You probably won't be able to efficiently create 100 million addresses within core.

If you really want to create that much addresses (to try out your luck; maybe generating an already used address with balance? ), use a different program which is optimized to generate private-/public- keypairs.
Core definitely is not.


It might be worth to note, that you won't find an already used address (if that's what you intend to do).


Regarding the disk space required:
Basically, if you want to store the private key + the address (not within core), you'll need 256 bit (private key) + 160 bit (address) to be stored.
That's 416 bit (= 52 byte) per pair.

For 100 million pairs, thats 4GB of data.

Short answer: Impossible.


Long answer:

The keyspace is way too big to bruteforce a private key to a specific (or even 1 out of 10.000.000 random) address(es).
You'd need more energy than available on the planet to try out each possible combination.

I hope you are not relying on your analysis to be successful. It won't. Math prohibits that.

This seems weird.

You can open the last X lines by using the following command inside of the powershell (press WIN-key, then enter 'powershell'):

where FILENAME is either the filename or the full path and X is the amount of lines you want to display.

I'd say 300-400 lines should be enough.

90%+ of his posts contain a link to this low-quality news site. None of them contains further text.

It is very well imaginable that it is his site and that he's trying to get a bit of revenue from visitors.

When owning a site which doesn't provide anything special and news only being copied, you'll need to spam your link to get visitors.
Only good services/sites (which offer something special / unique) do receive visitors without begging by spamming the URL everywhere..

It's quite funny to look at your posting history. So much posts with zero substance, all contra bitcoin.

May i ask why you waste your time by posting into this forum if you believe bitcoin is 'ponzi' and 'scam' ? Isn't your time more valuable than wasting it here ?
It's not like you are achieving something with it..

I don't know why you are posting so much bullshit (maybe bought at 20k ? Or lost all of your coins because you didn't manage to write down a seed ?), but letting your anger out here is just sad.
Especially because all of your posts don't even make sense.

If you are trying to attack bitcoin.. at least use arguments with substance.



Trustless and worldwide transfer of value without a middlemen.

ASIC's (Application-specific integrated circuit's) can only perform one task. But this one task is done extremely efficiently.

You can imagine it like this:
You need to set the power at the correct pins (which basically is the input) and after the electricity has gone trough the hardware you are measuring which bits are set (output; effectively the hash).
The time it needs to calculate a hash is the time the electricity needs to run through the hardware (not exactly, but basically).

Optimization is always good (and desired). But how do you think you have achieved this optimization? Software-wise there isn't much you can do.
You would need to optimize it hardware-wise.

Services which handle a big amount of deposits (e.g. exchange) shouldn't rely on a (standard) wallet at all.

IMO, the correct way for such a (big) business which receives multiple transactions per minute would be to build the whole system from scratch.
That's the only way one can somehow 'guarantee' that it works as it is supposed to.

For small online shops with a few payments per day, using core or electrum is perfectly fine. But with several hundred / thousand transaction per day, that would be negligent.
Using a software which has not been written explicitly for this one service means that there is noone responsible for the correctness of the code, eventual vulnerabilities, bugs, etc... An absolute no-go.

What version of electrum are you using ? If you are not using 3.2.3, update it: https://electrum.org/#download.

Did you check the transaction on a block explorer (e.g. blockcypher or blockchain.com) ?
If the explorer shows that the transaction has been confirmed AND the receiving address is correct, then you have successfully received the transaction.

You can verify (if you are not 100% sure) whether your wallet holds the address by either looking in the address-tab or entering the following command into the console (View -> Show Console -> Console tab):


If it returns true AND the block explorer shows a confirmed transaction, it's just a display/network issue (maybe old version, do you have a green or red circle at the bottom right corner of electrum?).

Well, this couldn't have worked.
Simple copy/pasting only copies files 'registered' by the file system.

When files are being deleted, they are not really 'taken off the drive'. The space where they ware saved is being released instead.

Therefore you either need to (1) work on the original drive (NOT recommended!) or (2) on an image of the drive (recommended).




Keep us updated. For cloning you might want to boot a linux live distro and use dd.

The 'root key' is not compatible with other wallets.

But you can install the latest version of armory (from https://btcarmory.com/) and export the private keys of the addresses which contained BTC prior to the fork.
AFAIK, you don't need core to be synced to simply open armory and export the private keys.

The private keys can then be imported into any wallet supporting your forked coins.

Why should anyone do this ?

Instead of getting a really unfair deal, it would be way easier to simply invest 10 minutes into reading about btcrecover, to crack the password yourself.
This will get anyone 100% of the BTC inside of the own wallet, instead of only getting a percentage..

