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Coin Age

The length of time since a coin has last been spent. Noting how long since a number of coins have been transacted is one indication of velocity in the Bitcoin…

Coinjoin

A technique that mixes the transactions of multiple people to obfuscate which inputs belong to which outputs.

Cold Storage

Cold storage in the context of cryptocurrency refers to keeping a reserve of your coins offline. This is often a necessary security precaution, especially dealing with large amounts of cryptocurrency.…

Cold Wallet

There are different kinds of cold wallets but I’m only going to focus on the hardware variety. A hardware wallet is a physical device that is kept offline but has…

Collateral

Collateral is something which is pledged against a loan, and can be sold to repay the loan in the event of a default on the loan payments.

Collective Mining

Mining used to be a solo pursuit, with each individual trying to solve the problem presented by block and claim the blockchain reward. With the rise of ASIC chips and…

Colored Coin

A transaction can be attributed (colored) with a special meaning, such as representing a deed. This deed can then be moved around and stored like a regular Bitcoin transaction, without…

CompactSize

Original name of a variable-length integer format used in transaction and block serialization. Also known as "Satoshi's encoding". It uses 1, 3, 5 or 9 bytes to represent any 64-bit…

Confirmation

When a transaction is included in a block by a miner, it is considered to have one confirmation. Each subsequently found block adds another confirmation. Only sufficiently confirmed transactions are…

Confirmation Number

Confirmation number is a measure of probability that transaction could be rejected from the main chain. "Zero confirmations" means that transaction is unconfirmed (not in any block yet). One confirmation…

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