From 9fe20ee5ef5528364d0a497e4e50e7a6f69142c5 Mon Sep 17 00:00:00 2001
From: Adam Soltys <adam@coinos.io>
Date: Tue, 15 Jul 2025 12:51:33 -0700
Subject: basic wallet

---
 bun.lockb                       | Bin 60922 -> 66510 bytes
 package.json                    |   8 +-
 src/app.css                     |  22 ++++
 src/lib/Mnemonic.svelte         |  16 ---
 src/lib/index.ts                |   4 +-
 src/routes/+layout.svelte       |  21 +--
 src/routes/+page.svelte         | 281 ++++++++++++++++++++++++++++++++++++++--
 src/routes/create/+page.svelte  |  44 -------
 src/routes/created/+page.svelte |   0
 static/bg.png                   | Bin 0 -> 182111 bytes
 static/bg.webp                  | Bin 0 -> 27804 bytes
 static/bitcoin.svg              |   7 +
 static/type.svg                 |  19 ---
 13 files changed, 317 insertions(+), 105 deletions(-)
 delete mode 100644 src/lib/Mnemonic.svelte
 delete mode 100644 src/routes/create/+page.svelte
 delete mode 100644 src/routes/created/+page.svelte
 create mode 100644 static/bg.png
 create mode 100644 static/bg.webp
 create mode 100644 static/bitcoin.svg
 delete mode 100644 static/type.svg

diff --git a/bun.lockb b/bun.lockb
index 1e10611..c6687a9 100755
Binary files a/bun.lockb and b/bun.lockb differ
diff --git a/package.json b/package.json
index 0179457..b8b1aea 100644
--- a/package.json
+++ b/package.json
@@ -17,6 +17,8 @@
 		"@sveltejs/adapter-auto": "^6.0.0",
 		"@sveltejs/kit": "^2.22.0",
 		"@sveltejs/vite-plugin-svelte": "^6.0.0",
+		"@tailwindcss/forms": "^0.5.9",
+		"@tailwindcss/typography": "^0.5.15",
 		"@tailwindcss/vite": "^4.0.0",
 		"prettier": "^3.4.2",
 		"prettier-plugin-svelte": "^3.3.3",
@@ -28,6 +30,10 @@
 		"vite": "^7.0.4"
 	},
 	"dependencies": {
-		"@scure/bip39": "^1.6.0"
+		"@scure/base": "^1.2.6",
+		"@scure/bip32": "^1.7.0",
+		"@scure/bip39": "^1.6.0",
+		"@scure/btc-signer": "^1.8.1",
+		"daisyui": "^5.0.46"
 	}
 }
diff --git a/src/app.css b/src/app.css
index d4b5078..cafcee5 100644
--- a/src/app.css
+++ b/src/app.css
@@ -1 +1,23 @@
 @import 'tailwindcss';
+@plugin '@tailwindcss/forms';
+@plugin '@tailwindcss/typography';
+@plugin "daisyui";
+
+html { height: 100%; }
+html, body {
+  margin: 0;
+  padding: 0;
+  overflow-x: hidden;
+}
+
+body {
+  padding-top: 40px;
+}
+
+html {
+  background-image: url('/bg.webp');
+  background-size: cover;
+  background-position: center;
+  background-repeat: no-repeat;
+}
+
diff --git a/src/lib/Mnemonic.svelte b/src/lib/Mnemonic.svelte
deleted file mode 100644
index 117c98f..0000000
--- a/src/lib/Mnemonic.svelte
+++ /dev/null
@@ -1,16 +0,0 @@
-<script>
-  let { mnemonic } = $props();
-</script>
-
-<div class="card">
-  <div
-    class="card-body text-secondary grid grid-flow-col grid-rows-6 sm:grid-rows-none grid-cols-2 sm:grid-cols-3 sm:grid-flow-row gap-x-8 gap-y-2 justify-center whitespace-nowrap m-auto"
-  >
-    {#each mnemonic.split(" ") as w, i}
-      <div>
-        <span class="select-none text-neutral">{i + 1}.</span>
-        <span>{@html w === "-" ? "&mdash;" : w}</span>
-      </div>
-    {/each}
-  </div>
-</div>
diff --git a/src/lib/index.ts b/src/lib/index.ts
index 02f71ba..c05c77e 100644
--- a/src/lib/index.ts
+++ b/src/lib/index.ts
@@ -1,7 +1,9 @@
