In addition to this:



Make also sure to use an USB data cable. Not just a power cable (often delivered with mobile phones, etc..). Those do have the power pins, but the pins for data transfer are missing.
Usually the cable provided by ledger itself works the best.

OP, can you confirm you are using the up-to-date version of electrum (3.1.3)?
Older versions do not sync properly (and therefore don't allow to send transactions properly).

What does your electrum balance show? Does it show the reduced amount (after sending tx) or does it show the 'whole' amount ?

You can't 'find' your RPC username and password, you have to set one first.

In the console (to set port, username and password):

Then start the daemon and load your wallet file:

Links to each site (for easier access):

• Onchainfx: https://onchainfx.com/
• Coinloop: https://coinloop.io/
• Spirai: https://spir.ai/
• Cryptowatch: https://cryptowat.ch/

CMC seems to do quite some shady stuff.
I, for my part, already have stopped using CMC completely due to the accusations and wrong and incomplet price/supply information.

A Javascript bitcoin libary can be found here: https://github.com/bitcoinjs/bitcoinjs-lib.

An bitcoin core RPC client can be found here on NPM.


Both are the first results on google.
Quite a lot of repositories, code snippets, libaries, .. can be found pretty fast using google.

The speed of a live usb system is always capped by the transfer speed you have with USB. This is not a 'problem' directly attached to Tails.
This applies to any live OS. USB 3.0 is (kind of) always required to have a smooth (and properly operable) system.

'The crypto module provides cryptographic functionality that includes a set of wrappers for OpenSSL's hash, HMAC, cipher, decipher, sign, and verify functions'.

Further, 'SPKAC is a Certificate Signing Request mechanism originally implemented by Netscape and was specified formally as part of HTML5's keygen element'.


Everything is explained in the link you have posted.
This is not related to cryptocurrencies. It is used for cryptographical functions (requesting, signing, verifying, ... signatures/authentication codes/etc.. ).

Installing the correct version of the wallet (desktop application + nano s application)  most probably will solve your issue.
But make sure your nano s is up-to-date as well!

Current firmware version is 1.4.2 (https://www.ledger.fr/2018/04/17/announcing-ledger-firmware-1-4-2/).
At least 1.3.1 is required to be able to run the ripple wallet.

Please at least use correct statements when trolling this forum.

Secp256k1 refers to the parameters used in the ECDSA (Elliptic Curve Digital Signature Algorithm).


Signature algorithm: https://en.wikipedia.org/wiki/Digital_Signature_Algorithm

Encryption: https://en.wikipedia.org/wiki/Encryption


Please read those two links and learn the difference between encryption and signature.
I highly doubt you are capable of developing anything..

The question is wether "Be your own bank" still applies here if you let a bank be your bank instead of being the bank yourself.

Those boxes do not guarantee availability at any given moment.
This may be more secured (from stealing attempts) than storing private keys under your pillow, but is not a reliable (in terms of availability, access, etc.. ) long-term storage.

Those boxes can still be seized by the government.

The longest valid chain is the actual blockchain.




Bcash does follow different consenus rules. They hardforked to a bigger block size.
The bcash chain is longer because the difficulty is (and was) way lower while some miner were starting to mine on the bcash chain.
Bcash blocks are not valid for the bitcoin chain.

 


No, longest valid (meeting all consens rules) chain.




No. https://bitcoin.stackexchange.com/questions/5859/what-are-orphaned-and-stale-blocks

SPKAC stands for Signed Public Key and Challenge.

- Wikipedia


Where did you read it in the context with crypto (cryptocurrency? or cryptography?) ?
I am not aware of any blockchain project somehow utilizing SPKAC.
This is something completely different (if you are comparing it with signature algorithms, etc.. in crypto(currencies)).

Each hardware wallet needs mechanical confirmation (pressing buttons).
If it didn't have one it wouldn't be a second factor authentication at all.
Trezor and Ledger do not differ much in this point.

Currently you can condider both (ledger and trezor) wallets as secured. It is personal preference which one wants to choose.

The Nano s from ledger does not have any bugs.
The previously found 'vulnerabilities' did not lead to any theft.
Each software has bugs. It is just a question wether they have been found yet.

If you think trezor is 100% secure i have to disappoint you. You can't have 100% security. 
The goal should be to minimize the risk as much as possible through appropriate measurements and common sense.

Tails is a good option for a private distro just for crypto stuff.
But be careful with the built-in wallet. It took several months for them to update the wallet to the most updated version (this version of electrum was vulnerable to exploits).

Any clean OS should be fine (with linux kernel in a slight advantage here).

But instead of running it via live usb, you might want to install it on a dedicated device (medium size USB stick / usb 3.0 hard drive) to keep updates installed ("buffer between startups" option when installing on USB).
You don't want to update/download everything each time you plug your USB in.

When dumping multiple private keys this command might be better:


This command does dump all private keys into a .txt file.
But note that the private keys will be saved in this .txt file in plain text. Never execute this command on an (eventually) compromised computer.

The problem here is that a lot of vendors don't publish proper updates.
Researchers have found out that many vendors didn't patch the firmware. Software/firmware has been updated but in reality a lot of vital patches were missing.


Source: https://www.wired.com/story/android-phones-hide-missed-security-updates-from-you/

Probably because he wants to make sure to never use your exchange.
Without offending you, but if you have to ask such basic questions i highly suspect your 'exchange' will be vulnerable to any kind of attacks.

DannyHamilton is one of the nice guys who ask you this question to never use your exchange.
But there are also another kind of people.. those who will definetely make use of your weak exchange to get a quick buck.

If you really want to open an exchange, i'd suggest you hire a professional team.

This basically depends on the amount of coins you want to store and the grade of security you want to reach.

The best option would be to use a hardware wallet (for regular spending) or a paper wallet (if you are holding for years, without accessing them).
If you don't want to spend money (or if the amount you hold is not worth it to get a hardware wallet), i would suggest to use a desktop wallet (e.g. electrum with a good password).
I personally would not use a online wallet. Only if you really need to access it from different locations without bringing 'devices' with yourself.

Online wallets shouldn't be regarded as safe. Neither should they be used for 'larger' amounts.

But if you insist on using an online wallet, coinbase and blockchain.info seem to be the most commonly used.
Blockchain.info claims that they never gain access to your private keys. The wallet file is being encrypted locally and uploaded to the blockchain.info server.

But keep in mind that the whole security consists of 1) the security of your password and 2) the security of the server.