I’m trying to understand the following two sites that display UTXO information. If I can figure out the method, that would be a bonus for this question but if I can’t can someone explain why the two sites measure UTXO differently?
The following website I think adds utxo from the gensis block: https://statoshi.info/dashboard/db/unspent-transaction-output-set?panelId=6&fullscreen
This website’s value is way higher than the one of the previous: https://charts.bitcoin.com/btc/chart/utxo-set-size#5moc
Am I missing that these are different charts? How can I reproduce them if I decide to create the charts myself?
I have several wallets from 2009 and 2010 that have not been touched since day one.I recieved 25 dollars USD worth of BTC for downloading and running a program in the background. Im guessing i was mining BTC. Didnt think another thought about it. I was alittle irritated because 25 bucks didnt just shoot outof the computer screen!! Lol.
Luckly my dad never throws away anything. So after scanning 18 hard drives ( it is a whole learning exp.)i have recovered 13 or so private kets and wallet ids. And still looking.
So obviously i am very slow to do anything and am stuck on this sweeping thing. The files may have had a list of words. I dont recall. They were not encrypted though. So are the priv. keys considered a masterkey? The only options for a standard wallet is seed or master key. One of the files did say rootsomethingor another. None were wallet.dat. i hid one file in a music folder. So where do i go from here? Also,what is xprv yprv and zprv? And what is the purpose of the console for sweeping if any at all? I am not in tye console.
Anybody have any clue how to guide me on this?
My web server:
– Generates private and public, and a wallet address from the public key for a user website account
– Server can not connect to the outside (Can not connect to the Bitcoin network)
– Has a page that allows anyone to send money to the user account wallet address
What I need to do:
– The server needs to know when bitcoins were sent to the wallet address, and how many total bitcoins are at the wallet address
Note: I have sent testnet bitcoins to that wallet.
Everything works except 1 problem: The browser user can easily change the bitcoin amounts and trick the web server into thinking more bitcoin were sent.
My question is: What methods can I use on the webserver to verify that the transaction data was not changed by the browser user. The web server has the pub/priv key of the receiving wallet. The webserver has the “bx” libbitcoin-explorer program available and I could potentially install other software.
Can I use the cammands in this diagram at all? https://github.com/libbitcoin/libbitcoin-explorer/wiki/Transaction-Commands
I was thinking to design a application which is not dependent on server and can directly send and receive data to and from other clients.I learned it is possible with UDP but how can new users join in the network and is it possible for any node to calculate active nodes .I would implement this with Socket programming using java .
So I already have the node set up on my raspberry pi. This night the transfer of the Blockchain from my laptop to the raspi’s hard disk finished. Now I am waiting for the blocks to match the headers
"blocks": 162064, "headers": 613982
The thing is that when I do
bitcoin-cli getblockchaininfo to check if it is already complete, I get this error:
error: Could not connect to the server 127.0.0.1:8332 Make sure the bitcoind server is running and that you are connecting to the correct RPC port.
I check if bitcoind is running with
systemctl status bitcoind.service and this shows up:
● bitcoind.service - Bitcoin daemon Loaded: loaded (/etc/systemd/system/bitcoind.service; enabled; vendor preset: enabled) Active: activating (auto-restart) (Result: exit-code) since Wed 2020-01-22 11:59:12 CET; 15s ago Process: 811 ExecStartPre=/bin/sh -c sleep 30 (code=exited, status=0/SUCCESS) Process: 814 ExecStart=/usr/local/bin/bitcoind -daemon -conf=/home/bitcoin/.bitcoin/bitcoin.conf -pid=/home/bitcoin/.bitcoin/bitcoind.pid (code=exited, status=0/SUCCESS) Main PID: 815 (code=exited, status=1/FAILURE)
So I try to restart the bitcoin daemon with
sudo systemctl stop bitcoind and
sudo systemctl start bitcoind. And when I check its status it shows the following (which looks good):
bitcoind.service - Bitcoin daemon Loaded: loaded (/etc/systemd/system/bitcoind.service; enabled; vendor preset: enabled) Active: active (running) since Wed 2020-01-22 12:01:01 CET; 5s ago Process: 862 ExecStartPre=/bin/sh -c sleep 30 (code=exited, status=0/SUCCESS) Process: 864 ExecStart=/usr/local/bin/bitcoind -daemon -conf=/home/bitcoin/.bitcoin/bitcoin.conf -pid=/home/bitcoin/.bitcoin/bitcoind.pid (code=exited, status=0/SUCCESS) Main PID: 865 (bitcoind) Tasks: 12 (limit: 2200) Memory: 111.0M CGroup: /system.slice/bitcoind.service └─865 /usr/local/bin/bitcoind -daemon -conf=/home/bitcoin/.bitcoin/bitcoin.conf -pid=/home/bitcoin/.bitcoin/bitcoind.pid
And when I do
bitcoin-cli getblockchaininfo again, it doesn’t show me an error, but the number of blocks synchronized is lower than before. And a few minutes later, when I go check again it all repeats itself.
What am I supposed to do here?
In an exchange website we just book trades in our database and just when user want to withdraw his BTC balance we make a real transaction in bitcoin network for him. Consider a scenario that a user deposits 2 BTC and after some trades he now owns 5 BTC. His public address balance is 2 BTC and server must send 5 BTC to user’s address. So server need to do more than one transaction: 2 BTC from his own deposit address and the rest 3 BTC from another address that server manages. In this scenario we must pay fee for at least 2 transaction. We usually in withdrawal take fee just for one transaction from user. The problem is now server must pay the other fees?
What is the solution for this problem?
In BTC scenario I want to use blockchain.com’s wallet app api. As I understood, we can have lots of publuic address corresponding to one extended public key of wallet. So we assign each user to a different public address in time of deposit. In time of withdraw, we can pay from blockchain’s wallet to withdraw address of user. Am I right about this approach?
I can generate new address of blockchain wallet with “http://localhost:3000/merchant/$guid/new_address” url. But this url just generte BTC address. How an I generate new address for ethereum and bitcoin cash in block chain.com api?
Is it possible to use such this solution for ethereum, litecoin and …
If not, how can I manage the problem of many users deposits and withdraw in an exchange site?
Excuse me for number of questions
Thank you in advance
I am little bit confused or not able to get the right Address Node Public key from Account XPUB.
What i have Done :
1==> Get the Account XPUB [78Bytes]
3==> SHA-256 Again
4==> Created Extended XPUB (XPUB + 4 Start Byte of Step 3]
5==> Base 58 ENC
7==> Account Node -> Change Node
8==> Change Node -> Address Node.
But Not able to get the right Public Address.
Please let me know if i have done something wrong ?
I have an old paper wallet with Private Keys of 58 characters (all starting with a 6). These can be imported e.g. on blockchain.com, but since I still have BSV on this key, I have to import/sweep it in ElectronCash or ElectrumSV, which doesn’t take this format.
So, does anyone know, how to convert this key into WIF (without coding if possible)? Thanks in advance!