Blockchain is a shared record that a network maintains without giving one machine the only copy. The useful beginner question is how a network can accept a new record and make later edits visible. That mechanism combines blocks, hashes, and…
An Ethereum account is controlled by a private key. With ethers, Wallet.createRandom() creates a new wallet from a cryptographically secure random source and exposes its checksum address. Keep the key and recovery phrase out of source control, terminals, chat, and…
How to Create an NFT in 5 Steps To create an NFT, prepare a digital asset you have the right to use, choose a blockchain and marketplace route, secure a wallet, create a collection or item, then approve minting only…
Facebook announced Libra in 2019 as a proposed global payment network built with blockchain technology. The project later became Diem, and it never launched as a public cryptocurrency. The Diem Association’s own asset-sale statement says it sold the payment-network assets…
An Infura HTTPS endpoint gives your Node.js program an Ethereum JSON-RPC connection without operating an Ethereum node, and Web3.js can confirm it by reading a chain ID and block number. What Infura and Web3.js each do Infura supplies an HTTPS…
Blockchain core components: nodes, blocks, hashes, and consensus A blockchain is a shared record that a network accepts through agreed rules. The components matter because each one answers a different question: what changed, who checked it, how the record connects…
Secure a subdomain with a free Let’s Encrypt certificate when its DNS record reaches the Nginx server that answers HTTP requests. Before you request a certificate Point an A or AAAA record for the subdomain at this server and make…
Terraform security starts with the files and identities that can change infrastructure, because a configuration can look harmless in Git while its state, plan output, provider credentials, or broad deployment role exposes more than the team intended. Protect state before…
Auth0 login for a PHP web application works best when your server uses the Authorization Code Flow through the maintained Auth0 PHP SDK. I installed the current SDK in a clean PHP 8.4 workspace and verified that its Auth0\SDK\Auth0 constructor…
Password hashing in Node.js with bcrypt means storing a slow, salted hash instead of the password itself. The async bcrypt API creates the hash during registration or a password change, then compares a login attempt against the stored hash. The…
