I assume you are talking about different address types?
If so, the answer is yes.

You can derive all P2PKH, P2SH and P2WPKH types from a single private key.




Depends on whether we are talking about hardened (not dangerous; most common) or non-hardened derivation paths.
With non-hardened derivation paths, it is possible to derive the master private key by having access to a single child private key and the master public key.

But since most (all?) wallets are using hardened paths, this isn't an issue anymore.


Selling wallet.dat files? Well.. The buyer has to be stupid to do so.
Both people (buyer and seller) have access to the same seed and therefore the same private keys.






It is quite obvious that he meant 32 bytes.

Not possible.

And btw.. you don't need to mask parts of the public key.
They are called public key for a reason..

And if you did that to not reveal which public key / address you are talking about.. if a transaction has been done from that address, it is extremely easy to find out which address and public key you are talking about.
A simple scan of the blockchain is enough.

So.. either way.. masking the public key didn't help you here in any way.




Then you should maybe stop asking stupid questions about something you have been told is not possible.




If anyone is offering you help with this, he isn't a professional, but a scammer.
No sane person would claim to be able to recover the private key from a public key.

Deine Kryptowährung wird nicht on-the-fly verkauft, sondern du musst sie davor aktiv verkaufen (BTC -> EUR Top-Up der Karte durchführen).
Und hier findet deine versteuerbare Transaktion statt (angenommen < 1 Jahr Haltezeit).

Ab diesem Zeitpunkt hast du nur noch FIAT auf deiner Karte und kannst sie dementsprechend auch einfach Benutzen wie eine ganz normale Prepaid VISA Karte.


Das praktische an der App/Karte ist halt, dass du mit nur einem Klick deine BTC in € umtauschst und damit die Karte auflädst.

Alternativ lässt sich auch das FIAT Wallet in der App mittels SEPA Überweisung oder Kreditkarte (kostenlos) verwenden.
Damit überweißt du € und kannst diese dann mit deiner Karte ausgeben.

Electrum is fine. It offers quite a lot of nice features.
If you don't want to use the electrum mnemonic, you can just use another wallet to generate it and import it into electrum.

But if you are looking for another wallet, Wasabi is a nice one.




I wouldn't recommend this.
I generally wouldn't trust any javascript with crypto-related operations.

Using a desktop wallet, which uses your OS's RNG relatively directly is better than relying on javascript libraries.

Besides electrum, all reputable wallets do use BIP39.
All of these mnemonic codes are compatible with wallets supporting them.

If you are looking for compatibility within different wallets, go for a BIP39 mnemonic code (i.e. generate them not using electrum but a different software wallet).
Electrum lets you create BIP39 mnemonics too, but its easier to just use a different wallet to create it.

Soweit ich weiß, bezieht sich das auf Kalendermonate, nicht rolling 30 days.
Solltest morgen also wieder in der Lage sein, kostenlos abheben zu können.




Ja, die sind derzeit stark überlastet.
Hängt wohl mit dem Rollout in der EU und dem "baldigen" Rollout in Kanada zusammen.




Du kannst kein Backup erstellen, da es sich um ein custodial wallet handelt (Sofern du von der crypto.com App und nicht dem crypto.com Wallet sprichst).
Hier gibt es keine backup phrase.

This makes sense.
Whether this is a better or worse approach than BIP39 is questionable. But that's definitely a reasonable one.



Wow.. that's horrible.
Electrum really is doing everything which theoretically is possible..

Why doesn't it matter ?
The secret information (11 bit number; decimal: 0-2047) is used as an index to pick the correct word.

While the standard wordlist is sorted alphabetically, this doesn't have to be the case with your own wordlist. And in this case the order does indeed matter.




How would electrum be able to derive the 11 bit number from a random word without having its position in a given list ?




I was assuming that OP is talking about a custom wordlist with 2048 entries.
Anything else (e.g. using only 2 words alternating for the whole wordlist) obviously is absolutely dumb (and wouldn't work).

