Blockchain & Cryptocurrency Glossary

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Coin Control (Wallet feature)

1 min read
Pronunciation
[koin kun-trol]
Analogy
Like choosing which specific bills to spend from your wallet to get exact change.
Definition
A wallet feature allowing users to select specific UTXOs when creating transactions, optimizing fees, privacy, and UTXO management.
Key Points Intro
Coin control enhances spending via:
Key Points

UTXO selection: Pick inputs manually.

Fee optimization: Combine or split UTXOs for lower fees.

Privacy: Avoid linking UTXOs from different sources.

Dust management: Consolidate small outputs strategically.

Example
Electrum’s coin control UI lets user choose two UTXOs of 0.1 BTC each to fund a 0.15 BTC payment, leaving one UTXO as change.
Technical Deep Dive
Wallet exposes UTXO list with amounts, confirmations, addresses. Transaction builder uses selected UTXOs, computes change and fee based on weight and fee rate. Optionally sets `subtractFeeFromOutputs` per input.
Security Warning
Manual selection errors can lead to high fees or dust creation; understand UTXO model.
Caveat
Too many small UTXOs increase transaction size and fees; consolidate when network fees low.
Related Terms
UTXO

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