KeyManager Feature

[i5hi]

Now that we have a dedicated Seed model from which many Wallets can be derived, we can introduce the KeyManager/KeyChain that we had discussed.

It would have:

• a dedicated page either in settings or on its own on the homepage alongside NewWallet and Settings
• the Seed page will contain a list of all seeds, newSeeds and recovered backup words
• each seed display row will show how many wallets are derived from it and a Derive Button.
• clicking the seed will show a more detailed page (will need to figure what details are important to show) Refer to optional features
• The Derive Button will first ask to add a passphrase and then show all the available/possible scriptTypes. If a particular passphrase exists for a specific scriptType, it won't be shown in the selection.

Additionally:

• if a user clicks NewWallet, there will be a new button called Derive w/ Passphrase which will redirect to this KeyManager page.

Other notes on behaviour:

• deleting a Wallet will not delete a Seed
• Wallet can be re-derived from the Seed
• deleting a Seed will make a wallet a watch-only of type WalletType.xpub
• if the Seed is reimported, we check if its fingerprint matches an existing Wallet and convert that Wallet back to a spendable wallet of type WalletType.words

Optional features:

• Allow importing a Seed just to sign a psbt: where the Seed details page will have an input box to upload/paste/use-a-saved unsigned psbt and sign it. This function will work offline and can make the wallet operate as a cold storage device where a user only maintains their Wallet as a watch-only and always goes offline to import their Seed and sign a transaction. Can seem like an over-kill but its an advanced feature that I would certainly love and use :100: