech32: 'tb'
  };
  
  testnet.requireStandard = false;
  
  testnet.rpcPort = 18332;
  
  testnet.walletPort = 18334;
  
  testnet.minRelay = 1000;
  
  testnet.feeRate = 20000;
  
  testnet.maxFeeRate = 60000;
  
  testnet.selfConnect = false;
  
  testnet.requestMempool = false;
  
  /*
   * Regtest
   */
  
  const regtest = {};
  
  regtest.type = 'regtest';
  
  regtest.seeds = [];
  
  regtest.magic = 0xdab5bffa;
  
  regtest.port = 48444;
  
  regtest.checkpointMap = {};
  regtest.lastCheckpoint = 0;
  
  regtest.halvingInterval = 150;
  
  regtest.genesis = {
    version: 1,
    hash: b('06226e46111a0b59caaf126043eb5bbf28c34f3a5e332a1fc7b2b73cf188910f'),
    prevBlock:
      b('0000000000000000000000000000000000000000000000000000000000000000'),
    merkleRoot:
      b('3ba3edfd7a7b12b27ac72c3e67768f617fc81bc3888a51323a9fb8aa4b1e5e4a'),
    time: 1296688602,
    bits: 545259519,
    nonce: 2,
    height: 0
  };
  
  regtest.genesisBlock =
    '0100000000000000000000000000000000000000000000000000000000000000000000'
    + '003ba3edfd7a7b12b27ac72c3e67768f617fc81bc3888a51323a9fb8aa4b1e5e4adae5'
    + '494dffff7f200200000001010000000100000000000000000000000000000000000000'
    + '00000000000000000000000000ffffffff4d04ffff001d0104455468652054696d6573'
    + '2030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66'
    + '207365636f6e64206261696c6f757420666f722062616e6b73ffffffff0100f2052a01'
    + '000000434104678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f'
    + '61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f'
    + 'ac00000000';
  
  regtest.pow = {
    limit: new BN(
      '7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff',
      'hex'
    ),
    bits: 545259519,
    chainwork: new BN(
      '0000000000000000000000000000000000000000000000000000000000000002',
      'hex'
    ),
    targetTimespan: 14 * 24 * 60 * 60,
    targetSpacing: 10 * 60,
    retargetInterval: 2016,
    targetReset: true,
    noRetargeting: true
  };
  
  regtest.block = {
    bip34height: 100000000,
    bip34hash: null,
    bip65height: 1351,
    bip65hash: null,
    bip66height: 1251,
    bip66hash: null,
    pruneAfterHeight: 1000,
    keepBlocks: 10000,
    maxTipAge: 0xffffffff,
    slowHeight: 0
  };
  
  regtest.bip30 = {};
  
  regtest.activationThreshold = 108; // 75% for testchains
  
  regtest.minerWindow = 144; // Faster than normal for regtest
  
  regtest.deployments = {
    csv: {
      name: 'csv',
      bit: 0,
      startTime: 0,
      timeout: 0xffffffff,
      threshold: -1,
      window: -1,
      required: false,
      force: true
    },
    segwit: {
      name: 'segwit',
      bit: 1,
      startTime: -1,
      timeout: 0xffffffff,
      threshold: -1,
      window: -1,
      required: true,
      force: false
    },
    segsignal: {
      name: 'segsignal',
      bit: 4,
      startTime: 0xffffffff,
      timeout: 0xffffffff,
      threshold: 269,
      window: 336,
      required: false,
      force: false
    },
    testdummy: {
      name: 'testdummy',
      bit: 28,
      startTime: 0,
      timeout: 0xffffffff,
      threshold: -1,
      window: -1,
      required: false,
      force: true
    }
  };
  
  regtest.deploys = [
    regtest.deployments.csv,
    regtest.deployments.segwit,
    regtest.deployments.segsignal,
    regtest.deployments.testdummy
  ];
  
  regtest.keyPrefix = {
    privkey: 0xef,
    xpubkey: 0x043587cf,
    xprivkey: 0x04358394,
    xpubkey58: 'tpub',
    xprivkey58: 'tprv',
    coinType: 1
  };
  
  regtest.addressPrefix = {
    pubkeyhash: 0x6f,
    scripthash: 0xc4,
    witnesspubkeyhash: 0x03,
    witnessscripthash: 0x28,
    bech32: 'bcrt'
  };
  
  regtest.requireStandard = false;
  
  regtest.rpcPort = 48332;
  
  regtest.walletPort = 48334;
  
  regtest.minRelay = 1000;
  
  regtest.feeRate = 20000;
  
  regtest.maxFeeRate = 60000;
  
  regtest.selfConnect = true;
  
  regtest.requestMempool = true;
  
