When preparing a transaction in the BitBoxApp and enabling Coin Control, you will see the Send from output panel.
This panel lists all available UTXOs (Unspent Transaction Outputs) in your wallet. Each entry represents a portion of your bitcoin balance that can be spent.
The purpose of this view is to give you full transparency and control over which funds you are using in a transaction.
What information is shown in the “Send from output” panel
Each row in the panel represents one UTXO and includes the following details:
Address format
Shows the type of address where the UTXO is held:
- Wrapped SegWit
- Native SegWit (bech32)
- Taproot
BTC amount and fiat value
Displays the value of the UTXO in bitcoin and your selected fiat currency.
Creation date
Indicates when the UTXO was received. This helps you understand the history of your funds.
Address
Shows the address where the UTXO currently resides.
This can be useful if you need to prove ownership of a specific address (e.g. for message signing).
Output (Outpoint)
A unique identifier for the UTXO.
It consists of:
- the transaction ID (txid)
- the output index (a number)
“Outpoint” is the technically correct term, as it refers to a specific output of a previous transaction. In simpler terms, it can be understood as a unique reference to your funds.
Viewing more details on the blockchain
On the right side of each UTXO entry, you will see an arrow icon.
- Click the arrow icon
- The transaction opens in a blockchain explorer (mempool):
https://mempool.space/testnet/address/tb1qrk07glt9ppngdjwq6f8huxrfrunl0kuccq06wk
- Review additional details such as confirmations, inputs, and outputs
This allows you to independently verify your transaction data on the Bitcoin blockchain.
Address reuse indicator
If an address has been used more than once, the Coin Control panel may display an “Address reused” label.
Reusing addresses can reduce your privacy, as multiple transactions can be linked together.
Understanding change outputs
When you send bitcoin, your wallet may combine one or more UTXOs to reach the desired amount.
If the selected UTXOs are worth more than the amount you send, the remaining value is returned to your wallet as a change output (a new UTXO).
You can think of this like paying with cash:
If something costs $12 and you use $20, you receive $8 as change.
Important things to know about change
-
Change is not lost funds
It is automatically returned to your wallet as a new UTXO. -
A new address is used for change
Your wallet generates a fresh address for each transaction to improve privacy. -
Change addresses cannot be selected manually
They are created automatically during the transaction. -
Change affects future Coin Control
The new UTXO becomes part of your wallet and will appear in this panel for future transactions.
How to interpret what you see
The Coin Control panel helps you understand:
- Where your funds are located (which address)
- How your funds are structured (separate UTXOs)
- How old your funds are (creation date)
- How they can be selected for spending
By understanding this panel, you gain better control over your transactions and improve your privacy when using Bitcoin.
Summary
The Send from output panel in Coin Control provides a detailed breakdown of your wallet’s UTXOs.
It allows you to see exactly:
- which funds you own
- where they are stored
- how they are identified on the blockchain
This transparency is key to using Bitcoin in a more informed and privacy-conscious way.
FAQ
What is the difference between an output and an outpoint?
An output represents funds in a transaction. An outpoint is a reference to a specific output and consists of the transaction ID (txid) and an output index.
Are my funds lost when I see a change output?
No. Change is automatically returned to your wallet as a new UTXO and remains fully under your control.
Can I select the change address manually?
No. Change addresses are generated automatically by the wallet to preserve privacy and correct transaction construction.
Why are my funds split into multiple UTXOs?
Bitcoin transactions create separate outputs. Each received transaction adds a new UTXO, which is why your balance is split across multiple entries in the Coin Control panel.