What is Bitcoin?
The basics for a new user
As a new user, you can get started with Bitcoin without understanding the technical details. Once you’ve installed a Bitcoin wallet on your computer or mobile phone, it will generate your first Bitcoin address and you can create more whenever you need one.
Balances – blockchain
The blockchain is a shared public ledger on which the entire Bitcoin network relies. All confirmed transactions are included in the blockchain. It allows Bitcoin wallets to calculate their spendable balance so that new transactions can be verified thereby ensuring they’re actually owned by the spender. The integrity and the chronological order of the blockchain are enforced with cryptography.
Transactions – private keys
A transaction is a transfer of value between Bitcoin wallets that gets included in the blockchain. Bitcoin wallets keep a secret piece of data called a private key or seed, which is used to sign transactions, providing a mathematical proof that they have come from the owner of the wallet. The signature also prevents the transaction from being altered by anybody once it has been issued. All transactions are broadcast to the network and usually begin to be confirmed within 10-20 minutes, through a process called mining.
Processing – mining
Mining is a distributed consensus system that is used to confirm pending transactions by including them in the blockchain. It enforces a chronological order in the blockchain, protects the neutrality of the network, and allows different computers to agree on the state of the system. To be confirmed, transactions must be packed in a block that fits very strict cryptographic rules that will be verified by the network. These rules prevent previous blocks from being modified because doing so would invalidate all the subsequent blocks. Mining also creates the equivalent of a competitive lottery that prevents any individual from easily adding new blocks consecutively to the blockchain. In this way, no group or individuals can control what is included in the blockchain or replace parts of the blockchain to roll back their own spends.
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