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phonewallet: add level up

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phonewallet.md
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# Phone as a wallet
How to store bitcoin on a clean Android or iPhone secured with multisignature in the Blockstream Green Wallet
A guide to store bitcoin on a clean Android or iPhone secured with multisignature in the Blockstream Green Wallet.
A recommendation to people who are looking into how to take custody of their first satoshis and not running their own node yet
A recommendation to people who are looking into how to take custody of their first satoshis and not running their own node yet.
## Why a phone?
* generic hardware (there is no suggestion of it containing valuable keys)
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* apply the most strict privacy settings and log in to only the bare minimum services
* apply the strongest possible PIN or passphrase to the lock screen (store in a password manager), avoid biometrics
* download the Blockstream Green wallet from the [App Store](https://apps.apple.com/us/app/green-bitcoin-wallet/id1402243590) / [Play Store](https://play.google.com/store/apps/details?id=com.greenaddress.greenbits_android_wallet) / [F-droid](https://f-droid.org/en/packages/com.greenaddress.greenbits_android_wallet/) / [GitHub](https://github.com/Blockstream/green_android/releases)
* set up Green Wallet with the 6 character PIN and [Two-Factor Authentication (2FA)](https://help.blockstream.com/hc/en-us/articles/900001388366-What-does-Blockstream-Green-s-multisig-protect-from-)
* [set up Green Wallet](https://help.blockstream.com/hc/en-us/articles/900002327003-How-do-I-create-a-new-wallet-) with the 6 character PIN and [Two-Factor Authentication (2FA)](https://help.blockstream.com/hc/en-us/articles/900001388366-What-does-Blockstream-Green-s-multisig-protect-from-)
## Further advice
* if using email don't login to the email account on the same device - use a dedicated, unique, pseudonymous email with end-to-end encrypted providers like [Protonmail](https://protonmail.com/) or [TutaNota](https://tutanota.com/)
* if using TOTP authentication (Google Authenticator / Authy) don't store it on the same device
* Set up a password manager. [Bitwarden](https://bitwarden.com/) is a good open-source option with default free encrypted cloud storage and self hosting ability.
* if using email do not login to the email account on the same device - use a dedicated, unique, pseudonymous email with end-to-end encrypted providers like [Protonmail](https://protonmail.com/) or [TutaNota](https://tutanota.com/) - store the login in a password manager
* if using TOTP authentication (Google Authenticator / Authy) don't run it on the same device and store the secret in a password manager
* always connect through Tor, it is built in to Green (helps avoiding connecting the IP address with the bitcoin stored while querying Blockstream's server)
* carefully note the 24 words seed down to paper ([pencil lasts more then ink](https://en.bitcoin.it/wiki/Seed_phrase#Paper_and_Pencil_Backup)) / etch into metal and store in a safe place
* it is the safest to store the phone switched off (the encryption key leaves the memory and not only protected by the lockscreen)
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## Watch-only wallet
* on an other device (can be a day-to-day used phone or desktop) set up Blockstream Green in [watch only mode](https://help.blockstream.com/hc/en-us/articles/900003101806-What-is-watch-only-mode-)
* the watch only wallet can be used to generate addresses and monitor the funds on the blockchain.
* there is no risk of losing the funds if the watch-only device is lost/stolen/compromised (it only contains the public keys, not touching the private ones)
* there is no risk of losing the funds if the watch-only device is lost, stolen or compromised (it only contains the public keys, not touching the private ones)
## Using a custom firmware
* a locked bootloader is a must - check on Android with:
@@ -50,10 +51,21 @@ A recommendation to people who are looking into how to take custody of their fir
* [GrapheneOS](https://grapheneos.org/) compatible with Pixel devices
* [CalyxOS](https://calyxos.org/) for Pixels and the Xiaomi Mi A2
## More reading:
## Resources
* [Video setup](https://help.blockstream.com/hc/en-us/categories/900000056183-Blockstream-Green/)
* [Blockstream Green docs](https://help.blockstream.com/hc/en-us/categories/900000056183-Blockstream-Green/)
* [GreenAddress Recovery](https://github.com/greenaddress/garecovery)
* [How secure is full-disk encryption technology on LineageOS, or Android phones in general?](https://security.stackexchange.com/questions/210994/how-secure-is-full-disk-encryption-technology-on-lineageos-or-android-phones-in)
* [GreenAddress Recovery](https://github.com/greenaddress/garecovery)
## Level up
* [Single seed multi-location backup schemes](https://github.com/openoms/bitcoin-tutorials/blob/master/backups/README.md)
The aim is to create 3 packages of cryptographically secure backups where the funds cannot be recovered from any single package, but can be recovered with the combination of any two.
Can be thought of as a physical 2-of-3 multisig solution.
* [10x Security Bitcoin Guide](https://btcguide.github.io/)
How to store bitcoin without any single point of failure.
Multisig security is a difference in kind and not in degree. It affords you the ability to avoid loss while making 1 (or more) catastrophic failures in securing your bitcoin. By using a security system that is fault-tolerant, you can move much faster (with less caution) through each step and still attain far higher levels of security vs any single-key system. This guide will show you how.