Quote from: Lionel on August 12, 2017, 07:23:47 PM

So if you have 1548 private keys in a text file, one per each line, you can import this file with Electrum in one go.
Provided that each line has a WIF key and not other format

Is it possible with Bitcoin Core as well?

How about exporting? I want to export all of my keys in one go possibly in one file with one line per key.
Possibly WIF keys but that's not important, i may run a script that converts them to WIF

did some looking and found this:
https://bitcointalk.org/index.php?topic=886599.msg9805886#msg9805886

Quote from: deepceleron on December 11, 2014, 10:59:35 AM

If you have some text-edit finesse, you can turn a list of keys into a list of import commands. From another thread:

Quote from: deepceleron on September 28, 2014, 11:58:50 AM

Code:

"C:\Program Files\Bitcoin\daemon\bitcoind.exe" importprivkey L4mP3joYEhSv1ofdsWbz8xEmqCmYK9vGyi8mJmWWbh79Xx2NsS1M addr-1DfyaDvr-1 false
"C:\Program Files\Bitcoin\daemon\bitcoind.exe" importprivkey Ky2EGjWLhfKv1sWnPcuN4SHF2iALj6SfK7hoLWKx5T4zMqXg7aT9 addr-1DfyaDvr-2 false
"C:\Program Files\Bitcoin\daemon\bitcoind.exe" importprivkey KzrZ4DULdVWFqpF48pdJicFJfX5dqrhxBkqDnT4HRkCswdFy3Eo4 addr-1DfyaDvr-3 false
"C:\Program Files\Bitcoin\daemon\bitcoind.exe" importprivkey L2ELWXewr1PQnMwFDpfobHFqspyM6g1noM4uzkCMgoSZTSf3sQJF addr-1DfyaDvr-4 false

Just make the final line "true" to reindex.

im not sure how the actual importing would go, but seems like you can work your way through it starting with this.
really though, if youre going to import 1500 keys use a light wallet. unless you set scan to false, its going to take an absurdly long time.