Curcifer Tech

Blockchain wallet, Smart contract, ERC20

• •
  • Learning
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  • blockchain

Hello people, This chapter we will code an interesting smart contract for Jumbo Lottery Simulator.
Let’s learning together to create smart contract on evm compatible Blockchain with Solidity.
First before we begin the journey to code the smart contract, we need to know first about the wallet.

Wallet

Blockchain Wallet / Crypto Wallet

In order to interract or transact in the blockchain, we need a wallet to store our cryptocurrencies.

there are 2 types of wallet that I know so far:

  1. Custodial Wallet
  2. Non-Custodial Wallet

Custodial Wallet

As the name mentioned, the wallet is managed by the 3rd parties.

So if anything happen to your wallet, you can have many action provided by your wallet provider, such as freeze account, recover account, transaction report, etc.

Pros:

  • Easy to use
  • Provide many blockchain
  • Many cool feature like defi, borrow, lending, exchange, etc.
  • Support available

Cons:

  • you put your key to the wallet provider to manage it for you, so if the company broke or hacked, sometimes you will lost your funds as well.
  • recovery wallet sometimes very tedious work to do, sometimes need to wait from support.
  • need to input various information, such as, ekyc, phone number, email, etc.

Non Custodial Wallet

Also as the name mentioned, the wallet will be managed by you only, no 3rd parties going to manage it for you.

The Non Custodial wallet is like you on your own, we have responsibility to secure our own data, keys, etc.

There is no perfect Application, all also contain bug. but for non custodial wallet, as long as you save your key securely, if something happen on your wallet, you will still can recover to any wallet.

Pros:

  • Provide many blockchain too (for some wallet like MM)
  • Can recover wallet anytime anywhere if you have your mnemonic phrases.
  • can recover account anytime anywhere if you have your private keys.
  • Customize Network and many more (depends on the wallet)
  • Can be used directly, no additional private info need to input (email, password, ekyc, etc)

Cons:

  • Need little bit knowledge to use
  • Support only available for wallet related software (bug, ui, crash, etc).
  • No transaction report (Usually for reporting tax).
  • You will responsible for your own security.

It depends on your need, wise people will use both of them to action.

also if you know about cold-wallet and hot-wallet, both of them also have types like explained above. cold-wallet non-custodial hot-wallet custodial hot-wallet non-custodial

but I feel some cold-wallet is also custodial (let me know if you found custodial part of cold-wallet xD)

so I hope not confusing you, please give me your opinion too :)

FYI:

In Metamask to add custom token by tap import token

after you confirmed correctly the name (usually it is autogenerated after you paste the contract address of your custom erc20), click the add custom token

after that you will see your erc20 token added to your mm wallet list token.


Alright I guess we know little bit about what is wallet.

Smart Contract

Smart Contract

The Smart Contract is actually a simple program that written on blockchain to execute transaction or interraction with the blockchain based on predetermined condition and verification.

There are many language to write smart contract which is:

  • Solidity
  • Rust
  • Vyper
  • Yul and many more.

each of language has it’s own pros and cons, so you can choose one is the best for you. currently I am comfortable using Solidity, since first time learning about smart contract programming.

In this chapter we are going to code smart contract with Solidity.

Notes

If you see carefully when scanning smart contract in a blockchain. Smart contract looks the same like your wallet when you scan on blockchain. have its own wallet, tt can store cryptocurrency.

so basically it is same, only the way to interract with blockchain is based on the code written in the smart contract.

Only It is speedy, efficient, and accurate, since it is automatically do action whenever you trigger their methods that you just wrote or read. There are no intermediates when handling transaction, secured, and transparent. Anybody can see the transaction or any action did by smart contracts.

also before you invest to some defi with smart contract, if you are programmer, make sure there are no malicious code inside the contract (I guess this is the privilege of being a programmer xD)


about the famous ERC20

ERC20

ERC20

Based on what I see when scanning the ERC20 token contract. Overall they are also smart contract.

A special smart contract which conform the protocol of ERC20 on their corresponding blockchain.

if you know about ERC-721 (NFT) which stand for Non-Fungible Token, ERC20 token is Fungible Token mean 1 token represent the same value as other token.

Basically all of it is a smart contract conforming the protocol of corresponding standard in each blockchain.

In this chapter Also I will show you little bit about ERC20.

Notes

Do you know about ERC-1151? this token is sometimes famous to create in metaverse gaming.

Creating in game property like Weapon, accesories, etc.

NFT like but it is Non-Fungible but also Fungible… So what should we call this? semi non fungible token? xD

Give me your opinion on Curcifer Tech Twitter :) I will reply ;X

Please also Check The Videos for more details

programming part is include inside video

Generated Smart contract and ERC20 to mumbai test address:

  • CTT 0xaF3C74F763f1BEc30ab7E082a98816EF2cB7Fb2E
  • Jumbo Simulator 0x7660D1a823Ae70f9D309C4D62DC7Bfc18D4D98aE

you can simply go to https://mumbai.polygonscan.com/address/ paste the address here

Ref:

Okay People, See you on next chapter of Curcifer Tech Channel