  /*
   * Simnet (btcd)
   */
  
  const simnet = {};
  
  simnet.type = 'simnet';
  
  simnet.seeds = [
    '127.0.0.1'
  ];
  
  simnet.magic = 0x12141c16;
  
  simnet.port = 18555;
  
  simnet.checkpointMap = {};
  
  simnet.lastCheckpoint = 0;
  
  simnet.halvingInterval = 210000;
  
  simnet.genesis = {
    version: 1,
    hash:
      b('f67ad7695d9b662a72ff3d8edbbb2de0bfa67b13974bb9910d116d5cbd863e68'),
    prevBlock:
      b('0000000000000000000000000000000000000000000000000000000000000000'),
    merkleRoot:
      b('3ba3edfd7a7b12b27ac72c3e67768f617fc81bc3888a51323a9fb8aa4b1e5e4a'),
    time: 1401292357,
    bits: 545259519,
    nonce: 2,
    height: 0
  };
  
  simnet.genesisBlock =
    '0100000000000000000000000000000000000000000000000000000000000000000000'
    + '003ba3edfd7a7b12b27ac72c3e67768f617fc81bc3888a51323a9fb8aa4b1e5e4a4506'
    + '8653ffff7f200200000001010000000100000000000000000000000000000000000000'
    + '00000000000000000000000000ffffffff4d04ffff001d0104455468652054696d6573'
    + '2030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66'
    + '207365636f6e64206261696c6f757420666f722062616e6b73ffffffff0100f2052a01'
    + '000000434104678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f'
    + '61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f'
    + 'ac00000000';
  
  simnet.pow = {
    limit: new BN(
      // High target of 0x207fffff (545259519)
      '7fffff0000000000000000000000000000000000000000000000000000000000',
      'hex'
    ),
    bits: 545259519,
    chainwork: new BN(
      '0000000000000000000000000000000000000000000000000000000000000002',
      'hex'
    ),
    targetTimespan: 14 * 24 * 60 * 60,
    targetSpacing: 10 * 60,
    retargetInterval: 2016,
    targetReset: true,
    noRetargeting: false
  };
  
  simnet.block = {
    bip34height: 0,
    bip34hash:
      b('f67ad7695d9b662a72ff3d8edbbb2de0bfa67b13974bb9910d116d5cbd863e68'),
    bip65height: 0,
    bip65hash:
      b('f67ad7695d9b662a72ff3d8edbbb2de0bfa67b13974bb9910d116d5cbd863e68'),
    bip66height: 0,
    bip66hash:
      b('f67ad7695d9b662a72ff3d8edbbb2de0bfa67b13974bb9910d116d5cbd863e68'),
    pruneAfterHeight: 1000,
    keepBlocks: 10000,
    maxTipAge: 0xffffffff,
    slowHeight: 0
  };
  
  simnet.bip30 = {};
  
  simnet.activationThreshold = 75; // 75% for testchains
  
  simnet.minerWindow = 100; // nPowTargetTimespan / nPowTargetSpacing
  
  simnet.deployments = {
    csv: {
      name: 'csv',
      bit: 0,
      startTime: 0, // March 1st, 2016
      timeout: 0xffffffff, // May 1st, 2017
      threshold: -1,
      window: -1,
      required: false,
      force: true
    },
    segwit: {
      name: 'segwit',
      bit: 1,
      startTime: 0, // May 1st 2016
      timeout: 0xffffffff, // May 1st 2017
      threshold: -1,
      window: -1,
      required: true,
      force: false
    },
    segsignal: {
      name: 'segsignal',
      bit: 4,
      startTime: 0xffffffff,
      timeout: 0xffffffff,
      threshold: 269,
      window: 336,
      required: false,
      force: false
    },
    testdummy: {
      name: 'testdummy',
      bit: 28,
      startTime: 1199145601, // January 1, 2008
      timeout: 1230767999, // December 31, 2008
      threshold: -1,
      window: -1,
      required: false,
      force: true
    }
  };
  
  simnet.deploys = [
    simnet.deployments.csv,
    simnet.deployments.segwit,
    simnet.deployments.segsignal,
    simnet.deployments.testdummy
  ];
  
  simnet.keyPrefix = {
    privkey: 0x64,
    xpubkey: 0x0420bd3a,
    xprivkey: 0x0420b900,
    xpubkey58: 'spub',
    xprivkey58: 'sprv',
    coinType: 115
  };
  
  simnet.addressPrefix = {
    pubkeyhash: 0x3f,
    scripthash: 0x7b,
    witnesspubkeyhash: 0x19,
    witnessscripthash: 0x28,
    bech32: 'sb'
  };
  
  simnet.requireStandard = false;
  
  simnet.rpcPort = 18556;
  
  simnet.walletPort = 18558;
  
  simnet.minRelay = 1000;
  
  simnet.feeRate = 20000;
  
  simnet.maxFeeRate = 60000;
  
  simnet.selfConnect = false;
  
  simnet.requestMempool = false;
  
  /*
   * Expose
   */
  
  network.main = main;
  network.testnet = testnet;
  network.regtest = regtest;
  network.simnet = simnet;
  