seedgen

A seed phrase generator: one tap (or a swipe) makes a 12- or 24-word phrase and its addresses for the largest coins: Solana, Ethereum, Bitcoin, BNB Smart Chain, XRP, Tron, Zcash, Dogecoin, TON and Monero — the CoinGecko top 10 of 24 Oct 2026, with USDT/USDC (no chain of their own, a note on the card), Hyperliquid (an EVM address, named in the Ethereum row) and the tokenised-loan "Figure Heloc" set aside, plus TON. "Copy all addresses" puts every row on the clipboard, one Name: address per line, Trust Wallet's own ones last. Each address row has an Exchange button: it opens changenow.io with that coin as "You get" (/exchange?from=btc&to=…, from ETH for Bitcoin) and copies the address to paste as the recipient. ChangeNOW's page takes no recipient in the URL (an unknown parameter resets the form), so nothing from the card goes with the link. Favourites are kept in localStorage, deleted with two taps. Each address has a QR button (drawn in the page by qrcode-generator, no request). Swipes on the card: left for a new wallet, right for the last one — the card follows the finger, then flies off while the next rises; up from the phrase or the card's head stars it, and a star flies to the Favourites tab. Up from the addresses stays a scroll (touch-action: pan-x pan-up on the phrase and the head; the browser keeps the way down). A short, fast flick commits like a long drag. Ships as a PWA and as a Telegram Mini App. Spec: ~/mind/mobile/sites/seedgen.md.

Lives at https://seedgen.uk/ (Vercel project seedgen; DNS at GoDaddy, www 308s to the apex). It started at sol2go.lol/seedgen/, which now 301s here from sol2go's vercel.json.

Every push to main deploys to production (the Vercel project is linked to this repo); other branches get preview deployments.

The page is dated by the last commit that changed src/; npm run build writes that date to src/updated.txt, which Vercel's build falls back on (it has no git history to read) for the sitemap's lastmod. Build locally and commit it with the change.

The phrase

12 or 24 words, the reader's choice (remembered in localStorage).

24 BIP39 words are drawn until the phrase is also a valid TON mnemonic (one in ~256 is), so the same words import everywhere:

Chain	Derivation	Wallets
Solana	m/44'/501'/0'/0' (SLIP-10 ed25519)	Phantom, Solflare, Backpack
Ethereum	m/44'/60'/0'/0/0	MetaMask, Rabby
Bitcoin	m/84'/0'/0'/0/0, native SegWit	any BIP84 wallet
BNB Smart Chain	m/44'/60'/0'/0/0, the Ethereum address	Trust Wallet, MetaMask
XRP	m/44'/144'/0'/0/0, base58 in Ripple's alphabet	Xaman, Trust Wallet
Tron	m/44'/195'/0'/0/0	TronLink, Trust Wallet
Zcash	m/44'/133'/0'/0/0, transparent t1… (shielded needs a Zcash wallet's own keys)	Trust Wallet
Dogecoin	m/44'/3'/0'/0/0, P2PKH D…	Trust Wallet, Exodus
Monero	m/44'/128'/0'/0/0 (secp256k1 key reduced mod l = spend key; view key = keccak256(spend) reduced)	BIP39 import only; not a native 25-word seed. Trust Wallet has no Monero
TON, 24 words	TON mnemonic → wallet W5 (v5r1), non-bounceable UQ…	Tonkeeper, MyTonWallet
TON, 12 words	m/44'/607'/0' (SLIP-10 ed25519) → wallet v4R2	Trust Wallet

A TON mnemonic is always 24 words, so a 12-word phrase is BIP39 only, and its TON address is the one Trust Wallet derives (wallet-core tw_ton: that path, v4R2). Tonkeeper will not import it. The other way round, Trust Wallet reads a 24-word phrase as BIP39 for TON too and shows a different TON address from Tonkeeper's; the card names the wallet on the TON row.

Trust Wallet

Trust Wallet takes any phrase from here and reads it as BIP39, with its own defaults (wallet-core registry.json): Ethereum, Bitcoin (BIP84) and Tron (and BNB, XRP, Zcash, Dogecoin) match the card; Solana is m/44'/501'/0' (Phantom's has one more /0') and TON is m/44'/607'/0' v4R2 for any length. The card shows those two under "In Trust Wallet" wherever they differ from the rows above, and the tests hold both to wallet-core's mnemonic vectors. Favourites saved before this get their Trust Wallet addresses derived when opened.

SEO

One page, so the work is on it: the head keyword in the title, h1 and description; a static FAQ answering the queries the page can win (import into Trust Wallet, Phantom vs Trust Wallet Solana address, 12 or 24 words, offline); JSON-LD with WebApplication and FAQPage; sitemap with every protocol field, lastmod from src/updated.txt.

The TON address is computed in src/wallet.ts by hashing the wallet's StateInit directly (W5 and v4R2), rather than through @ton/ton, which would add 270 KB for one hash. @ton/ton and @ton/crypto stay as dev dependencies so the tests can hold the result to them.

Security

• Randomness: crypto.getRandomValues via @scure/bip39; keys via the audited @noble/@scure libraries and Web Crypto PBKDF2.
• No network: the page makes no request beyond its own files (the e2e test asserts it), and the CSP (connect-src 'self') forbids one.
• Telegram's telegram-web-app.js is loaded only when the page is opened as a Mini App (tgWebAppData in the URL), never on the open web.
• Favourites are stored unencrypted on the device. The page says so.
• A notice on the page follows navigator.onLine: online it suggests airplane mode before generating, since the app keeps working; offline it says nothing can leave the device. The service worker makes the page open offline too once it has been loaded.
• The source is public (this repo), linked from the notice and the "How the seed phrase is made" section. Inside Telegram the link opens through WebApp.openLink.

Commands

npm run build   # dist/
npm test        # known-answer vectors for every chain; TON against @ton/ton and wallet-core
npm run serve   # dist/ on :4173
npm run e2e     # Chromium at 320px, light and dark: generate, 12/24, swipe, favourites, offline notice

License

MIT.