Straight answers.

No. Carnet only knows your public addresses and extended public keys (xpubs). They let it read a wallet’s history, not spend from it. Carnet signs no transactions and never connects to your Ledger.

Never. Carnet doesn’t ask for your recovery phrase and won’t accept it. Nobody needs it to follow a wallet: any app or person asking for it is trying to rob you.

Only on your device, in a file encrypted with your password (Argon2id + XChaCha20-Poly1305), in the app’s data folder. There is no server and no account: Carnet’s publisher receives nothing. You can export a backup, which is encrypted too.

Carnet is designed for Ledger (it understands the JSON block from the Advanced section of Ledger Wallet), but all it does is read public addresses, so addresses from another wallet work just the same. The Ledger never needs to be plugged in.

Bitcoin, Ethereum and the main ERC-20 tokens, Solana and the main SPL tokens (lists built into the app), Cardano (its native tokens as quantities only, with no euro price), XRP (and the tokens issued on it, such as RLUSD), Litecoin, Dogecoin, Bitcoin Cash, Zcash (transparent part), Arbitrum One, Avalanche C-Chain, BNB Smart Chain, Cronos and HyperEVM, with their tokens from the built-in lists. That covers 39 of the top 50 cryptos by market cap, plus 2 more in part (CoinGecko ranking as of 20 Oct 2026). Crypto held on Coinbase is tracked too, by importing your statements. The coin-by-coin detail is on the Cryptos page.

Because the blockchain doesn’t know what you paid. If you bought on Coinbase and then sent the coins to your Ledger, Carnet matches each withdrawal with its arrival, so your crypto keeps its real cost basis. Coinbase Pro statements are only available until the end of 2026: download them before then.

The files themselves aren’t kept. Only the transactions are extracted, without your name, IBAN or card numbers.

Only Coinbase and Coinbase Pro can be imported for now. Crypto received from another exchange still shows up in your wallet, valued at the price on the day it arrived and flagged as an estimate; you can enter the amount you actually paid.

To sync a wallet, Carnet has to ask a public service about its addresses. Without Tor, that service also sees your IP address, and can link your wallets together if they are all queried from the same connection. On a computer, Carnet can go through Tor: each wallet then gets its own circuit, and Carnet refuses any direct connection while the option is on. It doesn’t bundle Tor: just leave Tor Browser open (or the tor service running) and turn the option on in the settings.

No. Carnet calculates your cost basis two ways, weighted average cost (WAC) and FIFO (first in, first out), along with your gains, as a guide only. It doesn’t apply the official formula of article 150 VH bis of the French tax code and doesn’t fill in any forms. One option treats swaps between cryptos as realising no gain, as French rules provide. For your tax return, talk to a professional or use a specialist tool.

By default, Carnet counts the way Ledger Wallet does: Ledger accounts only, with rewards valued at today’s price. Differences can still creep in. Carnet can also include Coinbase staking (the source filter) and value each reward at the price on the day it was received. And it doesn’t count as a reward the yield already built into the price of a liquid staking token (JitoSOL, wstETH…).

From the rewards actually received over 30 days, 90 days and 12 months, divided by the average amount actually staked over the period. A period with incomplete data is flagged as such. The estimate for the next 12 months and the projections (1 to 10 years, with or without reinvesting) then apply that yield, assumed constant, to what you have staked today. They are estimates, not promises.

It can’t be recovered, and that is precisely what keeps anyone else out of your vault. Your funds aren’t affected (they stay on the blockchain) and your wallets will sync again into a new vault, but you would have to redo your imports and manual corrections.

Carnet is coming to Mac, Windows, iPhone and Android. The same rules everywhere: no account, no server run by the publisher, and your data stays encrypted on your device. The Availability page shows where each version stands.

English and French. Carnet follows your system language (French if it is set to French, English otherwise), even on the unlock screen, and you can choose another one under Settings → Language; the change applies straight away. Whatever the language, values are in euros (EUR) only.

The distribution terms (any price, and the licence) will be set out at the public release. Either way, Carnet has no accounts and no ads, and it sells no data, because it collects none.

How the source code will be published hasn’t been decided yet. This page will be updated at the public release.