-import { writable } from 'svelte/store';
 import { browser } from "$app/environment";
+import { writable } from "svelte/store";
 
 export const focus = (el: HTMLElement) =>
 	browser && screen.width > 1280 && setTimeout(() => el.focus(), 1);
 
 export const mnemonic = writable();
+export const password = writable();
+export const address = writable();
diff --git a/src/routes/+layout.svelte b/src/routes/+layout.svelte
index 1729999..ceb238b 100644
--- a/src/routes/+layout.svelte
+++ b/src/routes/+layout.svelte
@@ -4,14 +4,15 @@
 	let { children } = $props();
 </script>
 
-<div class="container mx-auto mt-10 space-y-5 rounded-2xl bg-gray-100 p-8 text-xl shadow-lg">
-	<div class="flex">
-		<a href="/" class="mx-auto text-2xl">Bitcoin Wallet</a>
-	</div>
-
-	{@render children()}
-</div>
+	<div
+		class="container mx-auto max-w-3xl space-y-5 rounded-2xl bg-gray-100 p-8 text-xl shadow-lg"
+	>
+		<div class="flex items-center justify-center gap-2">
+			<img src="/bitcoin.svg" />
+			<div>
+				<a href="/" class="mx-auto text-2xl">Bitcoin Wallet</a>
+			</div>
+		</div>
 
-<div class="my-4 flex">
-	<a href="https://github.com/asoltys/paper" class="mx-auto">Source code</a>
-</div>
+		{@render children()}
+	</div>
diff --git a/src/routes/+page.svelte b/src/routes/+page.svelte
index 44bcb6a..db8986d 100644
--- a/src/routes/+page.svelte
+++ b/src/routes/+page.svelte
@@ -1,14 +1,267 @@
-<div class="flex flex-wrap justify-center gap-2">
-	<a
-		href="/create"
-		class="flex w-full justify-center gap-2 rounded-2xl border bg-white p-4 md:w-60"
-	>
-		<img src="/random.svg" class="w-8" />
-		<div class="my-auto">Generate</div>
-	</a>
-
-	<a href="/type" class="flex w-full justify-center gap-2 rounded-2xl border bg-white p-4 md:w-60">
-		<img src="/type.svg" class="w-8" />
-		<div class="my-auto">Import</div>
-	</a>
-</div>
+<script>
+	import { hex } from '@scure/base';
+	import { HDKey } from '@scure/bip32';
+	import * as btc from '@scure/btc-signer';
+	import { goto } from '$app/navigation';
+	import { onMount, tick } from 'svelte';
+	import { focus } from '$lib';
+	import { generateMnemonic, mnemonicToSeedSync } from '@scure/bip39';
+	import { wordlist } from '@scure/bip39/wordlists/english';
+
+	import { getAddress, p2wpkh } from '@scure/btc-signer/payment';
+
+	let NET = 'bitcoin';
+	const versions = {
+		bitcoin: {
+			private: 0x0488ade4,
+			public: 0x0488b21e
+		},
+		regtest: {
+			private: 0x04358394,
+			public: 0x043587cf
+		}
+	}[NET];
+
+	const network = {
+		bitcoin: {
+			bech32: 'bc',
+			pubKeyHash: 0x00,
+			scriptHash: 0x05,
+			wif: 0x80
+		},
+		regtest: {
+			bech32: 'bcrt',
+			pubKeyHash: 0x6f,
+			scriptHash: 0xc4,
+			wif: 0xef
+		}
+	}[NET];
+
+	let fees, rate;
+	let utxos = [];
+
+	let api = 'https://mempool.space/api';
+	let amt = $state(800);
+	// let destination = $state('bc1qqz6nlwxwmfqw0v864p5sggqst2xf0mevtyc579');
+	// let password = $state('123');
+	// let mnemonic = $state(
+	// 	'lizard armor follow dinner quarter talent truly among column rebuild arrest mix'
+	// );
+	// let withdrawing = $state(true);
+	let destination = $state();
+	let password = $state();
+	let mnemonic = $state();
+	let withdrawing = $state();
+
+	let balance = $state();
+	let pending = $state();
+
