OpenZeppelin + Remix + BNB smart chain
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Tutorial on how to create tokens and deploy them to blockchain
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OpenZeppelin + Remix + BNB smart chain
- 1. OPENZEPPELIN + REMIX + BNB SMART CHAIN ERC-20, ERC-721 TOKENS Solidity Smart Contract refresher Tokens and token standards: ERC-20 and ERC-721 OpenZeppelin 5/6/2021
- 2. SMART CONTRACTS Smart contracts in 5 minutes or less
- 4. SMART CONTRCTS ON BLOCKCHAIN Byte Code LLL Vyper Solidity New block ABI
- 6. SMART CONTRACT CODE EXAMPLE
- 7. BYTECODE/OPCODE PUSH1 0x80 PUSH1 0x40 MSTORE CALLVALUE DUP1 ISZERO PUSH1 0xF JUMPI PUSH1 0x0 DUP1 REVERT JUMPDEST POP PUSH1 0xAB DUP1 PUSH2 0x1E PUSH1 0x0 CODECOPY PUSH1 0x0 RETURN INVALID PUSH1 0x80 PUSH1 0x40 MSTORE CALLVALUE DUP1 ISZERO PUSH1 0xF JUMPI PUSH1 0x0 DUP1 REVERT JUMPDEST POP PUSH1 0x4 CALLDATASIZE LT PUSH1 0x32 JUMPI PUSH1 0x0 CALLDATALOAD PUSH1 0xE0 SHR DUP1 PUSH4 0x2E64CEC1 EQ PUSH1 0x37 JUMPI DUP1 PUSH4 0x6057361D EQ PUSH1 0x4C JUMPI JUMPDEST PUSH1 0x0 DUP1 REVERT JUMPDEST PUSH1 0x0 SLOAD PUSH1 0x40 MLOAD SWAP1 DUP2 MSTORE PUSH1 0x20 ADD PUSH1 0x40 MLOAD DUP1 SWAP2 SUB SWAP1 RETURN JUMPDEST PUSH1 0x5C PUSH1 0x57 CALLDATASIZE PUSH1 0x4 PUSH1 0x5E JUMP JUMPDEST PUSH1 0x0 SSTORE JUMP JUMPDEST STOP JUMPDEST PUSH1 0x0 PUSH1 0x20 DUP3 DUP5 SUB SLT ISZERO PUSH1 0x6E JUMPI DUP1 DUP2 REVERT JUMPDEST POP CALLDATALOAD SWAP2 SWAP1 POP JUMP INVALID LOG2 PUSH5 0x6970667358 0x22 SLT KECCAK256 0xE1 0xB8 0xD0 DUP8 0xE8 DUP4 0x22 PUSH28 0xC716E567D1D88DE9038140C655CE12488AFFAA4436CAA74264736F6C PUSH4 0x43000803 STOP CALLER
- 8. ABI [… { "inputs": [ { "internalType": "uint256", "name": "num", "type": "uint256" } ], "name": "store", "outputs": [], "stateMutability": "nonpayable", "type": "function" } ]
- 9. DEMO
- 10. ERC-20 Tokens in 5 minutes or less
- 11. ERC-20 ERC-20 has emerged as the technical standard; it is used for all smart contracts on the Ethereum blockchain for token implementation and provides a list of rules that all Ethereum-based tokens must follow. FUNCTIONS • totalSupply() • balanceOf(account) • transfer(recipient, amount) • allowance(owner, spender) • approve(spender, amount) • transferFrom(sender, recipient, amount) EVENTS • Transfer(from, to, value) • Approval(owner, spender, value)
- 12. ERC-20 IS THE MOST POPULAR TOKEN STANDARD
- 13. COMMON ERC-20 EXTENSIONS – NAME,SYSMBOL, DECIMALS constructor(name, symbol, decimals) name() symbol() decimals()
- 14. OPENZEPPELIN 4.0
- 15. OPENZEPPELIN CONTRACTS TOKENS TOKENS ACCESS CONTROLS FINANCE GOVERNANCE META TRANSACTION OpenZeppelin Contracts is a library for secure smart contract development. It provides implementations of standards like ERC20 and ERC721 which you can deploy as-is or extend to suit your needs, as well as Solidity components to build custom contracts and more complex decentralized systems.
