Markus zusak

1632731833

Binance Smart Chain Development

Binance Smart chain works along with the Binance chain to deliver an Excellency. Binance Smart chain development is one of the best way to shine in cryptosystem.

Check: https://bit.ly/3o7u5As

#binance  #binancesmartchain #bsc  #blockchain  #cryptoexchanges  #crypto  #cryptocurrency 

Binance Smart Chain Development
John Wilson

John Wilson

1632727894

Best Decentralized Cryptocurrency Exchange Software Providers

Introduction :

The cryptocurrency domain has been evolving ever since its arrival in the digital world. Numerous software platforms have been developed for providing the best digital experience and service to digital audiences. There has been a wide range of cryptocurrency exchanges with unique features that are suitable for an extensive range of audiences. 

Evolution Of Crypto Exchange : 

The evolution of crypto domains has enabled the digital audience to explore an impressive range of protocols and development modules that can be implemented into the growth of business sectors. Thus, it has always been a priority for businesses to utilize the best decentralized cryptocurrency exchange software that is created with the best possible features that can be implemented to a crypto exchange platform.

What Is A Crypto Exchange Platform ?

A cryptocurrency exchange is a decentralized platform that is used to initiate processes like trading, buying, and selling. This platform is extensively preferred by the crypto community due to its integration with the blockchain network. There are various types of blockchain networks such as P2P crypto exchange, decentralized crypto exchange, centralized crypto exchange,  hybrid crypto exchange, etc.

Benefits Of Crypto Exchange :

  • Removal of middlemen like banks and financial institutions.
  • Complete decentralization.
  • Seamless transaction process.
  • Maintains market volatility effectively.

Conclusion :

The growth of digital business platforms is primarily driven by the effectiveness of the cryptocurrency exchange platform. Due to this interesting fact, businesses strive to utilize the best decentralized cryptocurrency exchange software.

#decentralized #defi #blockchain #cryptocurrency #cryptocurrencies #exchanges #trading #software-development #dapps #crypto 

Best Decentralized Cryptocurrency Exchange Software Providers
John Wilson

John Wilson

1632392758

White Label Cryptocurrency Exchange | White-Label Crypto Solutions

Introduction :

The digital space has been completely transformed into a revenue-generating platform in quite some time.  This transformation is because of the arrival of the concept of cryptocurrency exchange. This is an effective platform that is used for the trading, buying, and selling of crypto coins and tokens in a decentralized ecosystem. This platform is built on the power of blockchain technology. Thus, it stores all the data related to every transaction that takes place on this platform. 

White Label Crypto Exchange :

This platform is being primarily adopted by a wide variety of business sectors in the crypto market. Thus, it has transformed into a very important and influential concept in the business world. Every major business enterprise wants to conduct business on this platform and experience great revenue and profits. 

But, developing a cryptocurrency exchange platform from scratch is a very tedious process and it consumes a lot of time and money. To overcome these challenges, the whitelabel concept is used. This concept can be added to the business by availing of top-tier whitelabel cryptocurrency exchange services.

Types Of Cryptocurrency Exchanges :

  • Centralized crypto exchange.
  • Hybrid crypto exchange.
  • Decentralized crypto exchange.
  • P2P crypto exchange.

Benefits Of Using Whitelabel Exchange Platform :

  • Highly customizable.
  • Instant deployment.
  • Instant profits and results.
  • Various blockchains can be used.
  • Market-ready platform.

Conclusion :

The White Label Crypto Trading Software is a suitable solution for business platforms that focus on achieving enormous results in a very short period of time. The whitelabel software also comes with post-marketing solutions which are completely dependent on the beneficial features of the cryptocurrency exchange development company. Thus, availing of effective whitelabel cryptocurrency exchange solutions is an ideal solution for immediate success.

 

#blockchain   #smart_contract   #cryptocurrency   #development_services   #crypto_exchange_platform   #white_label_crypto_exchange


 

White Label Cryptocurrency Exchange | White-Label Crypto Solutions

Markus zusak

1632313535

ICO Marketing Services

Using ICO marketing services is the most powerful way to market your ICO and generate revenue quickly.

