How do crypto transactions work?
- A crypto transaction is a transfer of information securely made between blockchain addresses.
- Transactions are authorized using a unique combination of public and private keys.
- Network nodes and validators confirm transactions by organizing them into blocks to keep the network secure.
Simply put, a crypto transaction is a transfer of information made between blockchain addresses. To transfer crypto like Bitcoin, a fundamentally different infrastructure is needed from traditional payment systems. The Bitcoin network is the first infrastructure to enable peer-to-peer transfers of digital money, putting the advantages of blockchain technology and public-key cryptography into practice.
These transfers have to be signed with a private key that corresponds to its address. Signed transactions are broadcast to the network of nodes, which are active computers that follow a specific set of rules to validate transactions and blocks. Valid transactions need to be confirmed by being included in blocks through a consensus process, such as mining.
This infrastructure ensures that transactions are pseudonymous, yet transparent, and that they cannot be changed or deleted from the records once they are embedded deeply enough in the blockchain.
What are the essentials of a crypto transaction?
- A transfer made between blockchain addresses.
- A combination of a private and public key is used to sign and authorize a transaction.
- Miners or validators include transactions in data blocks by solving puzzles or following network consensus rules.
- Nodes validate transactions and blocks and keep a record of the entire blockchain.
How are transactions signed and validated?
From the point of view of a user, performing a crypto transaction is not so different from making an online bank transfer. You access your crypto wallet, fill out a form with the destination address and the amount you wish to send, and sign the transaction with your private key.
But instead of waiting for a number of banks to process your transaction, a crypto transaction is processed by a single, unified network of computers.
| Feature | Crypto transaction | Traditional bank transfer |
| Speed | Seconds to minutes | Several days (international wire transfers) |
| Processing | Unified network of computers (nodes) | Multiple centralized banks |
Once you confirm the inputs, your intention to perform a crypto transaction is broadcast to the network of nodes. Nodes store unconfirmed transactions in their memory pool and check whether these are valid, according to blockchain consensus rules.
How are transactions put into blocks?
In a blockchain, data is stored in blocks which are strung, one after another, on a continuously growing chain. Network participants take transactions from mempools (the waiting area for new transactions) to include them in a block. On networks that use a Proof-of-Work (PoW) algorithm, miners earn the right to create a new block by solving a complex mathematical problem, which gives each block its unique hash value.
Hashing (calculating the hash) protects the records from being altered. If the slightest change is made to a transaction record, the block’s hash changes significantly. Every hash is based on the hash of the previous block, which means that changing data in any block would require changing all the blocks that came after it, as well.
How does block confirmation work?
Once a block with transaction records is mined or validated and propagated across the network, full nodes validate it in accordance with the consensus rules.
When miners compete in cracking a Proof-of-Work puzzle, it can happen that two blocks are mined at approximately the same time. In such a case, nodes need to determine the right version of the blockchain. To find it, they look for the chain with the most Proof-of-Work (backed by the biggest hash rate), which is to say the chain that has the strongest support from the network.
How do network transaction fees work?
Aside from block rewards, network participants are rewarded for their work with transaction fees. Blockchain users include a small amount of crypto with each transaction for the network to collect. Everyone can set the size of the fee themselves, but it’s important to keep in mind that the larger the fee, the sooner it will be collected and processed. Information on what the appropriate fee is given the network traffic is easily available and usually automatically adjusted in most wallets, so you can avoid excessive fees.
Disclosures
Make sure to do your own research on what investments are right for you before investing or consider seeking expert financial advice. Please note that these articles are meant for information and do not constitute any financial advice. This is not an offer, recommendation, inducement or invitation to buy, sell, or hold any cryptocurrency, or to engage in any investment activity or strategy.
Cryptocurrency trading is offered through Bitstamp UK Ltd ("BSUK"), registered with the Financial Conduct Authority as a cryptoasset service provider.
Cryptocurrency held through BSUK is not covered by the Financial Services Compensation Scheme (FSCS) or the Financial Ombudsman Service (FOS).