Unconfirmed

After a transaction is broadcast to the Bitcoin network, it may be included in a block that is published to the network. When that happens it is said that the transaction has been mined at a depth of 1 block. With each subsequent block that is found, the number of blocks deep is increased by one. To be secure against double spending, a transaction should not be considered as confirmed until it is a certain number of blocks deep. Note that unconfirmed transactions do not expire.

Unspent Transaction Output (UTXO)

UTXO stands for Unspent Transaction (TX) Output. Every on-chain bitcoin transaction sends bitcoin to one or more addresses, from at least zero (in case of a coinbase transaction) addresses. A bitcoin wallet balance is actually the sum of the UTXOs controlled by the wallet's private keys.

UTXO

UTXO stands for Unspent Transaction (TX) Output. Every on-chain bitcoin transaction sends bitcoin to one or more addresses, from at least zero (in case of a coinbase transaction) addresses. A bitcoin wallet balance is actually the sum of the UTXOs controlled by the wallet's private keys.

UTXO Set

The UTXO set is the collection of all bitcoin addresses with unspent outputs.