If you are running bitcoin core you can import it there. If you are importing many addresses you can import them with the following rpc call:
importprivkey [label] [rescan=true]
Adds a private key (as returned by dumpprivkey) to your wallet. This may take a while, as a rescan is done, looking for existing transactions. Optional [rescan] parameter added in 0.8.0. Note: There's no need to import public key, as in ECDSA (unlike RSA) this can be computed from private key
What you could do to speed this up is set rescan=false so that it doesn't rescan for every address.
I think you can then just restart bitcoin core to rescan all?
Or just write rescan=true on the last one. findftp, did you get this working?
Not yet.
I'm investigating several options.
I went blocktrail API method, but the API gives errors
I installed armory and it imported the keys much faster but it's currently still 'building databases' probably because I just installed it.
I read a bit about the RPC call method, but I'm not sure yet.
I did a bit of calculation and to cover all possible addresses of which one of them contain my satoshis I have to import about 400.000.000 addresses.
This probably a bit too much for a wallet.
I think I can better check each address against a UTXO database, but how to proceed?