bitcoin manual withdraw when exchange has btc currency
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Sebastian
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@ -40,6 +40,7 @@
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"typescript": "^4.5.5"
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},
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"dependencies": {
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"bech32-buffer": "^0.2.0",
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"big-integer": "^1.6.51",
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"jed": "^1.1.1",
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"tslib": "^2.3.1"
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63
packages/taler-util/src/bitcoin.ts
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63
packages/taler-util/src/bitcoin.ts
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@ -0,0 +1,63 @@
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/*
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This file is part of GNU Taler
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(C) 2019 Taler Systems S.A.
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GNU Taler is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
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*/
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import { AmountJson } from "."
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import { Amounts, } from "./amounts"
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import { getRandomBytes, decodeCrock, encodeCrock } from "./talerCrypto"
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import { encode as segwitEncode } from "bech32-buffer"
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/**
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*
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* @author sebasjm
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*/
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export interface SegwitAddrs {
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segwitAddr1: string,
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segwitAddr2: string,
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}
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function buf2hex(buffer: Uint8Array) { // buffer is an ArrayBuffer
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return [...new Uint8Array(buffer)]
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.map(x => x.toString(16).padStart(2, '0'))
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.join('');
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}
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export function generateSegwitAddress(reservePub: string): SegwitAddrs {
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const pub = decodeCrock(reservePub)
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const first_rnd = getRandomBytes(4)
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const second_rnd = new Uint8Array(first_rnd.length)
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second_rnd.set(first_rnd)
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first_rnd[0] = first_rnd[0] & 0b0111_1111
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second_rnd[0] = second_rnd[0] | 0b1000_0000
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const first_part = new Uint8Array(first_rnd.length + pub.length / 2)
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first_part.set(first_rnd, 0)
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first_part.set(pub.subarray(0, 16), 4)
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const second_part = new Uint8Array(first_rnd.length + pub.length / 2)
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second_part.set(first_rnd, 0)
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second_part.set(pub.subarray(16, 32), 4)
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return {
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segwitAddr1: segwitEncode("bc", first_part),
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segwitAddr2: segwitEncode("bc", second_part),
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}
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}
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// https://github.com/bitcoin/bitcoin/blob/master/src/policy/policy.cpp
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export function segwitMinAmount(): AmountJson {
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return Amounts.parseOrThrow("BTC:0.00000294")
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}
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@ -23,6 +23,7 @@ export { fnutil } from "./fnutils.js";
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export * from "./kdf.js";
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export * from "./talerCrypto.js";
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export * from "./http-status-codes.js";
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export * from "./bitcoin.js";
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export {
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randomBytes,
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secretbox,
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@ -51,3 +51,15 @@ export const IBAN = createExample(TestedComponent, {
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},
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exchangeBaseUrl: "https://exchange.demo.taler.net",
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});
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export const Bitcoin = createExample(TestedComponent, {
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reservePub: "0ZSX8SH0M30KHX8K3Y1DAMVGDQV82XEF9DG1HC4QMQ3QWYT4AF00",
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payto:
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"payto://bitcoin/bc1qw508d6qejxtdg4y5r3zarvary0c5xw7kv8f3t4?amount=BTC:0.1&subject=0ZSX8SH0M30KHX8K3Y1DAMVGDQV82XEF9DG1HC4QMQ3QWYT4AF00",
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amount: {
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currency: "BTC",
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value: 0,
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fraction: 14000000,
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},
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exchangeBaseUrl: "https://exchange.demo.taler.net",
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});
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@ -1,4 +1,11 @@
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import { AmountJson, parsePaytoUri, i18n } from "@gnu-taler/taler-util";
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import {
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AmountJson,
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parsePaytoUri,
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i18n,
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generateSegwitAddress,
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Amounts,
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segwitMinAmount,
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} from "@gnu-taler/taler-util";
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import { Fragment, h, VNode } from "preact";
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import { BankDetailsByPaytoType } from "../components/BankDetailsByPaytoType";
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import { QR } from "../components/QR";
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@ -30,18 +37,62 @@ export function ReserveCreated({
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</div>
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);
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}
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function TransferDetails(): VNode {
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if (!paytoURI) return <Fragment />;
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if (paytoURI.targetType === "bitcoin") {
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const { segwitAddr1, segwitAddr2 } = generateSegwitAddress(reservePub);
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const min = segwitMinAmount();
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return (
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<Fragment>
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<section>
