All Questions

I tried to send bitcoin but the recipient hasn't received it. The trade block page shows "Nonstandard output" under outputs as shown in the link below: Tradeblock page for transaction I used an ...

I am using ElectrumX I am developing a cryptowallet, and when I ask for the historic data about a specific XPUB I get a list of transactions id, and when I ask for the information of those ...

I want to install Bitcoin Core wallet on my computer, but his blockchain is too big (more 230 Gb). How to reduce Bitcoin Core wallet?

I see very frequent blocks on testnet3: more than 18000 since 2019-02-18T06:28:34Z, it's one per 1.76 seconds average. blockcypher.com states that highest block is 1458714, but my node got 1475843+. ...

The Czech Republic will host Blockchain & Bitcoin Conference Prague March 22, 2019 for the fifth time – the event about blockchain and cryptocurrencies organized by Smile-Expo. The conference will ...

I have bitcoind running in regtest mode. I want to connect my bcoin wallet to it and retrieve all UTXOs relevant to the sender's address. How can I do that?

in this link, they say “increasing the block size above 1 MB requires a hard fork.” In this example, an actual block chain fork is not required—but it is a possible outcome. but i can't ...

When a node requests one of it's neighbours for a list of it's peers, that node responds with a list of all of it's neighbours. I'm just wondering is there a way to confirm that those nodes are ...

From this: the arrival of a new block has special significance for a mining node. The competition among miners effectively ends with the propagation of a new block that acts as an announcement of a ...

I need help broadcasting a non standard transaction transaction.

So after getting here, I have forgotten why you even want to validate a transaction is in a block, and how exactly this works. Wondering if one could explain In what situation you want to validate a ...

What does the -server option do in bitcoin node? https://en.bitcoin.it/wiki/Running_Bitcoin says 'Accept command line and JSON-RPC commands'. However I can't see any difference whatsoever. In both ...

I am just understanding the Bitcoin network, and now understand that every block and every transaction is propagated to every node in the Bitcoin network (not sure yet the difference between full vs. ...

I am reading this and now wondering why the blockchain isn't just implemented as a Merkle tree, or the reverse, why you can't just have a single data structure (i.e. a transaction chain) instead of ...

I understand how Proof of Work (PoW) works now, and am beginning to look at different Proof of ... systems like these: Proof of Stake Proof of Ownership Proof of Existence Proof of Space From what I ...

Transaction created as same others, but status - 0/unconfirmed And txid nod found in block explorers Transaction ID: e9c858f852a1de7c70e6f8377f2147f3def1d4b1d85a5947d028bb9c13450318 How to succefuly ...

I am new to understanding Bitcoin, but just read this: If an UTXO is larger than the desired value of a transaction, it must still be consumed in its entirety and change must be generated in the ...

On an elements sidechain (e.g. liquid) could you open a lightning channel with a confidential transaction. You could probably open a payment channel but could the channel 'speak' to other channels? Or ...

I want to test and develop an open source mining pool. I don't have access to an ASIC miner or GPU, so I have to use my CPU to simulate mining and see how the pool really works. The problem is the ...

sec Standards for Efficient Cryptography 256 256bit prime k1 Koblitz curve no. 1 ?

I understand how transactions are grouped into blocks. However, I don't understand why this is necessary in the first place. If it's a mining thing, I don't see why the miners can't just update the ...

I'm new about this market and I don't know if there's some limits about the transactions on the copay wallet. I think to use this wallet for personal and business transactions. Someone can answer me ...

I am missing something so far in reading this (excellent resource). I read the part about transactions for the most part, but I don't understand the actual code evaluation part, and how long it takes. ...

So I am reading this (excellent resource) on the Bitcoin merkle tree for a transaction. The merkle tree is constructed bottom-up. In the following example, we start with four transactions, A, B, C, ...

I am thinking of a simple sum operation, which entails iterating through a set of integers and calling add for each. But the add operation could be implemented using complex stuff for handling BigInts,...

