WIP:Draft

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NIP-XX
======
Nostr specific keys from Ethereum wallet signatures
----------------------------------------------------
`draft` `optional` `author:0xc0de4c0ffee` `author:sshmatrix`
This NIP ?is optional specification for Nostr clients to generate private key from deterministic Ethereum wallet signatures.
A) Username :
```
let username = "mypetname" || "mynip05@domain.eth.limo" || "domain.eth.limo" || "sub.domain.eth.limo"
```
1) `mypetname` is NIP02 compatible name
2) `mynip05@domain.eth.limo` is NIP05 compatible ID
3) `domain.eth.limo` is NIP05 equivalent to `_@domain.eth.limo`
4) `sub.domain.eth.limo` is NIP05 equivalent to `_@sub.domain.eth.limo`
~~Implementing clients should verify if generated public keys match NIP05 and NIP02 records.~~
B) Message :
```
let message = `Login to Nostr as ${username}\n\nWARNING : DO NOT SIGN THIS REQUEST FROM UNTRUSTED NOSTR CLIENTS.\n${checksum(wallet.address)}`
```
C) Private Key :
```js
import { hkdf } from '@noble/hashes/hkdf';
import { sha256 } from '@noble/hashes/sha256';
import * as secp256k1 from '@noble/secp256k1';
let username = 'name@domain.eth.limo';
let optPassword = "horse staple battery";
// optional pin/password
let address = wallet.getAddress();
// get checksum'd address from eth wallet
let signature = wallet.signMessage(message);
// request signature from eth wallet
// 0x + bytes1 + bytes32 + bytes32
// 2 + (2 + 64 + 64) = 132 length
let inputKey = sha256(signature);
let salt = sha256(`nostr:${username}:${optPassword}:${signature.slice(68)}`); //68~132
// nostr:${username}:${signature.slice(68)}
let info = `nostr:${username}:${address}`;
let dkLen = 42; // 32 + 8 + 2
//FIPS 186 B.4.1 limit must be >=keylen+8
let hashKey = hkdf(sha256, inputKey, salt, info, dkLen);
let privKey = nobleSecp256k1.hashToPrivateKey(hashKey);
//FIPS 186 B.4.1 @noble/secp256k1
let pubKey = nobleSecp256k1.getPublicKey(privKey)
```