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5 views

How can a reciever verify that transaction data was not altered by 3rd party?

My scenario: 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 ...
0
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0answers
3 views

How can I do CDataStream to String to CDataStream conversion?

I'm developing a bitcoin application which saves Block to a file from which it can be read at later point of time. So I'm converting CDataStream vRecv to hex string using below bitcoin defined ...
2
votes
1answer
14 views

Bitcoin Difficulty granularity

Difficulty adjusts by very granular percentages to target for 10 minutes blocks. But adding another zero at the end of the chain of zeroes from the header hash requirement for a valid block would ...
0
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0answers
17 views

How do I build a blockchain/cryptocurrency that uses 4-8 bit encryption instead of 256 [closed]

I'm essentially trying to build a cryptocurrency in python with the same scheme as bitcoin or something else except instead of encrypting the information such as ledger information in a 256 bit SHA ...
-1
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2answers
34 views

DOUBLE SPENDING PROBLEM IN BITCOIN

Suppose Alice sent 2 bitcoins to Bob, Bob ships the product to Alice, then Alice sends 2 bitcoins to herself. Why is this a problem ? If both the transactions are approved then also Bob gets his 2 ...
0
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1answer
14 views

Transfer of BTC the wallet address p2pkh to wallet address p2sh

Is it possible to send BTC from wallet having address type p2pkh to the receiver wallet address p2psh
-4
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0answers
30 views

hOW DO i GENIRATEAN AN API? [closed]

I SENT BITCOIN CASH FROM MY COINBASE ACCT TO EMPIRE WITH THE BITCOIN ADRESS GENERATED TO ME FROM EMPIRE MARKETPLACE. IT SAID IT WENT THROUGH BUT IT DIDNT IT WAS REDIRECTED TO BLOCKCHAIR WHERE I DONT ...
1
vote
1answer
41 views

What is the length of largest known reorganization in bitcoin?

Usually there is an assumption, that a transaction is fully finalized after 6 confirmations, e.g. 6 blocks mined on top of the block, which includes given transaction. What is the length of largest ...
0
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1answer
30 views

Bitcoin core doesn’t see transaction

I’ve created address in bitcoin core from rpc and send some bitcoins on it, but my balance still zero. Transaction exists I’ve checked on blockchain info. Getaddressinfo returns “ismine”: true, but ...
1
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0answers
16 views

Is there a way to test Blockchain.info APIs? [closed]

I'm trying to set up Blockchain.info web APIs to notify me when I receive a BTC payment: https://www.blockchain.com/api/api_receive So say, if I generate a receiving address as such: https://api....
0
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0answers
26 views

P2MS transaction

I'm studying Bitcoin's Protocol and I want to replicate P2MS in regtest. Yes I know that I can use P2SH but I'd like to understand it more in depth. I Have 3 addresses P2PKH (A and B and C). A has 50 ...
1
vote
1answer
17 views

How does bitcore-node get its data?

I'm trying to understand how does bitcore-node, the javascript implementation of Bitcoin protocol, get its data? Can it connect to Bitcoin Core, the original C++ implementation of the Bitcoin protocol,...
0
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2answers
30 views

How to parse transaction script to address the correct way?

i am currently parsing blockchain transaction data from the raw hex blk00000.dat files downloaded by Bitcoin core. In order to validate, i compare my results with blockchain.info from time to time. ...
1
vote
0answers
23 views

Not receiving Compact Block even after 'sendcompact' message

I have setup a regtest net locally with 2 nodes. One of nodes generates blocks using 'bitcoin-cli generatetoaddress 10 ', sendcompact message was sent from other node yet it gets normal block(...
0
votes
1answer
26 views

How do i print bitcoin transactions from a mining pool in php

i would like to print out bitcoin transactions from a specific bitcoin mining pool not just a bitcoin address using php and a blockchain api or any other api here's all i have <?php $address = "...
0
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0answers
21 views

