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Status](https://travis-ci.org/bitcoinjs/electrum-mnemonic.png?branch=master)](https://travis-ci.org/bitcoinjs/electrum-mnemonic)\n[![NPM](https://img.shields.io/npm/v/electrum-mnemonic.svg)](https://www.npmjs.org/package/electrum-mnemonic)\n\n[![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg?style=flat-square)](https://github.com/prettier/prettier)\n\n## Install\n\n```bash\nnpm install electrum-mnemonic\n```\n\n## Usage\n\n* Generate a mnemonic (English only for now)\n\n```js\nconst mn = require('electrum-mnemonic')\nconsole.log(mn.generateMnemonic()) // default segwit bech32 wallet\nconsole.log(mn.generateMnemonic({ prefix: mn.PREFIXES.segwit })) // explicit segwit bech32 wallet\nconsole.log(mn.generateMnemonic({ prefix: mn.PREFIXES.standard })) // legacy p2pkh wallet (base58 address starting with 1)\nconsole.log(mn.generateMnemonic({ prefix: mn.PREFIXES['2fa'] })) // 2fa legacy\nconsole.log(mn.generateMnemonic({ prefix: mn.PREFIXES['2fa-segwit'] })) // legacy p2pkh wallet (base58 address starting with 1)\n```\n\n* Validate mnemonic phrase (default prefix: segwit)\n\n```js\nconst mn = require('electrum-mnemonic')\nconst segwitPhrase = mn.generateMnemonic();\nconst standardPhrase = mn.generateMnemonic({ prefix: mn.PREFIXES.standard });\nconsole.log(mn.validateMnemonic(segwitPhrase, mn.PREFIXES.segwit)); // true\nconsole.log(mn.validateMnemonic(standardPhrase, mn.PREFIXES.standard)); // true\n```\n\n* Convert mnemonic into 64 byte seed (for bip32)\n\n```js\nconst mn = require('electrum-mnemonic')\nconst phrase = mn.generateMnemonic()\nconst seed = mn.mnemonicToSeedSync(phrase, { passphrase: 'extrapassword' })\nconsole.log(seed)\n\n// async\n;(async () =\u003e {\n  const seed2 = await mn.mnemonicToSeed(phrase)\n  // no extra password so seed and seed2 should be different\n  console.log(seed2)\n})()\n```\n\n* mnemonicToSeed prefix must match the prefix used to generate (default: segwit)\n\n```js\nconst mn = require('electrum-mnemonic')\nconst phrase = mn.generateMnemonic({ prefix: mn.PREFIXES.standard })\nconst seed = mn.mnemonicToSeedSync(phrase, { prefix: mn.PREFIXES.standard })\nconsole.log(seed)\nconst segwitPhrase = mn.generateMnemonic()\nconst segwitSeed = mn.mnemonicToSeedSync(phrase)\nconsole.log(segwitSeed)\n```\n\n* Skip valid version prefix check\n\n```js\nconst mn = require('electrum-mnemonic')\nconst seed = mn.mnemonicToSeedSync('abc', { skipCheck: true })\nconsole.log(seed)\n```\n\n* Custom prefixes for checking\n\n```js\nconst mn = require('electrum-mnemonic')\nconst phrase = mn.generateMnemonic({ prefix: 'fed' })\nconst seed = mn.mnemonicToSeedSync(phrase, { prefix: 'fed' 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