My restored wallet says it will take days to rescan: how do I speed it up?
You restored your wallet from seed and the node started a rescan that looks endless: days instead of minutes.
Knowing what year you created the wallet turns a days-long rescan into minutes: the node can start from that height instead of scanning the entire blockchain history.
Why does the rescan take so long?
Without a starting point, the node assumes your wallet could have existed since the first block and scans the entire blockchain history. That can take days.
The wallet birthday concept exists precisely to avoid that start from zero: if you know what year the wallet was created, you can tell the software to start looking from that height.
How to speed up the scan using the creation year
In Bitcoin Core you can use rescanblockchain <height> to indicate the height from which you want the rescan to start. The source of this fact is: rescanblockchain <height> en Bitcoin Core; el concepto de wallet birthday.
You don't need the exact day: the year is enough for the node to skip a huge number of blocks and go from days to minutes.
What the creation year does not guarantee
The creation year only shortens the scan: it does not change which keys are derived from your seed nor guarantee that all transactions will appear.
What the creation year does not guarantee
The creation year only shortens the scan: it does not change which keys are derived from your seed nor guarantee that all transactions will appear.
Source: rescanblockchain <height> en Bitcoin Core; el concepto de wallet birthday