CREATE2 is an Ethereum opcode that lets you calculate a smart contract’s address before you deploy it. The address comes from a formula, not from the deployer’s transaction count, so you can know exactly where a contract will live —…
A flash loan lets you borrow money with no collateral, as long as you pay it back inside the same blockchain transaction. If you can’t repay the loan plus a small fee before that transaction ends, the whole thing is…
Gzip compression shrinks the JSON that a blockchain endpoint sends back to your application, so large responses download faster and burn less bandwidth. You enable it by telling the endpoint your client accepts gzip — and with most modern tooling,…
Every Ethereum transaction that touches a smart contract carries a block of hexadecimal data. That block is the calldata, and it tells the contract which function to run and what arguments to pass. On its own it looks like a…
A replay attack takes a transaction that was already signed and valid in one place, and rebroadcasts it somewhere it was never meant to run. The signature is real, so the receiving network accepts it — even though the owner…
You stream pending transactions by opening a WebSocket subscription to newPendingTransactions, then resolving each hash the socket pushes into a full transaction object. You filter that stream in one of two places: in your own code after decoding each transaction,…
The best Polkadot wallet for most people is Nova Wallet on mobile or Talisman on desktop, paired with a Ledger device if you hold a large amount of DOT. That short answer covers the majority of use cases. The longer…
To integrate Solana into a Web3 project, you point your application at a node connection and send it JSON-RPC calls. Reads like account balances, writes like signed transactions, block lookups — all of it travels over that one connection. You…
Cardano does not behave like an EVM chain, so the integration playbook you know from Ethereum only gets you part of the way. There is no eth_getBalance, no account that simply holds a balance, and tokens are not ERC-20 contracts.…
A validator node is a computer that stakes cryptocurrency to check transactions, confirm new blocks, and keep a Proof-of-Stake blockchain running honestly. It does the job miners do on older networks, but instead of burning electricity to earn the right…