What isUTXO set

The Database of Unspent Transaction Output (UTXO set) is a record of all usable bitcoins.

FAQs about the Database of Unspent Transaction Output (UTXO)

The database of Unspent Transaction Output, or UTXO set, is an important concept in the world of cryptocurrency. Here are some frequently asked questions about UTXO:

What is UTXO set?

The UTXO set is a database that contains information about all unspent bitcoins. When a transaction occurs in the Bitcoin network, some amount of bitcoin may be sent to a recipient address and the remaining balance is sent back to the sender. These leftover funds are known as unspent transaction outputs (UTXOs). The UTXO set is the complete record of all UTXOs on the Bitcoin network that have not yet been spent.

Why is the UTXO set important?

The UTXO set is important because it allows the Bitcoin network to verify that the bitcoin being spent in a transaction actually exists and has not already been spent. When a sender creates a transaction, they must include references to UTXOs as inputs to the transaction. These UTXOs are then consumed in the transaction and new UTXOs are created as outputs. The UTXO set helps ensure that these inputs and outputs are valid and that double-spending does not occur.

What information is stored in the UTXO set?

The UTXO set contains information about each UTXO on the network, including its value, the address it belongs to, and a unique identifier called the transaction ID that it was created in. This information is used to verify that the UTXO is valid when it is spent in a transaction.

How is the UTXO set maintained?

The UTXO set is maintained by each node on the Bitcoin network. When a new block is added to the blockchain, each node updates its UTXO set with the new UTXOs created in the block and removes any UTXOs that were spent in the block. This ensures that each node has an up-to-date record of all UTXOs on the network.

What is the size of the UTXO set?

The size of the UTXO set can vary over time as new transactions are added to the network. As of September 2021, the UTXO set is approximately 4.3 GB in size.


The UTXO set is an essential component of the Bitcoin network, as it helps ensure the integrity and validity of transactions. By maintaining a database of unspent transaction outputs, the network can verify that a transaction actually has the bitcoin it claims to have and prevent double-spending. Understanding the UTXO set is an important part of understanding how the Bitcoin network works.

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