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A softfork is a rule change that tightens the rules of the network. All blocks created under this new ruleset are accepted by nodes following the old ruleset, but not…

Software Wallet

Storage for crypto-currency that exists purely as software files on a computer. Creating a wallet means you have already created an address which represents your “ID”. You can use your…


Solidity is the programming language used to write smart contracts for the Ethereum blockchain. It is similar to Javascript in many ways.

Solo Mining

Solo mining means an entity is not part of a pool but instead attempts to mine full blocks itself. Due to Bitcoin’s enormous hash power and the luck involved in…

Spam Attack

The network can be spammed by creating a large number of transactions to yourself and filling up block. This raises fees and makes Bitcoin generally more expensive to use while…

Spent Output

Every transaction has at least one input and one output. If an output is also the input to another transaction it is considered spent. To calculate your Bitcoin balance, sum…

SPV – Simplified Payment Verification

Simplified Payment Verification is a way for Bitcoin wallets to confirm transaction data in a lightweight manner. It can be considered similar in some ways to Segregated Witness, which means…

Stable Coin

A Stable Coin is one that has such a low volatility that it can be used to trade against the whole cryptocurrency market, without owners worrying about wildly fluctuating values.


When a Bitcoin clock is successfully hashed, the act of hashing it becomes ‘stale’, which means that no other miner may attempt to hash it.

Stale Block

A stale block is one that has already had its data processed by a miner. Other miners will skip over stale blocks, as there is no profit in processing them.

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