Tag: development

A hands-on developer course that teaches how Bitcoin transactions work by building one from scratch. Start here.

How Bitcoin tracks balances using Unspent Transaction Outputs instead of accounts. The foundation of every transaction you'll build.

How to build transaction inputs by referencing UTXOs. Each input points to a coin you're about to spend.

How to build transaction outputs — defining recipients, amounts, and locking scripts. Includes P2PKH, P2WPKH, and change outputs.

How Bitcoin transaction fees work — the relationship between inputs, outputs, transaction size, and fee rates.

How to serialize a Bitcoin transaction into raw hex — version, inputs, outputs, and locktime in the correct byte order.

How Bitcoin transaction signing works — SIGHASH types, the signing digest, and ECDSA signatures that prove ownership.

How Segregated Witness restructures transactions by moving signatures into a separate witness field — fixing malleability and reducing fees.

How to broadcast a signed Bitcoin transaction to the network — from your node to the mempool and into a block.

How to verify your transaction on the blockchain, understand confirmations, and explore advanced transaction types next.