changes to account spec to update X3DH

x9.md

@@ -1,4 +1,4 @@
-# Status Account Creation and Maintenance Specification
+# Status Account
 
 ## Summary
 
@@ -16,37 +16,42 @@ Everything else associated with the contact is either verified or derived from t
 ### 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)
+    - 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)
+    - 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?)
+- Status follows the X3DH prekey bundle scheme that Open Whisper Systems outlines [in their documentation](https://signal.org/docs/specifications/x3dh/#the-x3dh-protocol) with the following exceptions:
+    - Because there are no central servers, we do not publish one-time keys `OPK` or perform DH including them. 
+- A client MUST create X3DH prekey bundles, each defined by the following items:
+    - Identity Key: `IK`
+    - Signed prekey: `SPK`
+    - Prekey signature: `Sig(IK, Encode(SPK))`
+    - Timestamp
+- These bundles are made available in a variety of ways, as defined in section 2.1.
 
 ## 2 Account Broadcasting
 - A user is responsible 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 
+- A client SHOULD regenerate a new X3DH prekey bundle every 24 hours.  This MAY be done in a lazy way, such that a client that does not come online past this time period does not regenerate or broadcast bundles.
+- The current bundle MUST be broadcast on a whisper topic specific to his Identity Key, `{IK}-contact-code`, intermittently.  This MAY be done every 6 hours.
+- A bundle MUST accompany every message sent.
+- TODO: retreival of long-time offline users bundle via `{IK}-contact-code` 
 
 ## 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
+- 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`). 
 
 ### 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.
+- 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