返回比特幣網絡上完整節點IP地址的DNS服務器，用於協助發現節點。html
咱們在bitcoinj庫中，params文件夾內爲網絡相關的配置文件java
打開文件MainNetParams，查看文件內容node
/* * Copyright 2013 Google Inc. * Copyright 2015 Andreas Schildbach * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.bitcoinj.params; import org.bitcoinj.core.*; import org.bitcoinj.net.discovery.*; import java.net.*; import static com.google.common.base.Preconditions.*; /** * Parameters for the main production network on which people trade goods and services. */ public class MainNetParams extends AbstractBitcoinNetParams { public static final int MAINNET_MAJORITY_WINDOW = 1000; public static final int MAINNET_MAJORITY_REJECT_BLOCK_OUTDATED = 950; public static final int MAINNET_MAJORITY_ENFORCE_BLOCK_UPGRADE = 750; public MainNetParams() { super(); interval = INTERVAL; targetTimespan = TARGET_TIMESPAN; maxTarget = Utils.decodeCompactBits(0x1d00ffffL); dumpedPrivateKeyHeader = 128; addressHeader = 0; p2shHeader = 5; acceptableAddressCodes = new int[] { addressHeader, p2shHeader }; port = 8333; packetMagic = 0xf9beb4d9L; bip32HeaderPub = 0x0488B21E; //The 4 byte header that serializes in base58 to "xpub". bip32HeaderPriv = 0x0488ADE4; //The 4 byte header that serializes in base58 to "xprv" majorityEnforceBlockUpgrade = MAINNET_MAJORITY_ENFORCE_BLOCK_UPGRADE; majorityRejectBlockOutdated = MAINNET_MAJORITY_REJECT_BLOCK_OUTDATED; majorityWindow = MAINNET_MAJORITY_WINDOW; genesisBlock.setDifficultyTarget(0x1d00ffffL); genesisBlock.setTime(1231006505L); genesisBlock.setNonce(2083236893); id = ID_MAINNET; subsidyDecreaseBlockCount = 210000; spendableCoinbaseDepth = 100; String genesisHash = genesisBlock.getHashAsString(); checkState(genesisHash.equals("000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f"), genesisHash); // This contains (at a minimum) the blocks which are not BIP30 compliant. BIP30 changed how duplicate // transactions are handled. Duplicated transactions could occur in the case where a coinbase had the same // extraNonce and the same outputs but appeared at different heights, and greatly complicated re-org handling. // Having these here simplifies block connection logic considerably. checkpoints.put(91722, Sha256Hash.wrap("00000000000271a2dc26e7667f8419f2e15416dc6955e5a6c6cdf3f2574dd08e")); checkpoints.put(91812, Sha256Hash.wrap("00000000000af0aed4792b1acee3d966af36cf5def14935db8de83d6f9306f2f")); checkpoints.put(91842, Sha256Hash.wrap("00000000000a4d0a398161ffc163c503763b1f4360639393e0e4c8e300e0caec")); checkpoints.put(91880, Sha256Hash.wrap("00000000000743f190a18c5577a3c2d2a1f610ae9601ac046a38084ccb7cd721")); checkpoints.put(200000, Sha256Hash.wrap("000000000000034a7dedef4a161fa058a2d67a173a90155f3a2fe6fc132e0ebf")); dnsSeeds = new String[] { "seed.bitcoin.sipa.be", // Pieter Wuille "dnsseed.bluematt.me", // Matt Corallo "dnsseed.bitcoin.dashjr.org", // Luke Dashjr "seed.bitcoinstats.com", // Chris Decker "seed.bitnodes.io", // Addy Yeow "bitseed.xf2.org", // Jeff Garzik "seed.bitcoin.jonasschnelli.ch",// Jonas Schnelli "bitcoin.bloqseeds.net", // Bloq }; httpSeeds = new HttpDiscovery.Details[] { // Andreas Schildbach new HttpDiscovery.Details( ECKey.fromPublicOnly(Utils.HEX.decode("0238746c59d46d5408bf8b1d0af5740fe1a6e1703fcb56b2953f0b965c740d256f")), URI.create("http://httpseed.bitcoin.schildbach.de/peers") ) }; addrSeeds = new int[] { 0x1ddb1032, 0x6242ce40, 0x52d6a445, 0x2dd7a445, 0x8a53cd47, 0x73263750, 0xda23c257, 0xecd4ed57, 0x0a40ec59, 0x75dce160, 0x7df76791, 0x89370bad, 0xa4f214ad, 0x767700ae, 0x638b0418, 0x868a1018, 0xcd9f332e, 0x0129653e, 0xcc92dc3e, 0x96671640, 0x56487e40, 0x5b66f440, 0xb1d01f41, 0xf1dc6041, 0xc1d12b42, 0x86ba1243, 0x6be4df43, 0x6d4cef43, 0xd18e0644, 0x1ab0b344, 0x6584a345, 0xe7c1a445, 0x58cea445, 0xc5daa445, 0x21dda445, 0x3d3b5346, 0x13e55347, 0x1080d24a, 0x8e611e4b, 0x81518e4b, 0x6c839e4b, 0xe2ad0a4c, 0xfbbc0a4c, 0x7f5b6e4c, 0x7244224e, 0x1300554e, 0x20690652, 0x5a48b652, 0x75c5c752, 0x4335cc54, 0x340fd154, 0x87c07455, 0x087b2b56, 0x8a133a57, 0xac23c257, 0x70374959, 0xfb63d45b, 0xb9a1685c, 0x180d765c, 0x674f645d, 0x04d3495e, 0x1de44b5e, 0x4ee8a362, 0x0ded1b63, 0xc1b04b6d, 0x8d921581, 0x97b7ea82, 0x1cf83a8e, 0x91490bad, 0x09dc75ae, 0x9a6d79ae, 0xa26d79ae, 0x0fd08fae, 0x0f3e3fb2, 0x4f944fb2, 0xcca448b8, 0x3ecd6ab8, 0xa9d5a5bc, 0x8d0119c1, 0x045997d5, 0xca019dd9, 0x0d526c4d, 0xabf1ba44, 0x66b1ab55, 0x1165f462, 0x3ed7cbad, 0xa38fae6e, 0x3bd2cbad, 0xd36f0547, 0x20df7840, 0x7a337742, 0x549f8e4b, 0x9062365c, 0xd399f562, 0x2b5274a1, 0x8edfa153, 0x3bffb347, 0x7074bf58, 0xb74fcbad, 0x5b5a795b, 0x02fa29ce, 0x5a6738d4, 0xe8a1d23e, 0xef98c445, 0x4b0f494c, 0xa2bc1e56, 0x7694ad63, 0xa4a800c3, 0x05fda6cd, 0x9f22175e, 0x364a795b, 0x536285d5, 0xac44c9d4, 0x0b06254d, 0x150c2fd4, 0x32a50dcc, 0xfd79ce48, 0xf15cfa53, 0x66c01e60, 0x6bc26661, 0xc03b47ae, 0x4dda1b81, 0x3285a4c1, 0x883ca96d, 0x35d60a4c, 0xdae09744, 0x2e314d61, 0x84e247cf, 0x6c814552, 0x3a1cc658, 0x98d8f382, 0xe584cb5b, 0x15e86057, 0x7b01504e, 0xd852dd48, 0x56382f56, 0x0a5df454, 0xa0d18d18, 0x2e89b148, 0xa79c114c, 0xcbdcd054, 0x5523bc43, 0xa9832640, 0x8a066144, 0x3894c3bc, 0xab76bf58, 0x6a018ac1, 0xfebf4f43, 0x2f26c658, 0x31102f4e, 0x85e929d5, 0x2a1c175e, 0xfc6c2cd1, 0x27b04b6d, 0xdf024650, 0x161748b8, 0x28be6580, 0x57be6580, 0x1cee677a, 0xaa6bb742,