- 16. OPENZEPPELIN BENEFITS Open-source (MIT License) Implementations of standards like ERC20 and ERC721. Flexible role-based permissioning scheme. Reusable Solidity components to build custom contracts and complex decentralized systems. First-class integration with the Gas Station Network for systems with no gas fees! Audited by leading security firms
- 17. REMIX IDE by Ethereum.org
- 18. REMIX IDE
- 19. WHY REMIX? •Ethereum integration •Blockchain emulator •Remix can support both Solidity and Viper •Many plugin related to smart contract development, testing, and documentation •Visual debugger •Selection of compiler version
- 20. BINANCE SMART CHAIN IDE by Ethereum.org
- 21. BINANCE CHAINS Binance Chain Lunched April 2019 Enables users to send and receive BNB Uses Tendermint BFT consensus Users can use DEX Binance Smart Chain Lunched September 2020 Enables decentralized applications EVM Compatible Proof of Stake Authority (PoSA) On-Chain Governance Interoperability and Cross-Chain Transfer (using BNB)
- 23. ALL TOGETHER NOW OpenZeppelin + Remix + BNB Smart Chain
- 24. 1. CREATE ERC-20 TOKEN WITH OPENZEPPELIN
- 25. 2. OPEN CODE IN REMIX IDE
- 26. 4. DEPLOY
- 27. 5. CHECK
- 28. 6. SEND TOKEN TO ANOTHER ACCOUNT
- 29. 7. CHECK ON BSCSCAN
- 30. STAY IN TOUCH Gene Leybzon https://www.linkedin.com/in/leybzon/ https://www.meetup.com/members/90744 20/ https://www.leybzon.com
Notas do Editor
- // SPDX-License-Identifier: GPL-3.0 pragma solidity >=0.7.0 <0.9.0; /** * @title Storage * @dev Store & retrieve value in a variable */ contract Storage { uint256 number; /** * @dev Store value in variable * @param num value to store */ function store(uint256 num) public { number = num; } /** * @dev Return value * @return value of 'number' */ function retrieve() public view returns (uint256){ return number; } }
- // SPDX-License-Identifier: GPL-3.0 pragma solidity >=0.7.0 <0.9.0; /** * @title Storage * @dev Store & retrieve value in a variable */ contract Storage { uint256 number; /** * @dev Store value in variable * @param num value to store */ function store(uint256 num) public { number = num; } /** * @dev Return value * @return value of 'number' */ function retrieve() public view returns (uint256){ return number; } }
- "6080604052348015600f57600080fd5b5060ab8061001e6000396000f3fe6080604052348015600f57600080fd5b506004361060325760003560e01c80632e64cec11460375780636057361d14604c575b600080fd5b60005460405190815260200160405180910390f35b605c6057366004605e565b600055565b005b600060208284031215606e578081fd5b503591905056fea2646970667358221220e1b8d087e883227bc716e567d1d88de9038140c655ce12488affaa4436caa74264736f6c63430008030033"
- [ { "inputs": [], "name": "retrieve", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "uint256", "name": "num", "type": "uint256" } ], "name": "store", "outputs": [], "stateMutability": "nonpayable", "type": "function" } ]
- 1. how tokens can be transferred by its owner? 2. how tokens can be transferred on behalf of an owner? 3. how to get data about the token? 4. events about the token
- https://docs.openzeppelin.com/contracts/4.x/api/token/erc20#IERC20
- https://docs.openzeppelin.com/openzeppelin/
- https://docs.openzeppelin.com/contracts/4.x https://github.com/OpenZeppelin/
- https://remix-ide.readthedocs.io/en/latest/
- Ethereum Studio - popular alternative
- https://docs.binance.org/blockchain.html
- https://www.binance.com/en/blog/421499824684901264/Experience-BTCB--Bitcoin-on-Binance-Smart-Chain
- https://docs.openzeppelin.com/contracts/4.x/wizard
- https://remix.ethereum.org/?#code=Ly8gU1BEWC1MaWNlbnNlLUlkZW50aWZpZXI6IE1JVApwcmFnbWEgc29saWRpdHkgXjAuOC4wOwoKaW1wb3J0ICJAb3BlbnplcHBlbGluL2NvbnRyYWN0c0A0LjEuMC90b2tlbi9FUkMyMC9FUkMyMC5zb2wiOwoKY29udHJhY3QgTWVldHVwVG9rZW4gaXMgRVJDMjAgewogICAgY29uc3RydWN0b3IoKSBFUkMyMCgiTWVldHVwVG9rZW4iLCAiTVQiKSB7CiAgICAgICAgX21pbnQobXNnLnNlbmRlciwgMSAqIDEwICoqIGRlY2ltYWxzKCkpOwogICAgfQp9Cg
- https://remix.ethereum.org/?#code=Ly8gU1BEWC1MaWNlbnNlLUlkZW50aWZpZXI6IE1JVApwcmFnbWEgc29saWRpdHkgXjAuOC4wOwoKaW1wb3J0ICJAb3BlbnplcHBlbGluL2NvbnRyYWN0c0A0LjEuMC90b2tlbi9FUkMyMC9FUkMyMC5zb2wiOwoKY29udHJhY3QgTWVldHVwVG9rZW4gaXMgRVJDMjAgewogICAgY29uc3RydWN0b3IoKSBFUkMyMCgiTWVldHVwVG9rZW4iLCAiTVQiKSB7CiAgICAgICAgX21pbnQobXNnLnNlbmRlciwgMSAqIDEwICoqIGRlY2ltYWxzKCkpOwogICAgfQp9Cg
- https://testnet.bscscan.com/tx/0x2e1968bcbecbe1bc456fafd51c346e74011df2200fbad75b565cee3bb0d9c48e