Canto Identity Subprotocols contest - felipe's results

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Gas Optimizations

[GAS-1] Use the payable modifier on constructor

Adding the payable modifier on constructor will simplify the initialization bytecode by removing the 'revert if msg.sender is not zero' check, resulting in cheaper contract deployment.

Saves 204 gas per instance

Instances (4):

File: canto-pfp-protocol/src/ProfilePicture.sol

57:    constructor(address _cidNFT, string memory _subprotocolName) ERC721("Profile Picture", "PFP") {

File: canto-bio-protocol/src/Bio.sol

32:    constructor() ERC721("Biography", "Bio") {

File: canto-namespace-protocol/src/Namespace.sol

73:    constructor(
74:        address _tray,
75:        address _note,
76:        address _revenueAddress
77:    ) ERC721("Namespace", "NS") Owned(msg.sender) {

File: canto-namespace-protocol/src/Tray.sol

 98:    constructor(
 99:        bytes32 _initHash,
100:        uint256 _trayPrice,
101:        address _revenueAddress,
102:        address _note,
103:        address _namespaceNFT
104:    ) ERC721A("Namespace Tray", "NSTRAY") Owned(msg.sender) {

[GAS-2] Use immutable on state variables updated only on the constructor

Immutable variables are compiled into the contract's runtime bytecode, being interpreted by the EVM the same way as constants. This change removes the need for the SLOAD instruction when reading the variable and will save 2100 gas when variable is cold and 100 when it's warm.

File: canto-pfp-protocol/src/ProfilePicture.sol

 35:    string public subprotocolName;