btc-rpc-explorer/app/coins/btc.js

var Decimal = require("decimal.js");
Decimal8 = Decimal.clone({ precision:8, rounding:8 });

var currencyUnits = [
	{
		type:"native",
		name:"BTC",
		multiplier:1,
		default:true,
		values:["", "btc", "BTC"],
		decimalPlaces:8
	},
	{
		type:"native",
		name:"mBTC",
		multiplier:1000,
		values:["mbtc"],
		decimalPlaces:5
	},
	{
		type:"native",
		name:"bits",
		multiplier:1000000,
		values:["bits"],
		decimalPlaces:2
	},
	{
		type:"native",
		name:"sat",
		multiplier:100000000,
		values:["sat", "satoshi"],
		decimalPlaces:0
	},
	{
		type:"exchanged",
		name:"USD",
		multiplier:"usd",
		values:["usd"],
		decimalPlaces:2,
		symbol:"$"
	},
	{
		type:"exchanged",
		name:"EUR",
		multiplier:"eur",
		values:["eur"],
		decimalPlaces:2,
		symbol:"€"
	},
];

module.exports = {
	name:"Bitcoin",
	ticker:"BTC",
	logoUrl:"/img/logo/btc.svg",
	siteTitle:"Bitcoin Explorer",
	siteDescriptionHtml:"<b>BTC Explorer</b> is <a href='https://github.com/janoside/btc-rpc-explorer). If you run your own [Bitcoin Full Node](https://bitcoin.org/en/full-node), **BTC Explorer** can easily run alongside it, communicating via RPC calls. See the project [ReadMe](https://github.com/janoside/btc-rpc-explorer) for a list of features and instructions for running.",
	nodeTitle:"Bitcoin Full Node",
	nodeUrl:"https://bitcoin.org/en/full-node",
	demoSiteUrl: "https://btc.chaintools.io",
	miningPoolsConfigUrls:[
		"https://raw.githubusercontent.com/btccom/Blockchain-Known-Pools/master/pools.json",
		"https://raw.githubusercontent.com/blockchain/Blockchain-Known-Pools/master/pools.json"
	],
	maxBlockWeight: 4000000,
	targetBlockTimeSeconds: 600,
	currencyUnits:currencyUnits,
	currencyUnitsByName:{"BTC":currencyUnits[0], "mBTC":currencyUnits[1], "bits":currencyUnits[2], "sat":currencyUnits[3]},
	baseCurrencyUnit:currencyUnits[3],
	defaultCurrencyUnit:currencyUnits[0],
	feeSatoshiPerByteBucketMaxima: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 50, 75, 100, 150],
	genesisBlockHash: "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f",
	genesisCoinbaseTransactionId: "4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b",
	genesisCoinbaseTransaction: {
		"hex": "01000000010000000000000000000000000000000000000000000000000000000000000000ffffffff0804ffff001d02fd04ffffffff0100f2052a01000000434104f5eeb2b10c944c6b9fbcfff94c35bdeecd93df977882babc7f3a2cf7f5c81d3b09a68db7f0e04f21de5d4230e75e6dbe7ad16eefe0d4325a62067dc6f369446aac00000000",
		"txid": "4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b",
		"hash": "4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b",
		"size": 204,
		"vsize": 204,
		"version": 1,
		"confirmations":475000,
		"vin": [
			{
				"coinbase": "04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73",
				"sequence": 4294967295
			}
		],
		"vout": [
			{
				"value": 50,
				"n": 0,
				"scriptPubKey": {
					"asm": "04f5eeb2b10c944c6b9fbcfff94c35bdeecd93df977882babc7f3a2cf7f5c81d3b09a68db7f0e04f21de5d4230e75e6dbe7ad16eefe0d4325a62067dc6f369446a OP_CHECKSIG",
					"hex": "4104f5eeb2b10c944c6b9fbcfff94c35bdeecd93df977882babc7f3a2cf7f5c81d3b09a68db7f0e04f21de5d4230e75e6dbe7ad16eefe0d4325a62067dc6f369446aac",
					"reqSigs": 1,
					"type": "pubkey",
					"addresses": [
						"1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa"
					]
				}
			}
		],
		"blockhash": "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f",
		"time": 1230988505,
		"blocktime": 1230988505
	},
	genesisCoinbaseOutputAddressScripthash:"8b01df4e368ea28f8dc0423bcf7a4923e3a12d307c875e47a0cfbf90b5c39161",
	historicalData: [
		{
			type: "blockheight",