When you first learn about blockchain it is made out to be a single public blockchain that contains all transactions from all users. But when you start considering privacy and performance, it seems ...

I have just read this which talks about creating private blockchains and using a unique public/private key per transaction so you can't be traced. There are also "Zero-knowledge proofs" which I'm not ...

I understand that Bitcoin's ASICs are a highly optimized piece of equipment and, therefore, are also very specific. My question: are they able to do a single (or triple?) SHA-256 hash at all? And, ...

Please help. After downloading the Bitcoin wallet, I don't have the option to 'run' it on my windows 8.1. It was a compressed file, and even though I extracted everything, there is nothing that ...

Recently upgraded to the latest lnd version (following the stadicus guide) but once i restarted the client i keep getting this error when i check the logs: [ERR] LNWL: Failed to process consensus ...

I have been reading about and researching on Blockchain Technology for quite a while now, and what I can comprehend from the very primitive architecture of these "Distributed Databases" is that ...

I have successfully cloned a POW/POS coin based on compound coin, generated the merkleroot and genesis block and a running gui wallet on Ubuntu 16.04.  The question now is how would I start to pre-...

So I just bought this antminer t15 and when I powered it on, It was working fine, I was able to set it up, I located the ip of the device then I configured the pools in ant pool.com , had to update ...

hi send btc from binanace exchange to new blockchain wallet account and transction showing in btc history in blockchain wallet but btc wallet balance still zer0 value i did btc 4 transaction binance ...

I have bitcoin core wallet 17.1 I sent 85$ to 32yF1MuqbUmKsGZE7jedkZV8PVJRuimRAu to one of my wallets but all my wallets shows 0 balance, why? https://www.blockchain.com/btc/address/...

What is the latest required hash rate to mine a block of bitcoin ? How much power do you need to mine a block in a day ? Thank you

Could you please help me understand these observations related to Bitcoin transaction? I have setup a brand new wallet from scratch and I sent 0.0246 BTC to it (well, slightly more but after the fees ...

“If the number of nodes that agree exceeds 2/3, the blocks or transactions of clients will be accepted” Practical Byzantine fault tolerance (pBFT) : (n - 1) / 3 I read those 2 things in a PDF that a ...

Can a country be determined to whom the bitcoin is sent?

I’m a software developer and I was wondering if this can work (According to my point of view it could work but I’d like to get some feedback) Two types of Nodes: Proposers, Validators. 1) Proposers ...

I've read other questions (and their answers) on this but I still don't see the use for internal addresses. I get that you're supposed to send the change of a transaction there but I don't see how ...

bitcoin core 17.1 https://www.blockchain.com/btc/tx/c6b5d45821f8aad166eb0c6afc9826df5710235a8576b952d606f49cd82a27f9 what is the best way to solve this issue?

According to wiki, if we had m generals, than we need 2m+1 to meet consensus. So it's about 66.6% + 1 generals But what the reason to use consensus like BFT? Why we can't get result of the most (50%...

I'm newbie in blockchain world, so I'm curious what is the difference between installing full node by using libs such as bitcore-lib (using node.js) and installing it through the daemon (mentioned ...

In the official document of bitcoin.org, they ask to use an init script instead of cron job, see the init scripts directory in Bitcoin Core’s source tree. But the link is not working Bitcoin Core’s ...

A paper entitled: "Privacy in Bitcoin Transactions: New Challenges from Blockchain Scalability Solutions" has tried to investigate privacy issues of the Bitcoin influenced by the solutions for ...

If a miner misbehaves, can other miners “boycott” him/her by refusing to build on top of his/her blocks in the future? Will such a “boycott” keep the miners from behaving badly?

I want to generate a block with specific transaction via bitcoin-cli on regtest. The "generate" command does not have the option. It collects transactions in mempool by the default rule. I guess I ...

I have bitcoin-core installed, I am running it in testnet mode. Now if I want to fund my wallet, I need to know the receiving address. How do find my receiving address, so that I can fund it and then ...

How to easy run Electrum wallet without its installation on Linux? I want to run it from a single user account with no sudo. It is possible?