Or, if this doesn't work.. there are trustworthy(!) cracking services around (for example: https://walletrecoveryservices.com/) which charge 20%.


Any of these 2 options is better than trusting a jr. member 

You are right, i somehow missed it  Thanks for pointing out, i fixed it.



Unfortunately the chance of getting it back is relatively low, i'd say.
Even though some user have reported they successfully got their 2FA reset, the majoritiy said TrustedCoin refuses to reset it (which is reasonable because it would open a new attack vector).

This part of the book is written a bit incomprehensible.

If you specify the prune size to be N, then core won't need more than N mb to store the blockchain on your hard drive.
This phrase probably meant to emphasize, that you still need to download and verify the full blockchain (~ 180 gb). But it won't need more than N mb storage.

Depending on what you want to develop, you should make sure to index all addresses, not only the ones your wallet holds.
If you don't do this, but still need this information later, you'll have to redownload the whole blockchain again.

Another way would be to develop on the testnet. In case of something missing / needs to be redownloaded, it will be way faster (~ 14 gb to download).

The easiest way to still run a bitcoin/litecoin node there would be to use a VPN.

You can use some premium VPN access from a 3rd party (only recomended if you don't care that the VPN provider can see your traffic).

Another option would be to set up the VPN so that you connect from your eduroam-network to your home-network.
People will only see some encrypted data being sent from/to your home network, but they will not be able to determine the payload.
This option is basically free. You just need to have a computer running at home + continuous internet connection.

Of course the API is not 'compatible'.

You are talking about 2 completely different softwares. Electrum has a completely different set of methods available (which can be checked in their documentation).




The testnet blockchain is at about 14 GB currently. That's about 1 hour downloading with moderate internet speed. Should definitely be doable if you want to develop something..

Most countries don't have any 'bandwith bills' anymore. At least in my country (and all surrounding ones), you get as much download volume as you want with a moderate speed for a few dollar per month.

Also, why should your customer need to use a lot of bandwith to use your service? This doesn't make sense.


You can be sure that there won't be any 'bitcoind compatible' lightweight client 'by then'. Noone needs that. It is not being developed currently.

To restore the 2FA on your new mobile, you'll have to use the 2FA-seed given to you when setting it up (16 characters; letter and numbers).

You need one of these to be able to access your coins:

• Access to your 'second wallet' (which you obviously have) AND the 2FA code
• The original seed given to you when setting up the second wallet (which you don't have anymore)
• Master private key of your wallet (xpriv..) [2 out of 3 since it's a multisig]
• Single private keys [2 out of 3 since it's a multisig] of all addreses you have sent coins to (including change addresses)

Those are the only options. Some user (the fewest) have reported that they could successfully retrieve the 2FA code by emailing TrustedCoins (3rd party, your 2FA service provider) with the original email and asking for help.

That's quite a big one-man-project! But if you manage to create such a wallet for iOS, you'd probably can easily sell it for a few $ inside of the app store.

I believe there are quite some people who'd love to have such a fully functional wallet for their iOS device. I, personally, wouldn't mind paying a few dollars for a nice-looking fully functional mobile wallet (especially if there is no good wallet available).

IMO you'd deserve a few dollars per download.

How did you 'delete' the virus ? Did you check whether it was running in a seperate process or injected ?
Did you use some anti-malware tool to scan for malware/root-kits ? If so, which program did you use ?

Are you COMPLETELY sure that there is no other malware on your computer left ? If you aren't 100% sure, you should rather reinstall your OS before storing sensitive information (e.g. private keys) on your computer again.

I see so much scams currently. And all do follow the same scheme.

The scammer somehow sells an 'address' to someone, which then will be imported as a watch-only wallet, tricking the buyer into believing he owns the coins now.


May i ask how people get into this situation ? I mean.. HOW did you get in contact with the scammer ? And WHAT did he tell you? And why did you try to buy it this way without knowing how bitcoin works / what bitcoin is ?
How can someone believe that some public information (address) is enough to 'own' money ? I mean.. everyone can know this address, it is public.


Dear OP, please tell us WHERE and HOW you got in contact with the scammer. It won't help you, but it might help future victims.

What kind of problems ? This isn't a problem at all.

That's a design-decision. It is a trade-off between convenience and efficiency. There is no reason to check thousands of addresses if that's unnecessary for 95% of all electrum user. That's just a slow down.

If one has created 1000 addresses which received transactions, he would simply need to generate 1000 addresses again after recovering to see the correct balance.
Private-/public- keypairs are generated successively, starting with the index 0. There is no risk in losing coins or anything.