Proton... the people who made Protonmail (which is supposedly private? I use it. Conspiracy theories abound...) has just come out with a web based bitcoin wallet.
https://proton.me/walletAt a glance it seems fairly good. Very simple, but seems to be built correctly for the tradeoffs chosen.
-Open source:
https://github.com/protonwallet/-100% SELF CUSTODIAL. They do nothing other than hold encrypted data (if you trust them...). Your keys.
-E2E encrypted
-Only you have your keys
*-Standard 12 word seed that will work elsewhere
-Seamlessly lets you send bitcoin via email (have not tried this but sounds interesting)
-Uses (without any credit seemingly?) their own implementation of Blockstream's block explorer.
**I would like to see it allow for a BIP-39 passphrase to add a layer of security. but that said...
*Anything that runs in a browser window already has attack surface that otherwise would not be there.
**Block explorers are leaky and can be used in coin analysis and tracking. In fact Proton could sell the queries made by their customers to coin analysis firms and thereby create links to BTC addresses/tx and IPs. Of course this is true for ANY block explorer you use unless you run your own (and audit the code you use... ha) Feel free to use mine if you can stand waiting on a TOR connection. I will not sell your data or even look at it.
TRUST ME. (lol)
http://emnjmgvibqwy5xncae3rekyitxxh2acc57sicmscfbnilsliqrfc3gad.onion/
Thanks for this.
I have only good words to say about Proton. I've been using their secure (and free) email services without problems. It's the cleanest and most security-oriented web-mail service I've found. OTOH, in most free services, the product is YOU, but I'd like to think Proton is an exception.