+	let loading = $state();
+
+	let generate = async () => {
+		mnemonic = await generateMnemonic(wordlist);
+	};
+
+	onMount(async () => {
+		// setTimeout(checkBalance, 1000);
+
+		if (NET === 'regtest') {
+			fees = { fastestFee: 281, halfHourFee: 271, hourFee: 256, economyFee: 44, minimumFee: 22 };
+		} else {
+			fees = await fetch(`${api}/v1/fees/recommended`).then((r) => r.json());
+		}
+
+		rate = fees['halfHourFee'];
+	});
+
+	let getHex = async (txid) => {
+		if (txid instanceof Uint8Array) txid = hex.encode(txid);
+		return hex.decode(await fetch(`${api}/tx/${txid}/hex`).then((r) => r.text()));
+	};
+
+	let node = $derived.by(() => {
+		if (!mnemonic) return;
+		const seed = mnemonicToSeedSync(mnemonic, password);
+		const root = HDKey.fromMasterSeed(seed, versions);
+		return root.derive(`m/84'/0'/0'/0/0`);
+	});
+
+	let address = $derived(node ? p2wpkh(node.publicKey).address : undefined);
+	let txid = $state();
+
+	let checkBalance = async (e) => {
+		e?.preventDefault();
+		loading = true;
+		utxos = await fetch(`${api}/address/${address}/utxo`).then((r) => r.json());
+
+		balance = 0;
+		pending = 0;
+
+		for (let { value, status } of utxos) {
+			if (status.confirmed) balance += value;
+			else pending += value;
+		}
+
+		loading = false;
+	};
+
+	let send = async () => {
+		let sats = 100000000;
+		let b = (n) => (Number(n) / sats).toFixed(8);
+		let inputs = [];
+		let outputs = [];
+		let fee, tx;
+
+		let i = 0;
+		let total = 0n;
+		let amount = BigInt(amt);
+
+		while (total < amount) {
+			total += BigInt(utxos[i].value);
+			i++;
+			if (i > utxos.length) throw new Error('insufficient funds');
+		}
+
+		let change = total - amount;
+
+		tx = new btc.Transaction();
+
+		for await (let { input, vout, txid } of utxos.slice(0, i)) {
+			tx.addInput({
+				txid,
+				index: vout,
+				nonWitnessUtxo: await getHex(txid),
+				sequence: 0xfffffffd
+			});
+		}
+
+		tx.addOutputAddress(destination, amount, network);
+		tx.addOutputAddress(address, change, network);
+
+		console.log(tx.unsignedTx.length);
+
+		while (i <= utxos.length) {
+			fee = BigInt(rate) * BigInt(tx.unsignedTx.length * 2);
+
+			if (fee <= change) {
+				let q = new btc.Transaction();
+				for (let i = 0; i < tx.inputsLength; i++) {
+					let input = tx.getInput(i);
+
+					let nonWitnessUtxo = await getHex(input.txid);
+					q.addInput({ ...input, nonWitnessUtxo });
+				}
+				q.addOutput(tx.getOutput(0));
+				q.addOutputAddress(address, change - fee, network);
+				tx = q;
+
+				break;
+			} else {
+				if (i === utxos.length) {
+					if (fee > amount) throw new Error('insufficient funds');
+					else {
+						let q = new btc.Transaction();
+						for (let i = 0; i < tx.inputsLength; i++) {
+							let input = tx.getInput(i);
+
+							let nonWitnessUtxo = await getHex(input.txid);
+							q.addInput({ ...input, nonWitnessUtxo });
+						}
+
+						q.addOutputAddress(destination, total - fee, network);
+
+						tx = q;
+						break;
+					}
+				}
+
+				let { txid, vout } = utxos[++i];
+				tx.addInput({
+					hash: txid,
+					index: vout,
+					nonWitnessUtxo: await getHex(txid)
+				});
+			}
+		}
+
+		let privkey = node.privateKey;
+		for (let i = 0; i < tx.inputsLength; i++) {
+			tx.signIdx(privkey, 0);
