Welcome to Bitcoin.SE! Technically that is not part of an attack as the mempool filters are not bypassed. It is up to each node whether to accept a transaction into mempool dependant on transaction validity but also other factors which may include the fee sat/byte.
There is a part of game theory that was designed for protecting bitcoin, if some whales want to spend 10 000 satoshis per bytes spamming transactions for 1 month it is gonna cost them a lot of money, and nothing prevent someone from paying 10 001 satoshis per bytes so that its transaction is mined allowing him to dump forcing the other whales to now spam 10 ...
I'm sorry to say this is a scam. Put it in dollar terms. Someone is telling you that you've won a surprise $20,000 (not very believable in the first place). But to get it, you have to send $600 for "verification" -- what possible reason could there be for this except to enrich the scammer? They'll never send the $20,000, and you'll be out the $...
As a result of mining, miners receive income from two sources
The mining reward per block, which halves approximately every 4 years.
The transaction fees for the transactions the miner includes in the block.
The miner includes as the first transaction in the block (the "coinbase" transaction) a transaction with no inputs and with ...
I read about this in https://www.forbes.com/sites/stevenehrlich/2021/04/13/janet-yellen-bitcoin-and-crypto-fearmongers-get-pushback-from-former-cia-director/
I have categorized privacy and anonymity involved in Bitcoin transactions as (based on few cases that I have studied):
Network: Use of full node, Tor, i2p, etc.
You might be interested in my article The Bitcoin Script Language. A part of that is to go into details of the transaction format. Especially helpful is this graphic I've created:
To answer the question directly: The first one is called "marker", the second one is called "flag". BIP 144 gives more details:
Rationale for not using just a ...
Local script to find them + preprocessed data
https://bitcoin.stackexchange.com/a/5890/21282 published a local script, and https://bitcoin.stackexchange.com/a/5886/21282 published a list, but here is both together:
Scripts to find it out yourself + preprocessed data
I have uploaded scripts that extract most of the data you ask at: https://github.com/cirosantilli/bitcoin-strings-with-txids including the top 10k transactions for each category.
Those scripts rely on https://github.com/alecalve/python-bitcoin-blockchain-parser which parses the blockchain data offline and ...
The issue here is that the two transactions are different, and combinerawtransaction does not operate on different transactions (it apparently just silently does nothing). It sounds like you expect combinerawtransaction to take two separate transactions and create a new one which has the inputs and outputs of both transactions. (or perhaps take two ...
ViaBTC's Transaction Accelerator service can be used and you can pay with BTC but it will cost $100 or more.
You can wait for your transaction to be confirmed by Monday or you could have tried to spend unconfirmed UTXO if it was not cash app and some non custodial bitcoin wallet by following the below steps :
Generate a new Bitcoin address in wallet.
So it looks like your transaction does not have RBF (Replace-by-Fee) enabled, so you won't be able to bump your fee in a replacement transaction.
And there's no change output, so it seems you sent all your money in one go, so you wouldn't be able to do a CPFP (Child-Pays-for-Parent) transaction.
One suggestion is to use ViaBTC's Transaction Accelerator ...
You should first check on the transaction (tx) id generated when you sent the funds and then check it on any btc explorer (https://btc.com/) to confirm that it was sent and how many confirmations.
You should use that as a proof that your funds were sent properly.
The recipient doesn't need to have a wallet online to receive Bitcoins.
This is because the transfer of the money is recorded in the blockchain - which every full node (wallets etc) worldwide has a copy of.
Bitcoin wallets don't actually contain money. So they don't literally receive money. The only really important data in a wallet is the secret number ...
Coin selection algorithm in Electrum favours privacy so its using all the UTXOs associated with the address as explained by leevancleef. To reproduce this I followed the below steps in Electrum 4.0.9:
Send some amount to one of the addresses from coins tab.
Freeze other coins
Try to create a transaction paying amount less than both coins available for ...
Electrum used both UTXO, even if only one was needed, to protect your privacy albeit at the expense of higher fee.
This is from the Electrum source code and explain this choice:
Attempts to better preserve user privacy.
First, if any coin is spent from a user address, all coins are.
Compared to spending from other addresses to make up an amount, this reduces
In the Bitcoin.com Wallet in particular, you can go into the Settings area -> BTC Network Fee policy -> and select a fee there, either preset or a custom fee (in sat/byte).
Is there a particular minimal amount of Bitcoin one is allowed to send?
According to Paxful
Before making any transactions or depositing Bitcoin to your Paxful wallet, it is important for you to know the minimum BTC amount allowed by the blockchain network for a transaction.
Currently, the smallest amount of Bitcoin you can send or receive ...
Since the accepted answer on this question is from 2013, I think this question is ripe for an up-to-date answer :)
DarcyThomas's answer still applies, if one would assume that the island nation is completely cut off from the Bitcoin network: mining would come to a standstill since the island nation's hashrate would likely not be able to find any blocks at ...
From https://en.bitcoin.it/wiki/Protocol_documentation#Transaction_Verification we learn :
Almost all integers are encoded in little endian. Only IP or port number are encoded big endian.
You should look at the https://en.m.wikipedia.org/wiki/Endianness and flip the order of the bitstring to have the bit at the correct position
Using an online hex ...
There is no rule requiring a transaction to have a confirmation before being spent.
Yes, the mempool matters. That's also how double-spends are detected. So it's crucial nodes check the mempool and not just previous blocks.
No it does not violate the rule, they are referring to double-spends being rejected if the SAME output exists in the mempool.
Fees are way to big ... How can i send everything from one big address and pay only 20$ usd fee [the default bitcoin fee, i see on some services, 5 usd]?
To spend from a bigger amount instead of several small, you must have it. If you fragment your bitcoin holdings sending small amount (for testing purpose or any other reason) to your other addresses, then ...
Outputs with 0 value are allowed by the protocol. It is a feature that allows for provably unspendable outputs to not have to have any value that then becomes burned. However 0 value outputs are not limited to just provably unspendable outputs, so transactions like the one that you have found are possible. It is also possible to spend those 0 value outputs, ...
Now where the value is much higher and time passed it's worth to trace the coins. If scammers steal from several people then it's over time difficult not to reveal the privacy. This is because they move the coins around for obfuscation, generate change addresses and so they have to manage a lot of addresses which isn't nice.If they bring the coins together ...