Can anyone issue USD on the Ripple ledger? [closed]

I'm reading through some of the documentation for Ripple and came across the following: Each trust line is specific to a given currency code. and In a sense, rippling is like a two-way ...
0
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0answers
19 views

How do the new KYC rules for Deribit apply to VPN users in the US? [closed]

I was just wondering what the new KYC rules enforced in Feb 2020 will effect VPN users in the US.
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0answers
7 views

How to compute minutely premium index for XBTUSD on Bitmex? [closed]

I am trying to compute the minutely premium index at 2020-01-23 17:24 UTC for XBTUSD on Bitmex. At this time, Mark Price = 8330.53, Impact Bid Price = 8339.5, Impact Ask Price = 8340.2836, Spot Price ...
3
votes
2answers
251 views

A security need for Bitcoin to fork to quantum resistant algorithm in a few years?

in just a few years I believe that quantums will exist that break asymmetric ciphers, and bitcoin is based on asymmetric ones like public-key-cryptography, correct? Symmetric algorithms are supposed ...
0
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0answers
11 views

Altcoin Transaction stuck in Mempool [closed]

I have a forked coin from litecoin source , the current nodes are running on codebase 0.8 of litecoin (which i know is old) , i am upgrading it to a newer 0.13.2 version codebase , while testing ...
0
votes
1answer
30 views

How can Server-less communication take place between clients?

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 ...
0
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1answer
33 views

Mining pools communicating outside of network

Does anyone know of any papers / evidence of bitcoin mining pools communicating outside of the bitcoin network for financial gain? It seems plausible in practice, but I am not sure if that has ...
0
votes
1answer
43 views

Is it possible to mine using Asics on AWS?

As title says, I would like to know if mining with asics on aws is possible and how to do it? I don't mean profit because I don't really care and only do it for fun. Thanks!
0
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2answers
48 views

How can I know which user made which BTC transaction?

I am making an app, and I want my users to deposit BTC coin to my address which is an exchange address (I don't have the private keys). How can I know which user made which transaction? I have a way,...
0
votes
1answer
39 views

How do miners communicate in Bitcoin/ Decentralized Network?

1.)If there is no central authority maintaining database how miners differentiate among other miners. 2.)Do they have there own database which have details(Mac/IP address) of neighbouring miners . 3....
0
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1answer
30 views

Error while syncing with the blockchain on my Raspberry Pi

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 "...
0
votes
1answer
33 views

How to transfer amount to wallet [closed]

My friend has a bitcoin on tradebrite.net/ website and the website is not launching or opening the page. how can he transfer his bitcoin to some working website or wallet.
1
vote
1answer
28 views

If I am on a fork, can the reindex parameter fix this?

I've been reading confusing information online about what the --reindex startup parameter does. This link is not clear to me. https://github.com/bitcoin/bitcoin/blob/...
0
votes
1answer
23 views

How Bitcoin Core calculate extended private masterkey from hdseed

I am testing a Bitcoin application, and to test the signing of transactions I use regtest with Bitcoin Core. But I have some problems, the first I have already published in a question that I still ...
0
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0answers
14 views

Mining a private peercoin fork [closed]

I am trying to start a local test blockchain fork of peercoin. I have updated the genesis and network parameters, mined the new genesis hash and have successfully started and connected two nodes to ...
0
votes
1answer
47 views

Signmessagewithprivkey result is different than txinwitness

I'm studying segwit and I'm doing some experiment in regtest. I create a raw transaction with P2SH address. My Transaction data without signature is: ...
-1
votes
1answer
32 views

If i download the 160GB downloading , i will be global node?

i have a question , i've searched a lot but no answers i get i've installed bitcoin core and after opening the app , it is downloading about 160GB and its gonna take two weeks to be completed my ...
1
vote
1answer
36 views

How to reduce number of inputs in bitcoin transaction?