+			let input = tx.getInput(i);
+			let utxo = input.nonWitnessUtxo.outputs[input.index];
+
+			inputs = [
+				...inputs,
+				{
+					address: btc.Address(network).encode(btc.OutScript.decode(utxo.script)),
+					amount: b(utxo.amount)
+				}
+			];
+		}
+
+		outputs = tx.outputs.map((o) => ({
+			address: btc.Address(network).encode(btc.OutScript.decode(o.script)),
+			amount: b(o.amount)
+		}));
+
+		tx.finalize();
+
+		txid = await fetch(`${api}/tx`, {
+			method: 'POST',
+			body: tx.hex
+		}).then((r) => r.text());
+	};
+</script>
+
+<form class="space-y-5" onsubmit={checkBalance}>
+	<div class="flex items-center gap-2">
+		<textarea use:focus class="textarea grow" placeholder="Seed phrase" bind:value={mnemonic}
+		></textarea>
+		<button type="button" class="btn flex gap-1" onclick={generate}>
+			<img src="/random.svg" class="w-8" />
+			<div>Generate</div>
+		</button>
+	</div>
+
+	<input class="input w-full" placeholder="Passphrase" bind:value={password} />
+
+	{#if address}
+		<div class="flex items-center gap-2">
+			<div>
+				Address: {address}
+			</div>
+
+			<button type="submit" class="btn ml-auto"> Check balance </button>
+		</div>
+	{/if}
+</form>
+
+{#if loading}
+	<div>
+		<div class="loading loading-spinner"></div>
+	</div>
+{:else if typeof balance !== 'undefined'}
+	<div class="flex items-center gap-2">
+		<div>
+			Balance: {balance} sats
+			{#if pending}
+				<span class="text-orange-600">({pending} pending)</span>
+			{/if}
+		</div>
+		{#if balance + pending > 0}
+			<button type="submit" class="btn ml-auto" onclick={() => (withdrawing = true)}>
+				Withdraw</button
+			>
+		{/if}
+	</div>
+{/if}
+
+{#if txid}
+	<a href={`https://mempool.space/tx/${txid}`}>{txid}</a>
+{:else if withdrawing}
+	<input class="input w-full" placeholder="Destination address" bind:value={destination} />
+
+	<input class="input w-full" placeholder="Amount" bind:value={amt} />
+
+	<button type="submit" class="btn ml-auto" onclick={send}> Send</button>
+{/if}
diff --git a/src/routes/create/+page.svelte b/src/routes/create/+page.svelte
deleted file mode 100644
index 1d09990..0000000
--- a/src/routes/create/+page.svelte
+++ /dev/null
@@ -1,44 +0,0 @@
-<script>
-	import { goto } from '$app/navigation';
-	import { onMount, tick } from 'svelte';
-	import { mnemonic, focus } from '$lib';
-	import { generateMnemonic } from '@scure/bip39';
-	import { wordlist } from '@scure/bip39/wordlists/english';
-	import Mnemonic from '$lib/Mnemonic.svelte';
-
-	let password;
-
-	let submitted;
-	let bm;
-	onMount(async () => {
-		$mnemonic = await generateMnemonic(wordlist);
-	});
-
-	let submit = async () => {
-		submitted = true;
-		await tick();
-
-		goto('/created');
-	};
-</script>
-
-<Mnemonic mnemonic={$mnemonic} />
-
-<form class="space-y-5 text-center" on:submit|preventDefault={submit}>
-	<div>
-		<input
-			use:focus
-			name="password"
-			class="rounded-2xl bg-white p-4 text-2xl"
-			placeholder="Passphrase"
-			bind:value={password}
-		/>
-	</div>
-
-	<button
-		type="submit"
-		class="mx-auto flex w-full justify-center gap-2 rounded-2xl border bg-white p-4 md:w-60"
-	>
-		<div class="my-auto">Submit</div>
-	</button>
-</form>
diff --git a/src/routes/created/+page.svelte b/src/routes/created/+page.svelte
