With the help from HCP I could install a working (old) version of Multibit. The import of the old key (generated by an even older Multibit version) worked. I exported the key again from the freshly/newly installed (old - but still newer than "my" version) Multibit again and it looked different.
However, I hadn't tried to remove the date stamp and the import into Electrum didn't work.
Anyway, although the Multibit wallet was sooo old, it started to sync after a while and my BTC appeared. A test transfer of a tiny amount to my new Electrum wallet worked, I transferred the rest shortly after. I am very glad that it worked (and if I would have removed the timestamp I could have probably done the straight import rather then spending some transaction fees).

In a couple of days, I need to look into the fork coins. LoyceV had written a "manual" (https://bitcointalk.org/index.php?topic=2836875.0) which I will "digest" in the new year.

Thanks again to ranochigo, HCP and LoyceV for helping to recover an amount I had almost written off. Maybe a warning to "dumb users" like me who mined years back 1 or 2 bitcoins (or even more) and didn't take it seriously to adequately store the keys, wallets or update to newer wallets. 

 


Regards, CH

I google'ed my problem and came across this site: https://bitcoin.stackexchange.com/questions/66913/import-multibit-multibit-key-into-electrum.

Some blokes suggest that "Multibit had generated an invalid key due to a bug in the software". That doesn't really help me as I assume I would have to install Multibit (If I could), use the "corrupt" key and transfer the money to my Electrum wallet?!
The link I used to download the installer of Multibit: https://web.archive.org/web/20150317095524/https://multibit.org/index.html

Or is there any other way to get access?

Regards, CH

Thanks for answering so quickly! Much appreciated!



Sorry, meant to say private key


I just noticed that "Multibit.key" had/has two lines and the second is actually 52 characters long (I miscounted before, not sure why I 'missed" the first line before). The first line has 76 characters.

It looks like this (I x'ed out several characters):

U2FsXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXTMMp7aMoHkdguZZVn7CPoyrwprwtfV95  (<--- doesn't look at all like the public address "1BRiwhJ2Av1PtB5XXXXXXXXXXEufDDedjd")
5Q1NKVXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXD5dlSO

The entire code isn't accepted, nor the first or second line individually entered (screenshot with several blanked out characters below)




OK, won't try that path any further.

[/quote]

I had entered the public one which allowed me to see the old transactions (see screenshot - link above).


Question: Do these codes (two lines) look like valid personal keys? And which one - if not both - would I have to enter in which way into Electrum to extend the current "watching only" mode to a mode that allows me to access the funds to send BTC?


Regards, CH

Hi all,

I searched within this forum but all Multibit threads are quite old and didn't give me the answer I need.

I recently attempted to look into my old Multibit wallet again, which was installed on an old PC that is long gone. I am absolutely inexperienced when it comes to BTC and wallets. I used to use Multibit (well  "using" is a stretch, I provided my key to receive my millibitcoin back in 2014, that's it. I never spent any BTC).

Before I wiped the old computer, I seem to have copied the Multibit folder onto a memory stick, I also believe I must have generated/exported a "multibit.key" which was/is on the stick as well. An old transaction CSV file also shows the key which I seem to have used to receive mBTC back in 2014 (as part of short mining activity on a server in Hong Kong).

Sorry for this probably dumb question, is the public address and the personal key, in general, all I need to spend or receive BTs (plus a wallet of course)?

I installed Electrum and tried to use the key of "multibit.key" by entering it into "Sweep private keys/Enter private keys" believing that is needed to be able to fully use that wallet (spend and receive BTC).
However, the key code I found in the old "multibit.key" is not accepted (it is 53 characters long). Am I doing something wrong here?

In an attempt to install the long discontinued Multibit, I found an old installer that I attempted to use on my Win10 (64 bit) PC. It asks right away for Java, which I subsequently installed. However, after installing Java, the Multibit installer still claims no Java is installed and I am therefore unable to complete the Multibit installation.

Can someone point me in the right direction on what to do? If I can't install Multibit, what other wallets could I use accepting my key(s)?
I read somewhere that I may have to try another wallet that accepts the code/key of my old "multibit.key" and then transfer to Electrum?!?

My questions in short:

a) The key I used to receive BTC and the key within the "Multibit.key" should be in theory all I need to access/spend my BTCs (which I mined in 2014)?
b) Assuming those 2 keys is all I need, what wallet do you suggest (since Multibit is discontinued) to "migrate" using these two keys?

Thanks in advance for any help.

Regards, CH