Update EIP-6909: Update Transfer Event To Log Caller

Merged by EIP-Bot.

Author: jtriley2p

EIPS/eip-6909.md

@@ -246,7 +246,7 @@ MUST return True.
 
 #### `Transfer`
 
-The `sender` has transferred an `amount` of a token `id` to a `receiver`.
+The `caller` initiates a transfer of an `amount` of a token `id` from a `sender` to a `receiver`.
 
 MUST be logged when an `amount` of a token `id` is transferred from one account to another.
 
@@ -259,14 +259,17 @@ SHOULD be logged with the `receiver` address as the zero address when an `amount
   type: event
 
   inputs:
+    - name: caller
+      indexed: true
+      type: address
     - name: sender
       indexed: true
       type: address
     - name: receiver
       indexed: true
       type: address
     - name: id
-      indexed: true
+      indexed: false
       type: uint256
     - name: amount
       indexed: false
@@ -479,7 +482,7 @@ contract ERC6909 {
     /// @param receiver The address of the receiver.
     /// @param id The id of the token.
     /// @param amount The amount of the token.
-    event Transfer(address indexed sender, address indexed receiver, uint256 indexed id, uint256 amount);
+    event Transfer(address indexed caller, address indexed sender, address indexed receiver, uint256 id, uint256 amount);
 
     /// @notice The event emitted when an operator is set.
     /// @param owner The address of the owner.