Kryptonite Profile
A single-page, static backtest for BTC, ETH, XRP, SOL, PAXG, XAUT, PANW (Palo Alto Networks stock) and the S&P 500 (via the SPY ETF). You log the
purchases you actually made - coin, what you spent, and the date - and the app looks
up that day's closing price, then tracks what each entry is worth now and over time.
Screenshots
Captured in a private browsing window with a throwaway vault and made-up purchases — eight small CAD entries spread over 2024–2025. The vault was deleted afterwards; nothing in these images is a real holding. The prices are the live market data the page fetches.
The dashboard: totals in every currency, price history, the portfolio value curve, dollar-vs-gold and DXY references, allocation and the per-entry breakdown.
The Entries tab, and the dashboard on a phone:
Entries on a phone, and a first visit — no vault exists yet, so the page asks for a passkey before anything can be entered:
What it does
- Buy entries. Each entry = coin + amount + purchase date, typed in the currency
selected in the corner (AED / CAD / USDT). The app fetches the daily close for that
exact date and values the holding as
amount x price(now) / price(buy date).
- Totals in every currency. What you own, what you put in, and profit/loss are
shown in AED, CAD and USDT side by side. "Put in" converts your spend at the buy
date's FX rate - the money you actually parted with, not a moving target.
- Charts. Price history for the four coins (% change or log price) and the
portfolio value curve, which steps up as entries come in.
- Encrypted vault. Everything you save is AES-256-GCM encrypted in your browser's
localStorage with a key derived from your passkey (PBKDF2-HMAC-SHA256, 600k
iterations, random salt). The passkey is never stored or transmitted; a wrong
passkey simply fails to decrypt. There is no recovery if you forget it. Passkey
(top-right) changes it: the vault is re-encrypted under the new passkey with a fresh
salt, and older backups keep opening with the passkey they were made with.
- Stay unlocked (opt-in). Tick it on the lock screen and the browser keeps the derived
AES key - never the passkey - as a non-extractable key in IndexedDB, so the page opens
without asking. Useful on a phone, where the browser reloads the tab constantly. Anyone
with that browser profile can then open the data; Lock forgets the key.
Privacy model
The page is static - there is no backend and no account. Your entries never leave
your browser, and the repository contains no secrets of any kind: authentication is
the ability to decrypt your own local data. Crypto prices come from Binance (CryptoCompare fallback); PANW from CNBC's chart API
(split-adjusted daily closes, open CORS, no key; stockanalysis.com is the fallback); FX history from Frankfurter
(ECB reference rates). AED uses the fixed 3.6725 peg and USDT is counted 1:1 with USD.
The market strip under the header shows live BTC / ETH / SOL / XRP / BNB from Binance's
24-hour ticker (CoinGecko fallback) and the US market via the SPY, DIA, QQQ and IWM ETFs from
CNBC quotes (stockanalysis.com fallback). Public prices only - it loads regardless of the vault and refreshes
every minute. It is hidden by default: click the word MARKETS to show or hide the prices, and
the choice is remembered in that browser.
Running it
Open index.html, or serve the folder statically:
python -m http.server 8899
Hosted at: https://offport.github.io/kryptonite-profile/
Cross-device: your encrypted vault lives only in the browser it was made in (per-origin
localStorage, never on GitHub). To use it on another device, press Backup to download the
encrypted file, move it over, and choose Restore from a backup file on the lock screen — the
same passkey then unlocks the same data. The backup is ciphertext; it is useless without the passkey.
LUCKY13 tab
The LUCKY13 tab hosts the lucky13 signal app (its own project, I:\GitHub\lucky13, port 8013) in a frame: on the box it points at 127.0.0.1:8013, over Tailscale at the /lucky13/ path of this origin. The frame loads when the tab is first opened; OPEN FULL opens the app in its own tab.
