# What is UTXO Bundling?

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UTXO Bundling lets you securely reassign the right to spend a group of UTXOs, without ever moving them on-chain. Rather than merging coins, Thunderbolt reassigns control off-chain. Using a cryptographic trick called a key tweak, users can hand over control of coins instantly, without touching the blockchain.

It’s not just batching. It’s not just compression. It’s a delegation system that preserves Bitcoin’s trust model while unlocking speed and scale.