Bitcoin Core will automatically create a new wallet on first start. This wallet will contain 2000 private keys (unless otherwise specified by the -keypool=<n> option) and the seed used to generate those and future keys, at least until you encrypt the wallet.
As such, there is not just one private key that you need to backup, rather you need to backup ...
Replacing an unconfirmed transaction with another one isn't really double spending, as Chytrik mentioned.
Several of the older wallets do support dropping unconfirmed txs, freeing up the inputs another transaction. In my experience, Bitcoin Core and Electrum tend to be the best candidates for such actions.
Newer, more consumer facing wallets, such as ...
Bitcoin does not work on an account model but operates on an UTXO (unspent transaction output) model. When you send bitcoins to an address, what you are essentially doing is locking those bitcoins in a mathematical equation. Spending those coins requires that you provide the correct unlocking condition (most often signature and public key associated with ...
who store the private key adresses of these seed phrases,
The private-keys are generated from the seed-phrase by a mathematical function. There is no need to store a list of seed-phrases and corresponding private-keys.
I suppose it is the wallet software provider
No, you should be the only person to know or store your seed-phrase. Ideally it should not ...
The private keys are not stored, they are deterministically generated from the seed data.
The seed encodes up to 256 bits of random entropy in a human readable form with a checksum attached to it. These details are outlined in BIP39
This entropy is then passed through the PBKDF2 hash function in order to produce a master private key and a chaining key, ...
That error message suggests that there may be a short term problem inside the systems operated by Bitcoin.io, in which case I would just retry every day or so.
Clause 5.1.2 of their user agreement says
When you create a Wallet, the Wallet software generates a cryptographic private and public key pair that you may use to send and receive any supported ...
Yes. You always have two accounts on LND (ZAP interfaces over rpc with your self hosted lnd node). One account is your lightning wallet where channel management is done, and the other is your on chain wallet. Depending on where your balance is there are different processes for moving the balance to your on chain wallet (which is what I assume you want).
Form bitcoin-abc I have found this
# Enable pruning to reduce storage requirements by deleting old blocks.
# This mode is incompatible with -txindex and -rescan.
# 0 = default (no pruning).
# 1 = allows manual pruning via RPC.
# >=550 = target to stay under in MiB.
So, the command import address should call the -rescan (in Bitcoin core yes),...
Choose a wallet program/app from a reputable list such as https://bitcoin.org/en/choose-your-wallet
Install that wallet program/app on a secure clean PC or phone (as appropriate)
Get the wallet to give you a receive address (nowadays wallets issue a different address each time)
Get your brokerage to transfer money to that address
Get them to tell you the ...
There are currently no specifications for interoperable text/file formats between lightning network node implementations. The lightning BOLT specifications deal with standardization of the network protocols so that different lightning implementations can talk to one another, but all other details which are not part of this protocol are left up to the ...
I want to transfer coins to multiple exchanges, how can I do it?
Just open accounts on all those exchanges and then get deposit addresses. Transfer funds howefver you like.
Can I split coins from one wallet into the exchanges?
Do I need a specific kind of wallet?
You can just withdraw from wherever your coins are now to your deposit addresses ...
If the above two keys are leaked, then your master private key at the account level (m/44'/60'/4') can be back-calculated. That means, any private key (both receiving and change) that you derive from that account is compromised.
To elaborate, BIP 44 uses non-hardened derivation to derive private keys after the account level. The child private key derivation ...