deleted file mode 100644
index e69de29..0000000
diff --git a/static/bg.png b/static/bg.png
new file mode 100644
index 0000000..f542416
Binary files /dev/null and b/static/bg.png differ
diff --git a/static/bg.webp b/static/bg.webp
new file mode 100644
index 0000000..290cb41
Binary files /dev/null and b/static/bg.webp differ
diff --git a/static/bitcoin.svg b/static/bitcoin.svg
new file mode 100644
index 0000000..04079be
--- /dev/null
+++ b/static/bitcoin.svg
@@ -0,0 +1,7 @@
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+<svg xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg" height="64" width="64" version="1.1" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
+<g transform="translate(0.00630876,-0.00301984)">
+<path fill="#f7931a" d="m63.033,39.744c-4.274,17.143-21.637,27.576-38.782,23.301-17.138-4.274-27.571-21.638-23.295-38.78,4.272-17.145,21.635-27.579,38.775-23.305,17.144,4.274,27.576,21.64,23.302,38.784z"/>
+<path fill="#FFF" d="m46.103,27.444c0.637-4.258-2.605-6.547-7.038-8.074l1.438-5.768-3.511-0.875-1.4,5.616c-0.923-0.23-1.871-0.447-2.813-0.662l1.41-5.653-3.509-0.875-1.439,5.766c-0.764-0.174-1.514-0.346-2.242-0.527l0.004-0.018-4.842-1.209-0.934,3.75s2.605,0.597,2.55,0.634c1.422,0.355,1.679,1.296,1.636,2.042l-1.638,6.571c0.098,0.025,0.225,0.061,0.365,0.117-0.117-0.029-0.242-0.061-0.371-0.092l-2.296,9.205c-0.174,0.432-0.615,1.08-1.609,0.834,0.035,0.051-2.552-0.637-2.552-0.637l-1.743,4.019,4.569,1.139c0.85,0.213,1.683,0.436,2.503,0.646l-1.453,5.834,3.507,0.875,1.439-5.772c0.958,0.26,1.888,0.5,2.798,0.726l-1.434,5.745,3.511,0.875,1.453-5.823c5.987,1.133,10.489,0.676,12.384-4.739,1.527-4.36-0.076-6.875-3.226-8.515,2.294-0.529,4.022-2.038,4.483-5.155zm-8.022,11.249c-1.085,4.36-8.426,2.003-10.806,1.412l1.928-7.729c2.38,0.594,10.012,1.77,8.878,6.317zm1.086-11.312c-0.99,3.966-7.1,1.951-9.082,1.457l1.748-7.01c1.982,0.494,8.365,1.416,7.334,5.553z"/>
+</g>
+</svg>
diff --git a/static/type.svg b/static/type.svg
deleted file mode 100644
index 6568c5b..0000000
--- a/static/type.svg
+++ /dev/null
@@ -1,19 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?><!-- Uploaded to: SVG Repo, www.svgrepo.com, Generator: SVG Repo Mixer Tools -->
-<svg version="1.1" id="Uploaded to svgrepo.com" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" 
-	 width="800px" height="800px" viewBox="0 0 32 32" xml:space="preserve">
-<style type="text/css">
-	.puchipuchi_een{fill:#111918;}
-</style>
-<path class="puchipuchi_een" d="M30,7H2C0.9,7,0,7.9,0,9v15c0,1.1,0.9,2,2,2h28c1.1,0,2-0.9,2-2V9C32,7.9,31.1,7,30,7z M18.5,10
-	c0.828,0,1.5,0.672,1.5,1.5S19.328,13,18.5,13S17,12.328,17,11.5S17.672,10,18.5,10z M18.5,15c0.828,0,1.5,0.672,1.5,1.5
-	S19.328,18,18.5,18S17,17.328,17,16.5S17.672,15,18.5,15z M13.5,10c0.828,0,1.5,0.672,1.5,1.5S14.328,13,13.5,13S12,12.328,12,11.5
-	S12.672,10,13.5,10z M13.5,15c0.828,0,1.5,0.672,1.5,1.5S14.328,18,13.5,18S12,17.328,12,16.5S12.672,15,13.5,15z M8.5,10
-	c0.828,0,1.5,0.672,1.5,1.5S9.328,13,8.5,13S7,12.328,7,11.5S7.672,10,8.5,10z M8.5,15c0.828,0,1.5,0.672,1.5,1.5S9.328,18,8.5,18
-	S7,17.328,7,16.5S7.672,15,8.5,15z M3.5,23C2.672,23,2,22.328,2,21.5S2.672,20,3.5,20S5,20.672,5,21.5S4.328,23,3.5,23z M3.5,18
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