The document discusses creating an ERC-20 token on the Binance Smart Chain using OpenZeppelin and Remix IDE. It provides an overview of ERC-20 standards, describes how to create an ERC-20 token contract using OpenZeppelin, edit the code in Remix, deploy it to BSC testnet, and check that the token was successfully created and transferred between accounts.

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

3. SMART CONTRACTS

4. SMART CONTRCTS ON
BLOCKCHAIN
Byte Code
LLL
Vyper
Solidity
New block
ABI

5. SMART CONTRACT EXAMPLE

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