A blockchain transaction is a signed instruction to transfer value or execute code, verified by network participants and permanently recorded on-chain. Understanding how transactions move from pending to permanent explains why blockchain works the way it does.

A blockchain transaction is a signed data record that changes the state of a distributed ledger. Understand how transactions work, what makes them different from traditional transfers, and what happens from submission to confirmation.

A blockchain transaction is a digitally signed instruction that transfers value or data between addresses. Understanding how transactions work reveals what blockchain can and can't do.

A centralized exchange (CEX) is a cryptocurrency trading platform where a single company controls custody and order matching. Understand how CEXs work as custodial intermediaries, where constraints live, and what would break the model.

A decentralized exchange (DEX) is a peer-to-peer cryptocurrency trading platform that operates without intermediaries. Understand how DEXs work, where constraints live, and what would confirm or break their viability.

USDC is a fiat-backed stablecoin issued by Circle maintaining a 1:1 peg with the US dollar through regulated reserves and monthly attestations.

USDT (Tether) is the largest stablecoin by circulation, designed to maintain a 1:1 peg with the US dollar through fiat reserves. This post explains how Tether works, where constraints live, and what would confirm or break its peg.

A cold wallet stores cryptocurrency private keys offline, completely isolated from internet-connected devices. This explanation covers how the air gap mechanism works, where security constraints live, and whether operational friction justifies the security benefits.

A hot wallet is cryptocurrency wallet software connected to the internet. The keys stay ready and accessible, which makes transactions immediate but creates an attack surface. Understand the mechanism, security tradeoffs, and when the convenience justifies the risk.

A non-custodial wallet is a cryptocurrency wallet where you control the private keys directly—no third party can access, freeze, or lose your funds. This post explains how control works, where risks live, and what's changing.

A custodial wallet is a cryptocurrency wallet where a third party controls the private keys on your behalf. Understand the mechanism, tradeoffs, and what it means for actual ownership.

A digital signature is cryptographic proof that a transaction was authorized by the private key holder—created through elliptic curve mathematics, verifiable by anyone using the public key, but impossible to forge without the private key.