Bitcoin Forum

Need help
Had problem with import private key from blockchain.info wallet to bitcoin core .
i do following thing in here https://en.bitcoin.it/wiki/Help:How_to_import_private_keys_in_Bitcoin_Core_0.7%2B
still not working ? give me notice "Null"

 ???

Bitcoin Client Software and Version Number: Bitcoin Core  0.15.1
Operating System: Windows 8.1 64-bit

What format is your PK? I am not sure how blockchain.info exports the private keys but maybe the format is not supported?

on blokchain.info show me Private Key Format : WIF its supported or not ?
any recommendation wallet ? i try using electrum but in installation show me fatal error python35.dll   ??? :-\

Where did you download Electrum?

WiF should be supported yes.

Blockchain.info is a BIP39-supprted HD wallet so I doubt it will give you a WIF key because a private key only corresponds to a particular address and a different address is used anytime you make or receive a payment.
It should give you a list of 12 or so words (called the seed/mnemonic phrase) that a wallet can interpret to generate all your used addresses.
A WIF private key is an alphanumeric string that starts with 5, K or L, eg
If your private key doesn't look like this then it's not a WIF private key.
Also, while Bitcoin Core is a HD wallet, you can't import BIP 39 seeds directly; you can only import WIF private keys so you either have to use another wallet where you can import the seed directly (eg Electrum), or get the private key of your address{es} that contain bitcoin from the seed using Ian Coleman's BIP39 tool.

If you have a "missing python35.dll" error then either your download was corrupt or your antivirus deleted the python35.dll file when the installer extracted it.
If you have an antivirus active disable it temporarily and retry.

Also, check the source where you downloaded Electrum, it should be electrum.org, and compare the signature of the downloaded file with the one on the website.

No, that is EXACTLY what it should say if the import HAS worked! ;)

That is to say, "null" means the importprivkey has completed without an error. If you goto "File -> Receiving Addresses", you should be able to see the addresses related to the private keys you imported.

You should only be concerned if you get an "ERROR" output from importprivkey

yes i download i from electrum.org i try 3 installer windows from it . standalone . installer and signature all same give error python35.dll
i try again later with all av off . its include windows defender ?



aaah i see . i can see my address there . thankyou! .
to be able see total coin in my address should wait sync time finish ?
from here notice me Estimate time left until sync " 4 weeks "  :o

edit :  Estimate time left until sync " 12 Days "  it will always decrese at the time ?

Try to update your Windows to the latest version and/or install Visual C++ Redistributable for Visual Studio 2015 (https://www.microsoft.com/download/details.aspx?id=48145).

Yes.

No... it's not your antivirus blocking anything. It is a "quirk" with the newer versions of Electrum and older versions of Windows (ie. Win 7/8). Windows 10 does not have this problem. So, as TryNinja suggested, you need to either upgrade to Win10 or try the "fix" by installing the VC++ redist, which should fix the issue...


You won't see ALL your coins, until you have synced to at least the block that your last transaction was included in.

As for the estimated time, it'll jump around a bit based on various factors... there are 3 things that affect the sync time of Bitcoin Core...

1. Internet Connection:
You're downloading 170+Gigs of blockchain... it takes a while :P

2. CPU power:
You're having to validate 170+Gigs worth of bitcoin blocks... that takes a bit of CPU processing power!

3. Storage speed:
Reading and writing 170+Gigs worth of blockchain data while storing and validating blocks requires decent storage speed. Mechanical HDD's are SLOW... SSD's are FAST...

If any of these three items is "slow", then the full sync can easily take days...


If you're in a hurry, your best bet is to try and get Electrum going... otherwise, just let Bitcoin Core sync up.

I want to add that its not recommended to import a private key from blockchain.info to a personal (desktop-) wallet.
This private key should be regarded as compromised, since it already has been in the possession of someone else (not you).

Security-wise it would be much more recommended to simply send your funds to your new core wallet.
Since the mempool is kind of empty at the moment and your TX will get confirmed within the next 1-3 blocks with a fee of 5-10 sat/B thats the best option IMO.
Additionally to the benefit of having a private key which hasn't been (and still is) owned by another company, which reduces a big risk..
you also get the chance to consolidate your UTXO's. This will make your next TX being smaller in size (and therefore cheaper to transfer when the mempool (fee) rises again)

Solved :

when strict to install Visual C++ Redistributable for Visual Studio 2015 . its giving another error
what i do :

Ty !  tryninja , HCP