We have a bitcoin node running on a server which we use to generate addresses to receive small payments from the users. We receive tons of small payments daily right now and then we are using the same ...
4
votes
1answer
178 views

How many possible addresses per bitcoin private key?

Based on my research every bitcoin private key (compressed or uncompressed) can have 4 different addresses: P2PKH compressed and starts with 1 P2PKH uncompressed and starts with 1 P2SH and starts ...
0
votes
1answer
20 views

Is it possible to reference an input outpoint more than once in a transaction?

For example, could you have the following transaction: A --> B A --> C Where A is an input txid and index, and B and C are outputs? The reason I'm asking is because I believe with SIGHASH_SINGLE ...
1
vote
1answer
131 views

Paper wallet safety

I'm using the mobile "trust wallet" app, and my plan is (was?) to write down the mnemonic key and keep it in a safe place, then delete the app. Then whenever I need to receive or send money to a ...
1
vote
1answer
31 views

Does bitcoind ERROR “Disk space is too low!” refer to RAM or actual harddrive?

After having finished the "Initial Block Download" I needed to reindex: [BTC_Core_Expmnt]# bitcoind -reindex -datadir=/mnt/BTC_Core_Expmnt The debug.log showed everything starting up ok; and the ...
2
votes
1answer
28 views

how check bitcoind default values

How can I see which values bitcoind is using for eg. dbcache, or other memory and connection params ? If the value is NOT set in bitcoin.conf. Is there a bitcoin-cli command to check all the params ?
0
votes
1answer
23 views

Withdraw and deposit in cryptocurrency exchange website

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 ...
0
votes
0answers
29 views

How does HASHSIG work?

I am reading an article about how HASHSIG works, but i don't understand this: Before the signature is computed, several temporary changes are made to the transaction: The signature script of the ...
0
votes
1answer
23 views

bitcoin-qt importaddress not working

using bitcoin-qt 0.19.0.1 on mac, I type this in console: importaddress someaddress "" false After I hit enter, the output is "null". What's wrong ?
-1
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0answers
20 views

Bitcoin network/solo [closed]

Let's say I'm in idiot was mining back in 2009 2010 I'm shure I moved 70 million in bitcoin about a year ago I got every wanna be hacker trying to or already have got all my info but to top it off ...
0
votes
0answers
20 views

Why stratum's data previous hash has that specific byte ordering?

I am doing some tests to understand the stratum protocol. If I connect to a stratum pool (slush in this case), and check the data I receive after mining.authorize, I get the following previous hash: ...
0
votes
0answers
25 views

What s the Bitcoin wallet or exchange house with the lowest fees? [closed]

What's the Bitcoin wallet or exchange house with the lowest fees?
0
votes
1answer
39 views

How To get Address Public Key from Account XPUB?

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] 2==> SHA-256 3==> SHA-256 Again 4==> ...
0
votes
1answer
18 views

Receiving transactions in prune mode

I am new to Bitcoin. I have downloaded the whole blockchain but I still can't access my wallets because I get a popup telling me to use prune mode. My question is: I know that I have received ...
0
votes
2answers
37 views

How bitcoin finds a few transactions earlier account balance from outputs?

I am reading and watching about transactions and they say a transaction's input is previous transaction's output. They all show diagrams in which these transactions are consecutive. How an account's ...
0
votes
1answer
38 views

Priv Key with 58 characters to WIF

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 ...
2
votes
3answers
1k views

Can a miner just introduce a block full of valid predetermined transactions in the blockchain and get rewarded?

My question is - let's say a miner has control over a certain number of bitcoin addresses. He creates a block containing small transactions to and fro from these accounts ahead of time in advance and ...
0
votes
1answer
39 views

Access coins stored at Cryptobridge?

I have just discovered, albeit far too late, that Cryptobridge has closed. Now, there is a lot to say about this particularly dodgy move, but I won't and I'll keep this simple: How can I access the ...

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