Check: https://bit.ly/3EK3cbu

#ico  #icomarketing  #initialcoinoffering  #icomarketingservices  #icodevelopment  #icoservice  #crowdfunding  #crowdfundingplatform  #crypto  #cryptocurrency  #blockchain  #cryptocurrencies 

ICO Marketing Services
isa charlotte

isa charlotte

1632139067

Forsage Clone: Launch A 100% Decentralized Smart Contract MLM Platform

Smart contracts, blockchain, and crypto technology have had an influence on nearly every area we have ever known. The blockchain bug has also bitten multilevel marketing, or MLM as it is usually shortened.

Forsage is one such MLM that has not only been established and operated entirely on the blockchain but has also achieved significant success. To understand how and why, we must first grasp the fundamentals of the MLM industry and how it operates, as well as the characteristics of blockchain technology that make it an excellent choice for powering MLM enterprises.

What exactly is a multi-level marketing company?

Laptop in which there is a world of people drawn Free Photo

Multi-level marketing, as the name indicates, is a way of promoting and selling through a network of individuals. An MLM contains layers rather than an organizational structure. A participant of the MLM scam recruits individuals to work for them, and the cycle continues.

Selling and profit are at the heart of each MLM. Anyone who sells a product or service earns a commission. However, all of the individuals in the levels above the person who made the transaction also receive commissions. As you can see, the amount of profit is determined not only by the volume of sales that a person produces but also by the number of individuals in their network.

β€œThe richest people in the world look for and build networks, everyone else looks for work.” – Robert Kiyosaki

The difficulties

Scams have traditionally plagued MLM enterprises. While it is true that some MLM firms began with malevolent intent, even genuine MLMs suffer as a result of this questionable attribution. Another reason a legitimate MLM may acquire this reputation is due of the uncertainty and inconsistencies in commission payout.

When a sales commission is given, it includes not just the individual who made the sale, but also all of the people in the tiers above them who were responsible for the recruitment of that specific member. This tracing might be difficult at times, especially when the MLM is quite vast.

Introducing The blockchain:

As you may be aware, blockchain is a decentralized digital ledger with attractive properties such as immutability, security, and transparency. Waiting at the problems that the MLM business is facing, the blockchain might be the silver bullet that the MLM industry has been looking for.

However, not every blockchain falls under this category. When it comes to customizability, Ethereum far outperforms the market leader bitcoin. TRON, one of Ethereum's derivatives, is regarded as the go-to blockchain for powering multilevel marketing enterprises.

The smart contract is what makes the entire MLM ecosystem on the blockchain efficient.A smart contract is a software that is programmed to run itself when specific criteria are satisfied. A smart contract may be used to complete transactions, provide access, and even launch high-level operations that have an influence on the whole network.

What Is Forsage?

Online world concept illustration Free Vector
Forsage is one such MLM that is entirely based on the blockchain. To begin, Forsage, like many other blockchain initiatives, relied on Ethereum. They gradually moved to TRON because it can handle more transactions per second.Forsage is essentially a smart contract-based multi-level marketing platform that operates on the TRON blockchain. The smart contract handles all elements of the MLM, including but not limited to commission payments, crypto value fluctuations, assignment of new members to particular persons on the network, and overall system security.Like every other MLM, Forsage allows members with a referral system to obtain long-term residual revenue. Multiple of three follow this reference system. Each user must recommend three individuals to the network and the cycle will continue. No boundary, pressure or goal, and in their leisure time everyone can work [or choose not to work].It is everything about Forsage and comprises the history and records of transactions. This has two opposite benefits. This brings. On the one hand, the whole project will be open to everybody and individuals may be confident that the blockchain has not modified these data anyhow.For a fee as low as 0,05 ETH you may be a member of Forsage, which is about $67. This is good since MLM enterprises were in most cases inexpensive for ordinary people and had performance pressures and objectives pre packaged.On both desktops and mobile devices, you may access Forsage. A wallet such as MetaMask must be used on your PC. You must download the mobile wallet TrustWallet on your mobile phone. Both Android and iOS provide this mobile app. You need the reference code to be properly entered so that the correct person who referred you may be assigned your membership.One of the largest sales outlets for this MLM is that it is not successful. There is no central authority, and there is no central failure. Since there is no central authority. Even if the initial members leave the network, the MLM remains functional. The MLM also offers the blockchain a profitable chance to earn money

 

Forsage Clone's significance

Forsage's performance has provided a strong argument for Blockchain reliability for MLM firms. Many crypto entrepreneurs have thus considered creating their own smart contract MLM such as Forsage.

