How Do Bitcoin Transactions Work?

Bitcoin transactions are messages that move bitcoins from senders to receivers. These transactions are signed using cryptography and sent to the entire Bitcoin network for verification. The information about each transaction is public and stored on a digital ledger called the blockchain. This ledger tracks the history of every Bitcoin transaction back to when the bitcoins were first created or "mined."

To get started with Bitcoin, you can use the multichain Bitcoin.com Wallet app, trusted by millions for sending, receiving, buying, selling, trading, and managing popular cryptocurrencies. It also allows you to connect to thousands of decentralized applications (DApps), including games and financial services.

Table of Contents

1. Overview

2. Bitcoins Exist as Records of Transactions

3. Public and Private Keys

4. Transaction Inputs and Outputs

5. Broadcasting and Confirmations

6. Why Do Some Bitcoin Transaction Confirmations Take So Long?

7. How Much Are Bitcoin Transaction Fees?

 Overview

Sending money through traditional banks involves using a bank app or website. The bank then handles everything behind the scenes. Bitcoin, however, allows you to send money without a central authority like a bank. The Bitcoin transaction process ensures transactions are legitimate, secure, and transparent.

 Creating a Transaction

When you send bitcoin, you create a transaction from your digital wallet. This includes:

Sender's Address (Public Key): The address sending the bitcoin.

Recipient's Address (Public Key): The address receiving the bitcoin.

Amount: The amount of Bitcoin to be sent.

Transaction Fee: The fee paid to miners for processing the transaction.

 Digital Signatures

To prove you own the bitcoin you want to send, you sign the transaction using your private key through a process called a digital signature. Keeping your private key secret is crucial as it acts like your digital password.

 Broadcasting and Confirmations

Once signed, the transaction is broadcasted to the Bitcoin network and enters the mempool, a waiting area for transactions to be confirmed. Miners pick transactions from the mempool to form new blocks. The first miner to solve a complex problem gets to add the next block to the blockchain. Once confirmed, the new block is added to each participant's copy of the blockchain. It's common to wait for six confirmations to ensure the transaction is final and won't be reversed.

 Bitcoins Exist as Records of Transactions

Bitcoins don't exist physically. Instead, they exist as records of transactions on the blockchain. These records show the history of all transactions between Bitcoin addresses. You can use a block explorer to see the history and current balance of any Bitcoin address.

 Public and Private Keys

To send Bitcoin, you need access to the public and private keys associated with the bitcoin you want to send:

Public Key (Bitcoin Address): Similar to an email address, it's safe to share and is used to receive bitcoin.

Private Key: Like a password, it must be kept secret and is used to authorize sending bitcoin.

 Transaction Inputs and Outputs

Transactions contain multiple inputs and outputs to allow value to be split and combined. For example, if Mark wants to send 1 BTC to Jessica, his transaction might include inputs from previous transactions he received and outputs for the amount sent to Jessica and any change returned to himself.

 Broadcasting and Confirmations

Mark's wallet software broadcasts his transaction to the Bitcoin network. Miners verify the transaction and add it to a block. The block is then added to the blockchain, and the transaction is confirmed. Each new block added increases the number of confirmations for the transaction.

 Why Do Some Bitcoin Transaction Confirmations Take So Long?

Each block has limited space, which leads to a fee market where miners prioritize transactions with higher fees. Higher fees incentivize miners to process transactions faster.

 How Much Are Bitcoin Transaction Fees?

Fees can vary from a few cents to $100, depending on network congestion and the size of your transaction. Many wallets allow users to set fees manually, enabling you to avoid overpaying or ensuring quick processing.

By following these steps and understanding the basics, you can navigate Bitcoin transactions with confidence and security.