If you pick 2048 names of your friends, familiy, pets, etc.. the security isn't affected.

With a hardware wallet, you are buying the hardware device and the security functions it delivers.
There always is an application from the vendor available with it, but these always lack some good features.

The best way to utilize your hardware wallet and a lot of good features is to use a good wallet as an interface to communicate with your hardware wallet.

Electrum, for example, offers that option. With the desktop version, you got all the features you need and when using it as an interface for your hardware wallet, you profit from all the security features of the hardware wallet.
You shouldn't rely on the app- or software ratings when buying a hardware wallet. Better concentrate on the hardware features and what possibilities you have to use/access it.

Finding the ip address is simple, but this doesn't help you much.
However, you can simply ping it:

This works in the linux terminal and the windows command line the same way.


For information about the registry of the website, you can use whois:

Linux:

Windows:

Or you can even use a website if you don't want to use the command line at all. For example: https://whois.domaintools.com/.

You can use your own wordlist with electrum.
This will generate you a mnemonic code with 12 words from your own wordlist.

The security itself isn't worse than the standard wordlist. You just have to make sure to have the wordlist in the correct order, or otherwise you will lose access to your coins.


Is there a specific reason you want to use your own wordlist?

Don't do this.

If you are using a wallet recovery service, always only use some reputable one (e.g. Dave's recovery service).
I would not recommend to use keychainx at all.

There is no reason to store the copy of the blockchain in such a vault.
On the one hand, this copy would be outdated 10 minutes after creating it (at the moment a new block is mined and added) and additionally this is publicly available information and not secret at all.

The only thing worth storing there, are the private keys which allow you to spend your BTC.

Fände es prinzipell auch gut, wenn diese Aktion für die EU, wo die Karten ja erst in der Mitte des Aktionszeitraumes versandt wurden, um 1.5 Monate verlängert würde.
Ist aber leider nicht der Fall. 

No, you can't.

Blockchain.com is a (shitty) web wallet and does not support the use of electrum mneominc codes.
Besides that, a lot of useful features are missing.

I wouldn't recommend blockchain.com (or any other web wallet) to anyone.

Die jetzige Aktion wurde ja auch nur wegen der aktuellen Covid19 Situation ins Leben gerufen.
Sonst würde es keine 10% Cashback auf Lebensmittel / -lieferungen geben.

Ob da überhaupt noch solche "Aktionen" kommen werden, ist fraglich.
Soweit ich weiß gab es davor auch keine solcher Aktionen. Die Karte gibt es in den USA ja schon etwas länger.

If you look at the fees of the past 24 hours, they are quite low again.




A 1 sat/B transaction will be confirmed within the next few blocks.
A 2-3 sat/B transaction is almost guaranteed to be confirmed within the next block (if no sudden spike happens).




The halving already occured.
And the adjustment of the difficulty also took place on May 20.
The next adjustment will be on Thursday evening. The change will be roughly between -11% and -10%.

So even when there are a lot of transactions happening (which is definitely not sunday), fees should normalize again.

When using P2PKH with ledger live, you only get P2PKH addresses.
When using P2WPKH nested in P2SH, you only get those nested P2SH addresses.

There is no bug or similar where you get a legacy address in a nested segwit wallet in ledger live (or vice versa).


As stated in the OP:

So your proposal is highly unlikely to work and shouldn't be tried by OP without confirming that he was using a different type of address than usual.

Definitely.
Don't trust random online articles.

Quantum computers won't be a threat for the next decade.




Note that sha is not an ecryption algorithm, but a hash function.
Also, the risk with quantum computers wouldn't be AES or any other symmetric encryption algorithm, but the asymmetric ones (e.g. RSA) where the algorithm relies on mathematical problems.
The attack vector on bitcoin wouldn't be the encryption of keys on a local wallet, but the ECDSA.