NFT Wallet

Browser extension for NFT-linked smart contract wallet

Web3 projects are issuing points to attract users, but their point system is mostly stored off-chain and tied to EOA (Externally Owned Accounts) wallets. That means in order to transfer points to others, one must provide the EOA wallet private key and that's a very insecure process.

To tackle this, we are building a unique browser extension for smart contract wallets that are linked with NFTs in the way that owner of the NFT can control the wallet and transferring wallet is now as easy as transferring an NFT. You can use our extension to create smart contract wallets then connect to dApps and make transactions just like you're on Metamask or Rabby.

Key features:

• Create smart account (NFT-linked smart contract wallet) from an EOA wallet
• Connect smart account to dApps and interact with their smart contracts
• Transfer smart account to other address via NFT transfer

Technical solution

In our extension, we:

• adopt ERC-6551 Token bound accounts which enable ERC-721 NFT to function as smart contract wallet.
• modify browser extension connection flow to make smart wallet connect to dApps as if it is an EOA wallet.
• wrap transaction data sent from dApps in order for smart wallet to make arbitrary calls to any contracts.

Functionalities

Create smart account

Connect with dapps and make transactions

Transfer wallet

Contracts

Deploy:

forge script  --rpc-url $RPC_URL --private-key $PRIVATE_KEY --broadcast contracts/script/DeployTBAHelper.s.sol
forge script  --rpc-url $RPC_URL --private-key $PRIVATE_KEY --broadcast contracts/script/DeployFree2MintNFTWallet.s.sol

NOTE

You can pre-compute NFT and TBAHelper contract deployment address by using the following command

forge script contracts/script/ComputeAddresses.s.sol

Free2Mint deploy address should be 0xD629BB82c2217cE32Ff91143aed0816E26BaF397 TBAHelper Address should be 0x18e49629A34bf735ED1816216ac754921AF26080

Verify contact

forge verify-contract --chain-id 137 0xD629BB82c2217cE32Ff91143aed0816E26BaF397 contracts/src/Free2MintNFTWallet.sol:Free2MintNFTWallet
forge verify-contract --chain-id 137 0x18e49629A34bf735ED1816216ac754921AF26080 contracts/src/TBAHelper.sol:TBAHelper

Deployments address

Free2MintWallet

This contract is NFT contract we used to associate with smart account.

EVM Network	Chain ID	Registry Address
Polygon	137	0xD629BB82c2217cE32Ff91143aed0816E26BaF397
Polygon zkEvm Goerli	1442	0xD629BB82c2217cE32Ff91143aed0816E26BaF397
Linea Goerli	59140	0xD629BB82c2217cE32Ff91143aed0816E26BaF397

TBA Helper

Helper contract to mint NFT then create smart account which is associated with that NFT.

EVM Network	Chain ID	Registry Address
Polygon	137	0x18e49629A34bf735ED1816216ac754921AF26080
Polygon zkEvm Goerli	1442	0x18e49629A34bf735ED1816216ac754921AF26080
Linea Goerli	59140	0x18e49629A34bf735ED1816216ac754921AF26080

ERC-6551 Registry This contract is used to create and get smart account.

EVM Network	Chain ID	Registry Address
Polygon	137	0x000000006551c19487814612e58FE06813775758
Polygon zkEvm Goerli	1442	0x000000006551c19487814612e58FE06813775758
Linea Goerli	59140	0x000000006551c19487814612e58FE06813775758

Token bound account Proxy

Use this address as the implementation parameter when calling createAccount on the registry

EVM Network	Chain ID	Account Proxy Address
Polygon	137	0x55266d75D1a14E4572138116aF39863Ed6596E7F
Polygon zkEvm Goerli	1442	0x55266d75D1a14E4572138116aF39863Ed6596E7F
Linea Goerli	59140	0x55266d75D1a14E4572138116aF39863Ed6596E7F

Token bound account Implementation

Use this address as the implementation parameter when calling initialize on a created account

EVM Network	Chain ID	Account Implementation Address
Polygon	137	0x41C8f39463A868d3A88af00cd0fe7102F30E44eC
Polygon zkEvm	1442	0x41C8f39463A868d3A88af00cd0fe7102F30E44eC
Linea Goerli	59140	0x41C8f39463A868d3A88af00cd0fe7102F30E44eC

Extension

Get started

Requirements:

• Node 16
• Yarn

Install dependencies:

$ yarn

Environment variables

• About Krystal related environment variables, please contact us to get the values
• About Multicall and Mutlisend, please use any multicall/multisend contracts on chain you want to use
• About TBA related env, please refer below list of addresses in contracts section

Build extension

$ yarn build

After this step, a folder build is generated. To add this to Chrome extension locally, first enable developer mode and press Load unpacked button the build folder

Development

$ yarn start

Then load folder dev instead of build