It would be a burdensome enterprise to build an MLM on TRON or any blockchain from the beginning. You can use a Forsage Clone script as a powerful option. A Clone Script from Forsage MLM is extensively customized to carry the characteristics of your choice.

The Forsage Clone features

An admin panel and user interface should be provided for a Forsage Clone Script. The admin interface is designed to manage millions of users while simultaneously tracking user transactions in a transparent and effective way. A safe cryptocurrency pocket must be included inside the system and several matrix methods must be provided.

The user should pay quickly and securely. You should have an intuitive and user-friendly interface for all transactions. The users must be offered a chance to continuously grow income and profits through references and reports.

Safety is of utmost significance in all of these instances. The system as a whole should be decentralized and operate on an uncompromising level of transparency and anonymity with the help of smart contract agreements on blockchains such as TRON or Ethereum.

Conclusion

Now that a blockchain Smart Contract MLM like Forsage has become profitable and important, all a crypto entrepreneur has still to do is to approach a business that specializes in creating and customizing a Forsage Clone.

This requires consideration of various elements such as the company's assistance and the cost of the trans-MLM clone script. Once you've communicated the company's needs and zero down, it's a matter of time... Just a little time until you may get a suitable smart contract MLM solution like Forsage.

#forsage #mlm  #crypto #blockchain 
 

Forsage Clone: Launch A 100% Decentralized Smart Contract MLM Platform

Build and Deploy Cryptocurrency App with React and Redux

Build and Deploy a React Cryptocurrency App and Master Redux Toolkit in One Video

Learn advanced React best practices, State Management using Redux Toolkit, UI Creation using Ant Design, creating charts using Chart.js, and fetching data from multiple sources using RapidAPI while building the best Cryptocurrency App on YouTube - Cryptoverse.

Time Stamps πŸ‘‡
00:00:00 Intro
00:00:00 Layout
00:32:59 Homepage 
00:36:31 Redux Toolkit
00:53:32 Cryptocurrencies
01:11:28 Crypto News
01:32:02 Crypto Details
01:56:24 Chart
02:01:37  mobile navigation
02:06:22 Challenge

⭐ RapidAPI - https://rapidapi.com/hub?utm_source=morioh.com 
⭐ CoinRanking API - https://rapidapi.com/Coinranking/api/coinranking1?utm_source=morioh.com 
⭐ Bing News Search - https://rapidapi.com/microsoft-azure-org-microsoft-cognitive-services/api/bing-news-search1?utm_source=morioh.com 

πŸ“š Materials/References:
GitHub Code (give it a star ⭐): https://github.com/adrianhajdin/project_cryptoverse 
Styles & Other Code: https://gist.github.com/adrianhajdin/1008c664fe7896b316f5efbff8d97935 
cryptocurrency.png: https://i.ibb.co/Z11pcGG/cryptocurrency.png 
news image URL: https://www.bing.com/th?id=OVFT.mpzuVZnv8dwIMRfQGPbOPC&pid=News

#react #redux #cryptocurrency #crypto

Build and Deploy Cryptocurrency App with React and Redux
Gunjan  Khaitan

Gunjan Khaitan

1631752448

Blockchain And Cryptocurrency - Full Course

This Blockchain and Cryptocurrency course will help you understand all the basic concepts of Blockchain. We will help you understand what is Blockchain, explains the Bitcoin story, features of Blockchain which includes public distributed ledger, hash encryption, proof of work, mining and at the end you will also see a use case on how banks are using Blockchain in validating user identities. We will also cover what is a cryptocurrency, how paper money came into existence, the future of cryptocurrency, features of cryptocurrency, how cryptocurrency works, what make cryptocurrencies special, what is 'crypto' in cryptocurrency and you will also see a comparison between bitcoin, ether and Dogecoin.

