Privacy
Your data, in plain words
Crypto Voyage is a small learning project by Olga Chernova, a student at 42 Prague. We keep as little as we can. Here is all of it.
What we keep about you
Only the name or nickname you type in. It is saved on your device and, when our database is switched on, on our server too, together with a random ID, your language and the dates you joined and last visited. No email, no password, no phone number.
What stays on your device only
Your progress, XP and streak, your practice wallet and the Phantom address you connected. They live in this browser's storage and never reach our server.
The AI guide
When you ask the guide something, your question and the lesson step you are on are sent to Google Gemini so it can write an answer. Your name is not sent. Please don't type personal details into the chat.
Visit statistics
We count page visits with Vercel Web Analytics. It uses no cookies and doesn't identify you. It only shows us things like how many people finish a lesson.
The blockchain is public
Everything on Solana devnet is public by design: anyone can see wallet addresses and transactions on Solana Explorer. Devnet coins have no value.
Who helps us run it
The site runs on Vercel, and the list of names is stored with Upstash. They process data only on our behalf. We never sell data and never show ads.
Why we keep it
So you don't have to type your name again, and so we can see how many people the course helps. That is our legitimate interest in running and improving it.
Your rights
You can see, correct or delete your data at any time: change your name in the app, or use the button below to delete everything. Under the GDPR you can also complain to a data protection authority (in Czechia, that's ÚOOÚ).
Questions?
Open an issue on our GitHub page and we'll answer.
Write to us on GitHubDelete my data
Removes your name from our server and clears everything this site saved in this browser: name, progress, XP and the practice wallet. This can't be undone.
Last updated: October 2026