Bitcoin’s Blockchain Technology
Cryptocurrencies are part of a blockchain and the network required to power it. A blockchain is a distributed ledger, a shared database that stores data. Data within the blockchain is secured by encryption methods.
When a transaction takes place on the blockchain, information from the previous block is copied to a new block with the new data, encrypted, and the transaction is verified by validators—called miners—in the network. When a transaction is verified, a new block is opened, and a Bitcoin is created and given as a reward to the miner(s) who verified the data within the block—they are then free to use it, hold it, or sell it.
Bitcoin uses the SHA-256 hashing algorithm to encrypt the data stored in the blocks on the blockchain. Simply put, transaction data stored in a block is encrypted into a 256-bit hexadecimal number. That number contains all of the transaction data and information linked to the blocks before that block.
Data linked between blocks is what led to the ledger being called a blockchain.
Transactions are placed into a queue to be validated by miners within the network. Miners in the Bitcoin blockchain network all attempt to verify the same transaction simultaneously. The mining software and hardware work to solve the nonce, a four-byte number included in the block header that miners are attempting to solve.
The block header is hashed, or randomly regenerated by a miner repeatedly until it meets a target number specified by the blockchain. The block header is “solved,” and a new block is created for more transactions to be encrypted and verified.
How to Mine Bitcoin
A variety of hardware and software can be used to mine Bitcoin. When Bitcoin was first released, it was possible to mine it competitively on a personal computer; however, as it became more popular, more miners joined the network, which lowered the chances of being the one to solve the hash. You can still use your personal computer as a miner if it has newer hardware, but the chances of solving a hash individually are minuscule.
This is because you’re competing with a network of miners that generate around 220 quintillion hashes (220 exa hashes) per second. Machines, called Application Specific Integrated Circuits (ASICs), have been built specifically for mining—can generate around 255 trillion hashes per second. In contrast, a computer with the latest hardware hashes around 100 mega hashes per second (100 million).67
To successfully become a Bitcoin miner, you have several options. You can use your existing personal computer to use mining software compatible with Bitcoin and join a mining pool. Mining pools are groups of miners that combine their computational power to compete with the large ASIC mining farms.
You increase your chances of being rewarded by joining a pool, but rewards are significantly decreased because they are shared.
If you have the financial means, you could also purchase an ASIC miner. You can generally find a new one for around $20,000, but used ones are also sold by miners as they upgrade their systems. There are some significant costs such as electricity and cooling to consider if you purchase one or more ASICs.
There are several mining programs to choose from and many pools you can join. Two of the most well-known programs are CGMiner and BFGMiner. When choosing a pool, it’s important to make sure you find out how they pay out rewards, what any fees might be, and read some mining pool reviews.