Why learn Blockchain? 
Blockchain technology is the brainchild of Satoshi Nakamoto, which enables digital information to be distributed. A network of computing nodes makes up the Blockchain. Durability, robustness, success rate, transparency, incorruptibility are some of the enticing characteristics of Blockchain. By design, Blockchain is a decentralized technology which is used by a global network of the computer to manage Bitcoin transactions easily. Many new business applications will result in the usage of Blockchain such as Crowdfunding, smart contracts, supply chain auditing, etc.

#blockchain #cryptocurrency #bitcoin #eth #crypto 

Blockchain And Cryptocurrency - Full Course

How Cryptocurrency influences the eCommerce business on the whole?

Ecommerce and Cryptocurrency: Way to the future

Many big businesses are moving to digital currencies like cryptocurrencies.

It's harder to ignore the fact that these digital currencies are making a massive influence in many sectors, not leaving their trace in the eCommerce segment.

Likely it's going to have a huge picture that too, sooner than you think; yes, I'm serious.

Cryptocurrency is making huge shakes in the retail sector and certainly looks like it's here to stay.

Tesla announced that it had bought $1.5 billion worth of Bitcoin to hold on its balance sheet and is planning to allow its customers to use this coin to pay for cars. But it doesn't end there. 

So no doubt here, the rise of digital wallets is running on the highway to catch up with the trend and these wallets have become the most convenient and popular payment methods, disrupting the way people pay for their purchases.

So eCommerce retailers are now started onboarding using up digital currencies to expand their business offerings.

To get started, here's the resource for you to check on the best ever combo - Ecommerce and Cryptocurrency.

Untap the eCommerce's potential with digital currencies - because the future is certainly looking bright.

Build an eCommerce solution that scale like online marketplace platform: https://www.webnexs.com/magento-marketplace.php

Read more: https://www.klusster.com/portfolios/webnexs/contents/173175?code=34acd021-4f78-45a2-a4d1-65ca526b5427

#ecommerce #digitalcurrencies #cryptocurrency #digitalwallet #online #buyandsell #bitcoin #crypto #blockchain

How Cryptocurrency influences the eCommerce business on the whole?

Dart library for Solana

Dart library for Solana

This is the Solana library for dart using the JSON RPC API

Currently, it supports

  • Creating arbitrary transactions with an API similar to that of the Rust SDK.
  • Partial implementation of the system program. Transfer and Create Account instructions for the current version.
  • Partial implementation of the SPL token program.
  • Memo program.
  • Manually writing anchor compatible programs through a simple API.
  • Generating a keypair from a 12 word mnemonic seed.
  • Partial RPC Api implementation.

Our pub.dev package

We have the package published here if you like to use it in your project

Documentation

You can find the documentation for the existing API right here

Publishing new version

  • Use conventional commits
  • Run melos version. This will create a new commit with automatic changelog. Push the commit with the tag to the repository via PR.

Testing

To run the tests you need to install the Solana Tool Suite and start the test validator by calling

solana-test-validator

You can also create an image from Dockerfile and run it.

Next steps

Complete the RPC api and implement all methods. Implement all methods in the System program and SPL Token program.

Use this package as a library

Depend on it

Run this command:

With Dart:

 $ dart pub add solana

With Flutter:

 $ flutter pub add solana

This will add a line like this to your package's pubspec.yaml (and run an implicit dart pub get):

dependencies:
  solana: ^0.12.0

Alternatively, your editor might support dart pub get or flutter pub get. Check the docs for your editor to learn more.

