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Wallet creation: Make mnemonic length configurable, default to 24 words. (#1697)

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## Issue Addressed

Fixes #1665.

## Proposed Changes

`lighthouse account_manager wallet create` now generates a 24-word
mnemonic. The user can override this by passing `--mnemonic-length 12`
(or another legal bip39 length).

## Additional Info

CLI `--help`:
```
        --mnemonic-length <MNEMONIC_LENGTH>       The number of words to use for the mnemonic phrase. [default: 24]
```

In case of an invalid argument:
```
% lighthouse account_manager wallet create --mnemonic-length 25
error: Invalid value for '--mnemonic-length <MNEMONIC_LENGTH>': Mnemonic length must be one of 12, 15, 18, 21, 24
```
This commit is contained in:
Geoffry Song
2020-10-02 07:51:50 +00:00
parent b56dbc3ba0
commit 2cc20101d4
4 changed files with 40 additions and 12 deletions
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8
book/src/become-a-validator-source.md
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@@ -97,9 +97,9 @@ lighthouse --testnet medalla account wallet create
You will be prompted for a wallet name and a password. The output will look like this:
```
Your wallet's 12-word BIP-39 mnemonic is:
Your wallet's 24-word BIP-39 mnemonic is:
thank beach essence clerk gun library key grape hotel wise dutch segment
glad marble art pelican nurse large guilt response brave affair kite essence welcome gauge peace once picnic debris devote ticket blood bike solar junk
This mnemonic can be used to fully restore your wallet, should
you lose the JSON file or your password.
@@ -114,12 +114,12 @@ a piece of paper and storing it in a safe place would be prudent.
Your wallet's UUID is:
e762671a-2a33-4922-901b-62a43dbd5227
1c8c13d5-d065-4ef7-bad3-14e9d8146140
You do not need to backup your UUID or keep it secret.
```
**Don't forget to make a backup** of the 12-word BIP-39 mnemonic. It can be
**Don't forget to make a backup** of the 24-word BIP-39 mnemonic. It can be
used to restore your validator if there is a data loss.
### 4.2 Create a Validator from the Wallet