I wouldn't recommend electrum for real long-term storage.
If you really plan to hold long term (meaning you don't want/need to touch these coins regularly), a cold wallet would be more suitable.
This can either be accomplished by using a hardware wallet, creating a paper wallet or using an offline PC for storage only.

Electrum is only as secure as your whole setup (your OS, installed software; PC in general) is.


I also wouldn't call blockchain.info a 'safe' online wallet.
There is no real reason to think that it is anyway better than one of the other web wallets. Web wallets are generally way less secured than mobile-/desktop- wallets.

Wait.. what?


A password is something you know which gives you access to something (either bei autorization or encryption/decryption).

A 'private key feature' does not exist. A private key is a big (random) number which has a mathematical relation to the public key.
In bitcoin, the private key allows to spend UTXO associated to the correlating public key.

An email is nowhere used inside the bitcoin network. Online sites/services require you to use an email to register.
But when losing a password for a wallet (we are not talking about a 'web wallet' like blockchain.info or a wannabe-web-wallet like coinbase) there is no option to reset it via email..


It seems you have quite a big misunderstanding about how the whole system works. I hope you have your coins well secured, and know what you are doing 

It is still not completely clear what you mean 

I did understand the following:

• You entered your seed and are able to access your wallet
• You can see your old transactions
• 'Newer' transactions are missing (only BTC and ETH?)

Is this correct?
Do you also have other coins/transactions (besides BTC/ETH) on your trezor which you can see when opening your wallet (either completely or partially) ?

HCP's suggestions seems to be the most promising one. Do you remember whether you have once added 'another account' inside your wallet?


Since you can access a part of your transaction history your seed most probably is correct (except for the case where you have changed it; do you only see old transactions inside your wallet (without a current balance) or is there actually a balance ?)
Do you remember creating a new seed ?

This is a quite funny statement.

I'd be interested to hear why you think that a hardware wallet (private keys generated + stored in an 'airgapped' offline environment, requires to physically press a button to approve transactions, can be run on an infected PC) has the same level of security as 'alternative clients'.

Desktop-/Mobile-/Web- wallets store your private keys on a device which is connected to the internet.
Desktop-/Mobile-/Web- wallets do NOT need a physical confirmation to send funds.
Desktop-/Mobile-/Web- wallets can NOT run on an infected PC without getting compromised.

The same applies if someone was to send me some venezuelan dollars.
They are worthless here. I wouldn't be able to convert them because the flat fee would be higher than yearly wages in venezuela.

If i am insisting on only accepting one currency, sure. I will have to convert it and need to pay a fee.

But if i am somehow free of which currency i choose, i won't have to exchange it. And in this case (i guess thats what bitcoin aims for ?) BTC is definitely the better alternative (imo).
There would be no reason for me to exchange BTC if i can pay bills, rent and food with BTC (and i definitely wouldn't).

To check whether your wallet does hold the private key to the address, enter the following command into the console ('View' -> 'Show Console' -> 'Console'-tab):

This will return true or false

To export the private key, enter:

Actually every (proper) wallet does that.
They check each address one-by-one (increasing a 'counter' when deriving keys) and stop when they have found X addresses without a transactions (X = address gap limit; can be set in settings).



Of course.
You can always do it yourself. And you can always use a wallet to do it for you (electrum does that pretty nicely, gap limit can be adjusted easily and consecutive checking for balances works flawlessely).


You won't have any disadvantage when using a new address for each customer/order. In fact you will keep the privacy of your customers and you will somehow 'hide' the total amount of money/transactions you received.

But unfortunately this won't allow the QR code to be scanned with a mobile wallet app (like it is mostly done when paying via scanning QR codes).
This is quite a disadvantage regarding usability (imo).

For business cards, this probably is the cleanest solution. But for a restaurant with a QR code (at the door/windows, or wherever), i'd rather choose a screen displaying the QR code (which changes it after reach TX).

Weird.. i am certainly sure that this hasn't worked when i tried it..
Unfortunately this command doesn't appear in the list of commands (help()).


I guess this was my mistake  

The reason is quite simple.
Armory does not rely on an online service to verify transactions. It verifies the transactions itself (and therefore the full blockchain has to be downloaded and stored).

If you don't want to download the whole blockchain, you can always switch to a lightweight client (e.g. electrum). These lightweight clients query an API to retrieve information about your balance/addresses.

So, you are talking about this (second) sentence:



Then you obviously didn't read my first reply, because i have quoted exactly this sentence..



I am sorry that you lost coins using jaxx, but users have been warned quite often since jaxx is known to be vulnerable (and buggy).
And i am also sorry to tell you that your coins havn't been stolen by jaxx developers.

It is a fact that the majority (i am talking about 70%+) of the users in the crypto space do not have a clue how to protect a wallet properly.
And unfortunately you seem to be one of them.

I know that the easiest way is to blame others, but unfortunately you are the only one who is responsible for the security of your coins.
Obviously, your setup wasn't as secure as you thought it was.

Take it as a lecture and try to understand what your mistake was. Try to learn from it instead of blaming others.

You can't 'program bitcoin'.

But there are definitely quite a few things you have to care about when programming anything which handles sensitive information (in this case: private keys).
What exactly you have to care about depends on what kind of software you are writing.

If you are planning on creating an online service you'll need way more security precautions than when coding a small scrip which querys an API / your node.

So, if you want some advises on what to keep in mind when programming, the best would be to create a new thread describing what your plan is, so people can think of attack vectors / possible bugs.

No. This does not work. Typos are evil.

This command worked in older versions of electrum.
The current command to create an address in electrum is createnewaddress().

There is no way to actually create a change address via the command line (afaik). createnewaddress doesn't take any parameters.

Just because an attacker gained access to your exchange-accounts and one of your addresses, he still wouldn't be able to get the private key out of your jaxx wallet.
Those online services (accounts hacked or not) are not related to the theft of your coins (private keys) from your desktop wallet.

The only option is that your system is infected (assuming you did create a new seed in jaxx and didn't use an old seed which is accessible anywhere else).

An exchange account and your address can under no circumstances lead to your private key (stored locally on your PC) to be accessed.


So, either someone had physical access to your computer, your computer is infected or you have stored your seed somewhere not safe (e.g. anywhere online).

Well, in ledgers case with the nano s, the entropy comes from an AIS-31 certified TRNG.
At some point you have to trust someone. France and germany both have official documents which describe the methodology of TRNG certified under AIS-31.
Federal IT-related agencies trust that way to generate random numbers.

Even if you do not trust anyone, you are still free to create your own (mnemonic) seed and import it into your hardware wallet, but the chances are very high you end up with a lower entropy.


[1] https://www.ssi.gouv.fr/archive/site_documents/certification/NOTE-05_Evaluation_AIS31_en.pdf
[2] https://www.bsi.bund.de/SharedDocs/Downloads/DE/BSI/Zertifizierung/Interpretationen/AIS_31_Functionality_classes_for_random_number_generators_e.pdf?__blob=publicationFile

AFAIK electrum unfortunately does only allow to create new 'receiving' addresses via the console, but no change addresses.

In order to derive more change addresses from your seed, you will have to use another wallet/tool to derive them.

Since electrum does not use BIP39, you will have to export the master private key of your wallet.
To do this, you will have to open the console ('View' -> 'Show Console' -> 'Console'-tab). Then enter this command:


This will print you out your mpk (will start with xprv..).

Afterwards either import it into another wallet (using the derivation path: m/44'/0'/1'/, for receiving-addresses: m/44'/0'/0'/ ) or download this site (https://iancoleman.io/bip39/) and run it on an offline PC to generate the private keys of your addresses (which you afterwards can import into another wallet).

Actually there are quite a lot exchanges who are trustworty.

For a Fiat->Bitcoin gateway (no ordering):

• Coinbase (https://www.coinbase.com/)
• Kraken (https://www.kraken.com/)
• Bitstamp (https://www.bitstamp.net/)
• Gemini (https://gemini.com/)
• Localbitcoins (Peer to Peer exchange, not a 'full exchange'; https://localbitcoins.net/)

Crypto <-> Crypto exchanges (no ordering):

• Binance (https://www.binance.com/)
• Kucoin (https://www.kucoin.com/#/)
• Bittrex (https://bittrex.com/)
• Bitfinex (https://www.bitfinex.com/)

These are the most commonly named/used.
While they are trustworthy enough to buy/sell coins on them, they are NOT trustworthy enough to keep the coins on the exchange (this applies to every(!) exchange).


If you are going to buy bitcoin (or any other crypto) make sure you already have learned/understood how to store coins safe.
Create a wallet -> buy your coins -> withdraw them immediately.

Vyper shouldn't be considered a real programming language.
Vyper is a new smart contract development language. Python, on the other hand, is an (interpreted) scripting language.


The basic differences are:

• Vyper:
  Is used to code smart contracts on the ethereum network (only)
  You can read more about vyper here: https://github.com/ethereum/vyper
  
  
• Python:
  Is used to code any script to be run on any OS in any context (as long the python module is installed)
  You can use it for any automated task you want to be accomplished (e.g. simple I/O operations, API querys, basic or advanced bots, even object oriented (with quite a bad runtime), etc.. )
  If you want to learn more about python, visit https://wiki.python.org/moin/BeginnersGuide/Overview

You might want to move this topic into the Mining section. You probably will get more qualified answers there.

Reflashing the firmware in order to gain access to the API sounds very strange.

Unfortunately i am not very familiar with the antminer config, but you might try setting "api-allow" : "A:0/0,W:*".
Did you follow this guide to set up the privileged API access ?

1) You didn't refute anything.
2) It is not a 1MB limit, it is a 4.000.000 Weight limit.
3) The only 'mathematical techniques' you have used were simple percentage calculations..




You didn't prove anything. All you did was to express your opinion.




What about the most obvious one:


Still not a single argument pro on-chain scaling.