# QuickSync

Source URL: https://help.blockstream.com/education/glossary/quicksync
Updated: 2026-05-26T17:14:28.000Z
Letter: Q

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QuickSync is a fast wallet synchronization feature built on the [Waterfalls](https://github.com/RCasatta/waterfalls?ref=blog.blockstream.com) protocol, an open-source descriptor-based sync protocol developed by Blockstream's Riccardo Casatta. QuickSync allows wallets to retrieve complete transaction history or unspent outputs (UTXOs) in a single API call instead of checking addresses one by one. By sharing a descriptor once, the wallet receives all relevant transaction data from the server in a single structured response, reducing sync time from hours to minutes. QuickSync offers flexible sync modes: full transaction history for complete wallet restoration, UTXO-only sync for faster transaction creation (since the wallet only needs to know what it has available to spend), and last index retrieval for finding unused addresses.   
  
Available through the [Blockstream Explorer API](https://blockstream.info/explorer-api) REST interface across all subscription tiers.

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