Import it

Now in your Dart code, you can use:

import 'package:solana/solana.dart'; 

Download Details:

Author: cryptoplease

Source Code: https://github.com/cryptoplease/cryptoplease-dart

#crypto  #blockchain #solana  

Dart library for Solana

What Is BMBCoin BMB

What Is BMB
BMB is the core token of BMBCoin Ecosystem . It is used in governance of the protocol and in various Features

BMB is an up and coming popular method for cryptocurrency owners to gain passive income. It involves taking advantage of various incentives rewards for locking up (or staking) different cryptocurrencies. This whitepaper focuses on the BMBCoin Finance farming mechanism for the BMB token which we hope will become one of the highest performing yield farming pools
 

Official email: info@BMBCoin.org
official website: https://bmbcoin.org
White paper documentation: https://docs.bmbcoin.org

Official Channel Telegram: https://t.me/BMBCoin_channel
Official Group Telegram: https://t.me/BMBCoin_group
Official Twitter account: https://twitter.com/BMBCoin


1.3 How to Join airdrop ( BMB )

To be a Join you only need register an ETH address and hold the BMB tokens in one of the liquidity Form we will be setting up.

1.4 What About Lock Periods In Stacking Pool

Lock periods will be short durations for maximising of market activity. We will Create 120 hour lock pool, 7 day lock pool and 30 day lock pool with differing yield values for each. You will generate income from day one and you will be able to trade or sell your tokens without any limitation against all BMB/ETH Pool Pairs

Airdrop BMB

What is the Airdrop Reward?

For each user who joins airdrop BMB, 1500 BMB is awarded for each equivalent of $ 150

 

BMBCoin Information

BMB Coin Details About Contract And Token Details 
β€’ BMB Information 
β€’ Name: BMBCoin 
β€’ Symbol: BMB
β€’ Decimals:18 
β€’ Total Supply: 10,000,000,000.00 BMB 
β€’ 1 BMB = $0.1
BMB based on the Ethereum ERC20 network and Binance Smart Chain (BSC)


BMB based on the Ethereum ERC20 network

Explorer Smart contract Address: https://etherscan.io/token/0x3d9da8fe44ccf682bb1bd974bb664bef099ef813

BMBCoin: Deployer Pre sale contract Address: https://etherscan.io/address/0x0c329ff2e9e48e85b4bb24164b4225c4aec36854

BMBCoin based on the binance smart chain BSC network

Contract information BMBCoin Smart Contract
https://bscscan.com/token/0x3d9da8fe44ccf682bb1bd974bb664bef099ef813

Deployer address for Pre sale BMBCoin.
https://bscscan.com/address/0x0c329ff2e9e48e85b4bb24164b4225c4aec36854
 


 #airdrop #bitcoin #crypto #cryptocurrency #btc #bounty #ethereum #ico #blockchain #cryptocurrencies #airdrops #airdropalert #token #cryptoexchange #eth #cryptofree #ieo #tokenfree #cryptoearned #exchange #biticon #btcexchange #cryptoearning #cryptoearnings #giveaway #tokens #cryptoearn #devocapital #wa #bhfyp


 

What Is BMBCoin BMB

Daisy Matthews

1628836210

Doge1 Exchange

The #Doge1 token Welcome bounty will end on 25th August. 


@Doge1Network


Join the Doge1 Network and Win 2,50,00,000 Free Doge1 #tokens.


Join :  https://dapp.doge1.exchange/?ref=noraa


Telegram : https://t.me/Doge1Network


Read more : https://elynaezza.medium.com/doge1-token-the-doge-community-token-46901ad0963a


#dogecoin  #cryptocurrencies  #crypto #BTC  #doge  #binance  #cryptopunks

Doge1 Exchange

How to make your own SafeMoon like Coin

I am going to make a video on how to create a safe moon like transfer function where every transaction deducts a fee of 10%. Safemoon itself is quite complex in terms of its code and other things and it involves fee distribution among the holders, automatic burning and automatic liquidity pooling and stuff like that. Since the principal and logic of the funds transfer will remain the same, In this tutorial  we will transferring 5% of the transaction fee to the owner and 5% will be burn. But before we start, I want to encourage all the audience to watch the complete video before asking any questions. Because a lot of times people ask same questions again and again without even watching the video which has explained the very same thing they are asking.

ERC20.sol 

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

ERC20.sol 

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}


Links to import files: 
ERC20: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol 
SafeMath: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/f1e92dd184a599f39ce9cc4ec8a5e4a94416f3a2/contracts/utils/math/SafeMath.sol

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