			date: "2009-01-03",
			blockHeight: 0,
			blockHash: "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f",
			summary: "The Bitcoin Genesis Block.",
			alertBodyHtml: "This is the first block in the Bitcoin blockchain, known as the 'Genesis Block'. This block was mined by Bitcoin's creator Satoshi Nakamoto. You can read more about <a href='https://en.bitcoin.it/wiki/Genesis_block'>the genesis block</a>.",
			referenceUrl: "https://en.bitcoin.it/wiki/Genesis_block"
		},
		{
			type: "tx",
			date: "2009-01-03",
			txid: "4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b",
			summary: "The coinbase transaction of the Genesis Block.",
			alertBodyHtml: "This transaction doesn't really exist! This is the coinbase transaction of the <a href='/block/000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f'>Bitcoin Genesis Block</a>. For more background about this special-case transaction, you can read <a href='https://github.com/bitcoin/bitcoin/issues/3303'>this brief discussion</a> among some of the <a href='https://bitcoin.org'>Bitcoin</a> developers.",
			referenceUrl: "https://github.com/bitcoin/bitcoin/issues/3303"
		},
		{
			type: "tx",
			date: "2009-10-12",
			txid: "7dff938918f07619abd38e4510890396b1cef4fbeca154fb7aafba8843295ea2",
			summary: "First bitcoin traded for fiat currency.",
			alertBodyHtml: "In this first-known BTC-to-fiat transaction, 5,050 BTC were exchanged for 5.02 USD, at an effective exchange rate of ~0.001 USD/BTC.",
			referenceUrl: "https://twitter.com/marttimalmi/status/423455561703624704"
		},
		{
			type: "blockheight",
			date: "2017-08-24",
			blockHeight: 481824,
			blockHash: "0000000000000000001c8018d9cb3b742ef25114f27563e3fc4a1902167f9893",
			summary: "First SegWit block.",
			referenceUrl: "https://twitter.com/conio/status/900722226911219712"
		},
		{
			type: "tx",
			date: "2017-08-24",
			txid: "8f907925d2ebe48765103e6845C06f1f2bb77c6adc1cc002865865eb5cfd5c1c",
			summary: "First SegWit transaction.",
			referenceUrl: "https://twitter.com/KHS9NE/status/900553902923362304"
		},
		{
			type: "tx",
			date: "2014-06-16",
			txid: "143a3d7e7599557f9d63e7f224f34d33e9251b2c23c38f95631b3a54de53f024",
			summary: "Star Wars: A New Hope",
			referenceUrl: ""
		},
		{
			type: "tx",
			date: "2010-05-22",
			txid: "a1075db55d416d3ca199f55b6084e2115b9345e16c5cf302fc80e9d5fbf5d48d",
			summary: "The 'Bitcoin Pizza' transaction.",
			alertBodyHtml: "This is the famous 'Bitcoin Pizza' transaction.",
			referenceUrl: "https://bitcointalk.org/index.php?topic=137.0"
		},
		{
			type: "tx",
			date: "2011-05-18",
			txid: "5d80a29be1609db91658b401f85921a86ab4755969729b65257651bb9fd2c10d",
			summary: "Destroyed bitcoin.",
			referenceUrl: "https://www.reddit.com/r/Bitcoin/comments/7mhoks/til_in_2011_a_user_running_a_modified_mining/"
		},
		{
			type: "blockheight",
			date: "2009-01-12",
			blockHeight: 170,
			blockHash: "00000000d1145790a8694403d4063f323d499e655c83426834d4ce2f8dd4a2ee",
			summary: "First block containing a (non-coinbase) transaction.",
			alertBodyHtml: "This block comes 9 days after the genesis block and is the first to contain a transfer of bitcoin. Before this block all blocks contained only coinbase transactions which mint new bitcoin.",
			referenceUrl: "https://bitcointalk.org/index.php?topic=91806.msg1012234#msg1012234"
		},
		{
			type: "blockheight",
			date: "2017-08-25",
			blockHeight: 481947,
			blockHash: "00000000000000000139cb443e16442fcd07a4a0e0788dd045ee3cf268982016",
			summary: "First block mined that was greater than 1MB.",
