Secure Infura project key: — Secure Infura project key Details: https://docs.infura.io/infura/networks/ethereum/how-to/secure-a-projectnhancv.medium.com Install lib: - For Http: yarn add web3-providers-http - For Ws: yarn add web3-providers-ws Example web3 provider configuration: https://web3js.readthedocs.io/en/v1.7.4/web3-eth.html // ==== // Http // ==== const Web3HttpProvider = require('web3-providers-http');

Details: https://docs.infura.io/infura/networks/ethereum/how-to/secure-a-project Patterns: Frontend/Mobile app: + Requests: 10/sec, 5000/day + Allowlists: Origins, Contract addresses, User agents (optional) + JWT required: Public (short expiration), Signed (long expiration) BE service: + Requests: x0/sec, x000/day + Allowlists: Contract addresses, User agents (optional) + Project secret required: JWT or API secret

Nhan Cao Nhan Cao résuménhancv.github.io https://www.credly.com/users/nhancv

Public Terraform source: GitHub - nhancv/terraform.aws.public: Web application with basic 3 tiers version. Deploy to AWS… Web application with basic 3 tiers version. Deploy to AWS using Terraform - GitHub - nhancv/terraform.aws.public: Web…github.com Best practice: https://docs.aws.amazon.com/whitepapers/latest/web-application-hosting-best-practices/an-aws-cloud-architecture-for-web-hosting.html I saw some mistakes of Full-stack developers about web hosting. To deliver better app should check some points:

STEPs S3 static website hosting bucket same domain name with direct mode Cloudfront using Origin domain of S3 website endpoint (NOT bucket name) + custom domain + custom SSL (via ACM) Route53 -> alias to CloudFront (us-east-1 only) DETAILs S3: - New empty bucket using bucket name must be equal domain name …

Getting started: https://solana.com/news/getting-started-with-solana-development Docs: https://docs.solana.com Terminology: https://docs.solana.com/terminology Wallet: https://docs.solana.com/wallet-guide — App version: https://docs.solana.com/wallet-guide/apps — Web version: https://docs.solana.com/wallet-guide/web-wallets — Extension: https://phantom.app/ — CLI: https://docs.solana.com/wallet-guide/cli Solana cluster explorers: - http://explorer.solana.com/ - http://solanabeach.io/ - https://solscan.io/…

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First, create a mintable token // SPDX-License-Identifier: MIT // @nhancv pragma solidity 0.8.4; interface IMintable { function mint(address account, uint256 amount) external; } ERC20Mintable // SPDX-License-Identifier: MIT // @nhancv pragma solidity 0.8.4; import "@openzeppelin/contracts-upgradeable/access/AccessControlUpgradeable.sol"; import "./ERC20Token.sol"; import "./interfaces/IMintable.sol"; contract ERC20Mintable is ERC20Token, IMintable, AccessControlUpgradeable { bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE"); /** * @dev Upgradable initializer…