Open-Source-Contribution

Originally contributed to: https://github.com/w3-kit/contracts/tree/main/evm

These implementations are written by me.

MultiSig Wallet

• Built a multi-signature wallet requiring multiple approvals for transaction execution
• Implemented proposal → approval → execution workflow
• Managed signer set and approval thresholds
• Ensured secure execution by validating confirmations before transaction execution
• Contributed to: w3-kit multisig
• Detailed Explanation: learn.md

ERC20 Token

• Built a standard-compliant ERC20 token contract
• Implemented core functions: transfer, approve, transferFrom
• Designed allowance mechanism and balance updates
• Ensured correct event emission (Transfer, Approval)
• Contributed to: w3-kit token-erc20
• Detailed Explanation: learn.md

ERC721 NFT+Royalties

• Built a standard-compliant ERC721 NFT contract
• Added metadata-URI, Enumerable and Royalties (ERC2981) extensions
• Implemented core functions: _safemint, setDefaultRoyalty, tokenURI, supportsInterface
• Ensured event emission on setDefaultRoyalty
• Contributed to: w3-kit nft-erc721
• Detailed Exmplanation: learn.md

ERC1155 Multi-Token

• Built an Openzeppelin Supported ERC1155 Multi Token Contract
• Added Roles for DEPLOYER, MINTER, URI_SETTER
• Implemented core functions: Mint, MintBatch
• Ensured Input Validation and applied Custom Errors for gas optimization
• Contributed to: w3-kit erc-1155
• Detailed Explanation: learn.md

Subscriptions

• ERC20 token based recurring payments
• Merchant registration and plan management
• Subscriber controls — pause, resume, and cancel
• Manual Renewal
• Merchant withdrawal logic
• Hardhat test suite
• Contributed to: w3-kit subscription
• Detailed Explanation: learn.md