Import account creation doc by Corey

https://notes.status.im/6IN8H23dT9-xEM6Xov4Slw?view

README.md

@@ -29,6 +29,7 @@ Drafts are prepended with x to indicate that they aren't accepted yet.
 | x6   | [Initial Conversational Security Specification](x6.md) |
 | x7   | [Initial Transport Privacy through Whisper Specification](x7.md) |
 | x8   | [Initial Message Payload Specification Specification](x8.md) |
+| x9   | [Status Account Creation and Maintenance Specification](x9.md)                    |
 
 ## Protocol Research
 

x9.md

@@ -0,0 +1,57 @@
+# Status Account Creation and Maintenance Specification
+
+## Summary
+
+The core concept of an account in Status is a set of cryptographic keypairs.  Namely, the combination of the following:
+1. a whisper chat identity keypair
+1. a set of cryptocurrency wallet keypairs
+
+Everything else associated with the contact is either verified or derived from the above items, including:
+- Ethereum address (future verification, currently the same base keypair)
+- 3 word mnemonic name
+- identicon
+- message signatures
+
+## 1 Initial Key Generation
+### 1.1 Public/Private Keypairs 
+- An ECDSA (secp256k1 curve) public/private keypair MUST be generated via a [BIP43](https://github.com/bitcoin/bips/blob/master/bip-0043.mediawiki) derived path from a [BIP39](https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki) mnemonic seed phrase.
+- The default paths are defined as such:
+    - Whisper Chat Key ($IK$): `m/43'/60'/1581'/0'/0`  (post Multiaccount integration)
+        - following [EIP1581](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1581.md)
+    - DB encryption Key ($DBK$): `m/43'/60'/1581'/1'/0` (post Multiaccount integration)
+        - following [EIP1581](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1581.md)
+    - Status Wallet paths: `m/44'/60'/0'/0'/i` starting at `i=0`
+        - following [BIP44](https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki)
+        - NOTE: this (`i=0`) is also the current (and only) path for Whisper key before Multiaccount integration
+
+### 1.2 X3DH Prekey bundle creation
+- A client must create an amount of X3DH prekey bundles, each defined by the following items:
+    - Identity Key: $IK$
+    - Signed prekey: $SPK$
+    - Prekey signature: $Sig(IK, \text{Encode}(SPK)$)
+    - one-time prekey: $OPK$ (???? need this?)
+
+## 2 Account Broadcasting
+- A user is reponsible for broadcasting certain information publicly so that others may contact them.
+
+### 2.1 X3DH Prekey bundles
+- A client [MUST/SHOULD] regenerate a group of X3DH prekey bundles every 24 hours and broadcast them through the appropriate channels 
+
+## 3 Optional Account additions
+### 3.1 ENS Username
+- A user MAY register a public username on the Ethereum Name System (ENS).  This username is a user-chosen subdomain of the `stateofus.eth` ENS registration that maps to their whisper identity key ($IK$). 
+    - TODO: verify if this is contact code or public key
+
+### 3.2 User Chosen Name
+- An account MAY create a display name to replace the $IK$ generated 3-word pseudonym in chat screens.  This chosen display name will become part of the publicly broadcasted profile of the account.
+
+### 3.3 User Profile Picture
+- An account MAY edit the $IK$ generated identicon with a chosen picture.  This picture will become part of the publicly broadcasted profile of the account.
+
+### 3.4 Tribute to Talk
+- TODO - Couched until later
+
+### 3.5 Wallet Accounts
+- TODO (based in multiaccount)
+
+## Security Implications