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<h1>
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<i18n.Translate>Exchange is ready for withdrawal</i18n.Translate>
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</h1>
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<p>
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<i18n.Translate>
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To complete the process you need to wire
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<b>{amountToString(amount)}</b> to the exchange bank account
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Bitcoin exchange need a transaction with 3 output, one output is
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the exchange account and the other two are segwit fake address for
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metadata with an minimum amount. Reserve pub : {reservePub}
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</i18n.Translate>
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</p>
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<p>
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<i18n.Translate>
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In bitcoincore wallet use 'Add Recipient' button to add two
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additional recipient and copy adresses and amounts
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</i18n.Translate>
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<ul>
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<li>
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{paytoURI.targetPath} {Amounts.stringifyValue(amount)} BTC
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</li>
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<li>
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{segwitAddr1} {Amounts.stringifyValue(min)} BTC
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</li>
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<li>
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{segwitAddr2} {Amounts.stringifyValue(min)} BTC
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</li>
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</ul>
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<i18n.Translate>
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In Electrum wallet paste the following three lines in 'Pay to'
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field :
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</i18n.Translate>
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<ul>
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<li>
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{paytoURI.targetPath},{Amounts.stringifyValue(amount)}
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</li>
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<li>
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{segwitAddr1},{Amounts.stringifyValue(min)}
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</li>
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<li>
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{segwitAddr2},{Amounts.stringifyValue(min)}
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</li>
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</ul>
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<i18n.Translate>
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Make sure the amount show{" "}
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{Amounts.stringifyValue(Amounts.sum([amount, min, min]).amount)}{" "}
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BTC, else you have to change the base unit to BTC
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</i18n.Translate>
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</p>
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</section>
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);
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}
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return (
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<section>
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<BankDetailsByPaytoType
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amount={amountToString(amount)}
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exchangeBaseUrl={exchangeBaseUrl}
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@ -57,10 +108,27 @@ export function ReserveCreated({
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</WarningBox>
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</p>
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</section>
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);
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}
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return (
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<Fragment>
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<section>
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<h1>
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<i18n.Translate>Exchange is ready for withdrawal</i18n.Translate>
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</h1>
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<p>
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<i18n.Translate>
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To complete the process you need to wire{` `}
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<b>{amountToString(amount)}</b> to the exchange bank account
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</i18n.Translate>
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</p>
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</section>
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<TransferDetails />
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<section>
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<p>
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<i18n.Translate>
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Alternative, you can also scan this QR code or open
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Alternative, you can also scan this QR code or open{" "}
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<a href={payto}>this link</a> if you have a banking app installed
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that supports RFC 8905
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</i18n.Translate>
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@ -164,6 +164,7 @@ importers:
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specifiers:
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'@types/node': ^17.0.17
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ava: ^4.0.1
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bech32-buffer: ^0.2.0
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big-integer: ^1.6.51
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esbuild: ^0.14.21
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jed: ^1.1.1
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@ -172,6 +173,7 @@ importers:
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tslib: ^2.3.1
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typescript: ^4.5.5
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dependencies:
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bech32-buffer: 0.2.0
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big-integer: 1.6.51
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jed: 1.1.1
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tslib: 2.3.1
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@ -8248,6 +8250,11 @@ packages:
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tweetnacl: 0.14.5
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dev: true
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/bech32-buffer/0.2.0:
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resolution: {integrity: sha512-Ez8s82a+Xnn/m3/ftGaQJUSFG4EwNIj9adIJBw8OrHASQsXgvwLSducbcJ9El0rsrwJYJ71yBhC/hZzz3FPSCQ==}
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engines: {node: '>=8'}
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dev: false
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/better-opn/2.1.1:
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resolution: {integrity: sha512-kIPXZS5qwyKiX/HcRvDYfmBQUa8XP17I0mYZZ0y4UhpYOSvtsLHDYqmomS+Mj20aDvD3knEiQ0ecQy2nhio3yA==}
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engines: {node: '>8.0.0'}
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