Technical Definition

Coin control

Coin control is a Bitcoin wallet feature that lets users choose which specific UTXOs will be spent in a transaction.

By Crypto University Editorial
UTXOChange outputDust

✦ Key Insight

Coin control can help with privacy management, UTXO consolidation, fee planning and keeping different sources of funds separate.

✕ Common Misconceptions

Poor coin selection can reduce privacy or create inefficient change. Beginners usually do not need to manage inputs manually.

Detailed Explanation

Wallets normally select transaction inputs automatically. Coin control exposes that selection to the user, allowing specific UTXOs to be included or excluded.

In Practice

“A user chooses one large UTXO instead of ten small UTXOs to avoid creating a larger transaction during a high-fee period.”

Dig Deeper

Address

An address is a public identifier used to specify a destination or account on a blockchain network.

Dust

Dust is a crypto amount so small that spending it may be uneconomical because transaction fees can approach or exceed its value.

sat/vB

sat/vB means satoshis per virtual byte and is a common unit for expressing the fee rate of a Bitcoin transaction.

Change output

A change output is the portion of selected UTXO value returned to the sender when the inputs exceed the amount being paid plus transaction fees.

UTXO

A UTXO is an unspent transaction output that represents a discrete amount of cryptocurrency available to be used as an input in a future transaction.