# importBlocks(from:) Imports blocks from on-disk block files (`blk00000.dat`-style). ``` @discardableResult func importBlocks(from filePaths: [String]) -> Bool ``` ## Parameters `filePaths` Absolute paths to block files. Empty list is a no-op that returns `true`. ## Return Value `true` if import completed successfully (or there was nothing to do); `false` if any file failed to import. ## Discussion Replays raw block files into the chainstate — typically used after copying a block directory from another node to avoid re-downloading historical blocks. This is a long-running operation; cancel via [`interrupt()`](/documentation/BitcoinKernel/Context/interrupt()).