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ScriptSig

Original name in bitcoind for a transaction input script. Typically, input scripts contain signatures to prove ownership of bitcoins sent by a previous transaction.

Relaying Transactions

Connected Bitcoin nodes relay new transactions between each other on best effort basis in order to send them to the mining nodes. Some transactions may not be relayed by all…

Reference Implementation

BitcoinQT (or bitcoind) is the most used full node implementation, so it is considered a reference for other implementations. If an alternative implementation is not compatible with BitcoinQT it may…

Hash160

SHA-256 hashed with RIPEMD-160. It is used to produce an address because it makes a smaller hash (20 bytes vs 32 bytes) than SHA-256, but still uses SHA-256 internally for…

Full Node

A node which implements all of Bitcoin protocol and does not require trusting any external service to validate transactions. It is able to download and validate the entire blockchain. All…

Deterministic Wallet

A collective term for different ways to generate a sequence of private keys and/or public keys. Deterministic wallet does not need a Key Pool. The simplest form of a deterministic…

Casascius Coins

Physical collectible coins produced by Mike Caldwell. Each coin contains a private key under a tamper-evident hologram. The name "Casascius" is formed from a phrase "call a spade a spade",…

Blockchain.info

A web service running a Bitcoin node and displaying statistics and raw data of all the transactions and blocks. It also provides a web wallet functionality with lightweight clients for…

Bitcoin-Ruby

A Bitcoin utilities library in Ruby by Julian Langschaedel. Used in production on Coinbase.com.

Bitcoind

Original implementation of Bitcoin with a command line interface. Currently a part of BitcoinQT project. "D" stands for "daemon" per UNIX tradition to name processes running in background. See also…

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