Update ERC-6909: Remove totalSupply, add authors

Merged by EIP-Bot.

ERCS/erc-6909.md

@@ -2,7 +2,7 @@
 eip: 6909
 title: Minimal Multi-Token Interface
 description: A minimal specification for managing multiple tokens by their id in a single contract.
-author: Joshua Trujillo (@jtriley-eth)
+author: JT Riley (@jtriley-eth), Dillon (@d1ll0n), Sara (@snreynolds), Vectorized (@Vectorized)
 discussions-to: https://ethereum-magicians.org/t/eip-6909-multi-token-standard/13891
 status: Draft
 type: Standards Track
@@ -40,26 +40,6 @@ The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "S
 
 ### Methods
 
-#### `totalSupply`
-
-The total `amount` of a token `id` that exists.
-
-MUST be equal to the sum of the `balanceOf` of all accounts of the token `id`.
-
-```yaml
-- name: totalSupply
-  type: function
-  stateMutability: view
-
-  inputs:
-    - name: id
-      type: uint256
-
-  outputs:
-    - name: amount
-      type: uint256
-```
-
 #### `balanceOf`
 
 The total `amount` of a token `id` that an `owner` owns.
@@ -250,9 +230,9 @@ The `caller` initiates a transfer of an `amount` of a token `id` from a `sender`
 
 MUST be logged when an `amount` of a token `id` is transferred from one account to another.
 
-SHOULD be logged with the `sender` address as the zero address when an `amount` of a token `id` is minted.
+MUST be logged with the `sender` address as the zero address when an `amount` of a token `id` is minted.
 
-SHOULD be logged with the `receiver` address as the zero address when an `amount` of a token `id` is burned.
+MUST be logged with the `receiver` address as the zero address when an `amount` of a token `id` is burned.
 
 ```yaml
 - name: Transfer
@@ -497,9 +477,6 @@ contract ERC6909 {
     /// @param amount The amount of the token.
     event Approval(address indexed owner, address indexed spender, uint256 indexed id, uint256 amount);
 
-    /// @notice The total supply of each id.
-    mapping(uint256 id => uint256 amount) public totalSupply;
-
     /// @notice Owner balance of an id.
     mapping(address owner => mapping(uint256 id => uint256 amount)) public balanceOf;
 
@@ -571,14 +548,12 @@ contract ERC6909 {
     function _mint(address receiver, uint256 id, uint256 amount) internal {
       // WARNING: important safety checks should precede calls to this method.
       balanceOf[receiver][id] += amount;
-      totalSupply[id] += amount;
       emit Transfer(msg.sender, address(0), receiver, id, amount);
     }
 
     function _burn(address sender, uint256 id, uint256 amount) internal {
       // WARNING: important safety checks should precede calls to this method.
       balanceOf[sender][id] -= amount;
-      totalSupply[id] -= amount;
       emit Transfer(msg.sender, sender, address(0), id, amount);
     }
 }