			referenceUrl: "https://en.bit.news/bitfury-mined-first-segwit-block-size-1-mb/"
		},
		{
			type: "blockheight",
			date: "2018-01-20",
			blockHeight: 505225,
			blockHash: "0000000000000000001bbb529c64ddf55edec8f4ebc0a0ccf1d3bb21c278bfa7",
			summary: "First block mined that was greater than 2MB.",
			referenceUrl: "https://twitter.com/BitGo/status/954998877920247808"
		},
		{
			type: "tx",
			date: "2017-12-30",
			txid: "9bf8853b3a823bbfa1e54017ae11a9e1f4d08a854dcce9f24e08114f2c921182",
			summary: "Block reward lost",
			alertBodyHtml: "This coinbase transaction completely fails to collect the block's mining reward. 12.5 BTC were lost.",
			referenceUrl: "https://bitcoin.stackexchange.com/a/67012/3397"
		},
		{
			type:"address",
			date:"2011-12-03",
			address:"1JryTePceSiWVpoNBU8SbwiT7J4ghzijzW",
			summary:"Brainwallet address for 'Satoshi Nakamoto'",
			referenceUrl:"https://twitter.com/MrHodl/status/1041448002005741568",
			alertBodyHtml:"This address was generated from the SHA256 hash of 'Satoshi Nakamoto' as example of the 'brainwallet' concept."
		},
		{
			type: "tx",
			date: "2010-11-14",
			txid: "e3bf3d07d4b0375638d5f1db5255fe07ba2c4cb067cd81b84ee974b6585fb468",
			summary: "Duplicated coinbase transaction #1",
			referenceUrl: "https://bitcoin.stackexchange.com/questions/38994/will-there-be-21-million-bitcoins-eventually/38998#38998",
			alertBodyHtml: "This is one of 2 'duplicate coinbase' transactions. An early bitcoin bug (fixed by <a href='https://github.com/bitcoin/bips/blob/master/bip-0030.mediawiki'>BIP30</a>) allowed identical coinbase transactions - a newer duplicate would overwrite older copies. This transaction was the coinbase transaction for <a href='/block-height/91722'>Block #91,722</a> and, ~16 hours later, <a href='/block-height/91880'>Block #91,880</a>. The 50 BTC claimed as the coinbase for block 91,722 were also overwritten and lost."
		},
		{
			type: "tx",
			date: "2010-11-14",
			txid: "d5d27987d2a3dfc724e359870c6644b40e497bdc0589a033220fe15429d88599",
			summary: "Duplicated coinbase transaction #2",
			referenceUrl: "https://bitcoin.stackexchange.com/questions/38994/will-there-be-21-million-bitcoins-eventually/38998#38998",
			alertBodyHtml: "This is one of 2 'duplicate coinbase' transactions. An early bitcoin bug (fixed by <a href='https://github.com/bitcoin/bips/blob/master/bip-0030.mediawiki'>BIP30</a>) allowed identical coinbase transactions - a newer duplicate would overwrite older copies. This transaction was the coinbase transaction for <a href='/block-height/91812'>Block #91,812</a> and, ~3 hours later, <a href='/block-height/91842'>Block #91,842</a>. The 50 BTC claimed as the coinbase for block 91,812 were also overwritten and lost."
		}
	],
	exchangeRateData:{
		jsonUrl:"https://api.coindesk.com/v1/bpi/currentprice.json",
		responseBodySelectorFunction:function(responseBody) {
			//console.log("Exchange Rate Response: " + JSON.stringify(responseBody));

			var exchangedCurrencies = ["USD", "GBP", "EUR"];

			if (responseBody.bpi) {
				var exchangeRates = {};

				for (var i = 0; i < exchangedCurrencies.length; i++) {
					if (responseBody.bpi[exchangedCurrencies[i]]) {
						exchangeRates[exchangedCurrencies[i].toLowerCase()] = responseBody.bpi[exchangedCurrencies[i]].rate_float;
					}
				}

				return exchangeRates;
			}
			
			return null;
		}
	},
	blockRewardFunction:function(blockHeight) {
		var eras = [ new Decimal8(50) ];
		for (var i = 1; i < 34; i++) {
			var previous = eras[i - 1];
			eras.push(new Decimal8(previous).dividedBy(2));
		}

		var index = Math.floor(blockHeight / 210000);

		return eras[index];
	}
};