A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.
Bitcoin Core is a full node implementation of the Bitcoin protocol with a wallet and GUI. Bitcoin Core is a MIT-licensed Qt 5 GUI application for the original Bitcoin codebase. Additional/previous nam…
Transactions are signed messages carrying out the transfer or generation of bitcoins. They are broadcast throughout the Bitcoin network and, if accepted, integrated in the blockchain.
The journal of all confirmed Bitcoin transactions. The blockchain consists of a linked sequence of blocks and each block contains a list of transactions.—Please eponymous [blockchain.info] for the epo…
A wallet manages a user's private keys. Wallet software is used to send and receive Bitcoin. It also keeps track of the user's transactions, addresses, and balance.
bitcoind is the command-line software for Bitcoin Core. It stands for "Bitcoin Daemon" where a daemon is any computer process which runs in the background ("service" in Windows terminology).
Tells a user how to pay a recipient. Bitcoin addresses are strings consisting of numbers and letters that begin with '1', '3', or 'bc1'. Addresses encode the recipient's output script that includes ei…
Proposed payment system leveraging payment channels which allow re-negotiation of balances that finally get executed on the Bitcoin blockchain.
Transaction fees are paid to miners by the sender of a transaction. This money rewards miners for the work they do in putting transactions into a specific order and adding them to new blocks to be…
Security issues with the design or implementation of Bitcoin.
Private keys are used for signing transactions and allow the holder of the private key to spend the Bitcoin associated with the address derived from the private key.
A mining pool is a way of sharing the work needed to find a block. Miners are rewarded in proportion to the amount of computing power they contribute to the problem, with various ways of calculating r…
mining theory concerns the function, the reason for, and the underlying concepts of Bitcoin mining.
Exchanges are sites which allow for the conversion of Bitcoins to various world currencies as well as alternate cryptocurrencies.
Blockchain Ltd. is a company that offers a web wallet and provides a blockchain explorer under the domain blockchain.com.
A client is any application which allows a user to connect to the Bitcoin (or alternate) network. Alternately, "client" may refer to a non-standard user interface which interacts with the Bitcoin netw…
An API is an Application Programming Interface and services often have APIs available for developers to write software which accesses information offered by the service.
Electrum is a lightweight Bitcoin client written in Python
The components of the blockchain and a data structure that collects transactions.
A simple, stack-based, Forth-like programming language using "opcodes" to express spending conditions.
Source code and development of Bitcoin Core, the reference implementation of Bitcoin.
Segregated Witness (segwit) defines a transaction format introduced in 2017 which doesn't include signatures in the transaction identifier (txid).
Transactions that have not yet been included in a block.
Multi-signature addresses require m-of-n signatures to authorize spending funds sent to them.
BIP32, or Hierarchical Deterministic Wallets. HD wallets are wallets that can be shared amongst different wallet implementation with or without the ability to spend coins. https://github.com/bitcoi…
A public key is the public half of the public/private keypair. Anyone can use a public key check that a signature is correct, but they can't generate the signature themselves with the public key.
A hash is the output of a hash function, a function which is a mathematically reproducible but irreversible process that takes in an arbitrary length input and produces a fixed length output. The same…
should be used for questions related to the Bitcoin network and communication between different nodes on the Internet.
The process of recovering lost bitcoins or private keys from a wallet/backup
OFF-Topic: Questions about Litecoin are generally off-topic unless they are applicable to Bitcoin. Litecoin is a cryptocurrency based on Bitcoin. Litecoin is very similar to Bitcoin with a few dist…
The creation and ongoing work for different existing and future Bitcoin-related projects and source code.
A digital signature proves that the owner of a private key produced or endorsed a given message. These are used in transactions to prove that an output can be spent in a transaction.
The economics of mining operations.
Alternative cryptocurrencies are OFF-TOPIC unless the question is applicable to Bitcoin.
This is the process of bringing a Bitcoin client up to date with the list of all Bitcoin transactions known as the blockchain.
Nodes that fully verify all of the rules of Bitcoin. The most popular software implementation of full nodes is called Bitcoin Core.