PlainPlainanswers.answers.

Cypra is a set of browser tools for sealing files and notes with AES-256-GCM, sharing them by link, managing the keys, and recording on Robinhood Chain who you allowed to read them. Encryption and decryption happen in your browser; the site never receives your plaintext, your passphrase or your key.

You choose a file or type a note. Your browser derives a key from your passphrase (PBKDF2-SHA-256, 600,000 rounds) or makes a random 256-bit key, then seals the content in 1 MiB chunks. You keep or send the sealed .cypra file. Optionally you anchor its hash on Robinhood Chain and grant or revoke addresses, which leaves a public, timestamped record of your decisions.

No. Sealing, sharing and key work need no wallet at all. You only sign with one when you write an access record on chain, and that costs a little ETH as gas.

It stays with you unless you send it. Sealing happens in the tab. If you use a share link and this site has storage switched on, only the sealed bytes are uploaded; the key sits after the # in the link, a part browsers never send to a server.

No. A grant on chain is a public statement of who you allowed, with a time and your address behind it. It does not enforce decryption: anyone who holds the sealed file and its key can open it. Only hashes and addresses go on chain, never the file or the key.

No. Cypra keeps no copy. Lose the passphrase or key and the sealed data stays sealed for good. Export your keys wrapped with a passphrase and keep that backup somewhere you control.

Robinhood Chain, chain 4663: a layer 2 on top of Ethereum that uses the Arbitrum stack. Gas costs ETH. Cypra is an independent project: Robinhood has not endorsed, sponsored or partnered with it.

$CYPRA has not launched yet. When it does, the contract address will appear on this site and the token page; until then, anything offered as $CYPRA elsewhere is not ours.

The plan is service credits, API access and premium features. None of it is active: every tool here is free and nothing reads your balance. $CYPRA gives no ownership, no share of revenue and no promised return.

A weak passphrase can be guessed, a compromised device can read what you type, and a lost key cannot be replaced. On-chain records are public forever. The contract has not been independently reviewed yet. Use the tools for data you can afford to handle with these limits in mind.