Bitcoin

Questions tagged [getblocktemplate]

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A protocol to allow pools to specify a set of valid transactions but give the control over which transactions to include to miners.

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How to call `getblocktemplate` without running a full node?

I was trying to get into bitcoin mining but I could not find any useful information on calling getblocktemplate without downloading the entire blockchain. Is there a way to get blocks for mining ...
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30 views

How to parse output from getblocktemplate in python?

I am able to connect to testnet and make a RPC call to getblocktemplate , but stuck at the point as how to parse the output to start minining . I referred to https://github.com/luke-jr/python-blkmaker ...
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1answer
68 views

How to get unconfirmed transactions

I am trying to learn how mining is done in bitcoin , wrote a simple mining code in python that works fine on sample data set of raw json coming from https://btc.cryptoid.info/btc/block.dws?693649.htm, ...
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2answers
632 views

Why does the mined block differ so much from the block template?

I am looking at the specific block at height 680175. At the time when the block was not mined yet, I received the block template via bitcoin-cli getblocktemplate '{"rules": ["segwit&...
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0answers
86 views

Is there any way to test that a mining system is set up correctly (solo mining)?

I am running a full node and have written some mining software to learn more about how bitcoin works. I know that the chances of mining a block are basically zero given my hash rate, but I am curious ...
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92 views

Endianess of txids when calculating Merkle Root from getblocktemplate

I am trying to solve a merkle root from a previously mined block. Specifically this block... https://www.blockchain.com/en/btc/block/000000000003ba27aa200b1cecaad478d2b00432346c3f1f3986da1afd33e506 ...
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46 views

Mining with getblocktemplate for specific number of transactions

Can you control the number of transactions in a getblocktemplate curl/get request ? Given that you can exhaust 4 billion nonces . I'm wondering how you vary the number of transactions without varying ...
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1answer
149 views

Block version 0x20000000

When i run getblocktemplate, Bitcoind gives me in the version field a decimal number, when i convert it to Hex it's 20000000 I know it must be in little endian, but to build the blockheader must i put ...
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1answer
335 views

reconstruct block template from stratum mining.notify

I have a mining notification from a stratum pool. I wish to write a general script to extract the value of the block reward that the pool is taking. That is, reconstruct the block template, or at ...
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1answer
74 views

getblocktemplate request that omits transactions?

Is there a way to make a getblocktemplate request that returns only the bits/target, or at least omits all of the pending transactions? I am interested in tracking the coin difficulty in real time. ...
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537 views

CPU Miner return Internal Server Error for getblocktemplate request

I was developing an altcoin using bitcoin v 0.17. I am using CPU miner for mining purposes. I started the miner using this command: ./minerd -a sha256d -o http://localhost:19230 -O adreno:adreno@123 -...
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1answer
412 views

getblocktemplate fails in regtest mode even when it is connected to the other node

I have created two nodes and connected the 1st node with the 2nd node in regtest mode . Now when I make the getblocktemplate command using bitcoin-cli . It fails with bitcoin is downloading the block. ...
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233 views

Is my understanding of Blockhain Endianness correct?

I know questions on this topic have been asked to death in a number of different ways. I also know that what endian order refers to specifically is dependent on context. What I want are some ...
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2answers
87 views

Where does this pattern in the feerate distribution per block originate from?

While building a tool/visualization that displays the feerate of a transaction according to it's position in a given block I came across a patter in some blocks. I expect a typical block to start ...
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1answer
202 views

Building the merkle root from transactions in a template block

I want to compute the merkle root for transactions in a given template block - bitcoind:getblocktemplate(). I understand the merkle root is a hash of all the transactions in a block from the last ...
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1answer
535 views

bitcoin fork getblocktemplate keeps reporting downloading blocks

I got my own hard fork of bitcoin from forkgen.tech. The fork has happened after block 506016. I have 2 nodes running and after syncing up to block 506016, I want to run a pool server. But the ...
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153 views

Why did GBT fail?

GBT was a way to stop miner centralization, but no one used it, everyone continued to use Stratum. Why did it fail?
2
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1answer
720 views

How does bitcoin reward who find the block?

After getting the getblocktemplate, hashing it, finding a solution and generating the proper message to submit to the blockchain, if i ever solve a block how does the network knows it was me and ...
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2answers
1k views

How i can delete last block from blockchain? altcoin

How can I delete the last block from blockchain to be ready for hardfork. What I mean is, in blockchain last block is with error's. I want to delete those blocks, for the new blockchain is disabled ...
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0answers
364 views

Does Stratum cause mining to be more centralized than getBlockTemplate would?

I read the question "I don't understand the "51% attack" problem. Why does a mining pool have power with a 51% share?" and its anwers. That made me wonder that since the GBT protocol is ...
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1answer
416 views

Why does getblocktemplate use priority for transaction selection?

I don't know how getblocktemplate works exactly, but it seems to include transactions based on priority. Selecting transactions based on priority isn't the most profitable method for building a block ...
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1answer
651 views

How does getblocktemplate select transactions?

I wrote a script that compares the transactions listed in the memory pool with the transactions included in getblocktemplate: http://learnmeabitcoin.com/explorer/node/memorypool (I've ordered the ...
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2answers
963 views

How to compute merkle root without coinbasetxn?

How do you build a merkle root without a coinbase transaction? I compute the merkle root without the coinbase portion and I get a different root then the submitter.
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1answer
375 views

Question about getblocktemplate

I'm having trouble understanding getblocktemplate. From https://en.bitcoin.it/wiki/Getblocktemplate, I see how to build the block header and then begin hashing by incrementing the nonce, the same as ...
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1answer
117 views

How does the getblocktemplate request rate correlate with a miner's hashrate?

What is the relationship between a miner's hashrate and the getblocktemplate (GBT) request rate? (The question here, "How does the rate of getwork requests correlate with the hashrate of a miner?," ...
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2answers
2k views

Work distribution in a mining pool

How is work distributed among members of a pool? Regarding the block hashing algorithm and valid hashes of a new node, how is the set of solutions for nonces "distributed" among miners?Is a nonce, ...
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1answer
1k views

Bitcoin testnet: "Bitcoin is downloading blocks..." and other problem

I'm trying to setup a local testnet with multiple nodes. Currently I have three nodes, and their mining powers are almost the same. Things have been quite ok so far, except some problems that I need ...
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2answers
1k views

How often should I call getblocktemplate?

I'm building a basic Bitcoin client in c# to better understand the mining protocol. I need help understanding Getblocktemplate. I have read the Getblocktemplate wiki, but I'm still having an issue ...
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1answer
1k views

Difference between coinbaseaux.flags vs. coinbasetxn.data?

After reading through most of the protocol, and trying to piece everything together, I'm still at a loss as to how some things work. For example, the difference between coinbaseaux.flags and ...
3
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1answer
804 views

Do pool servers communicate with bitcoind, and in what capacity?

I'm trying to understand how the whole process flows. Here's how I currently understand it working. Mining client -> Pool server -> Bitcoind getwork: Mining client calls getwork from ...
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2answers
4k views

How to hash data from 'getblocktemplate' request

I've been reading lots of articles, trying to understand how to hash the data returned from getwork; but I totally overlooked getblocktemplate. I'm just trying to understand how all the data below is ...
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2answers
7k views

Protocols for use between mining clients and mining pool servers

Which protocols are there for mining clients to communicate with mining pool servers? How do they compare?
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1answer
1k views

Difference between getwork and getblocktemplate? [duplicate]

What are the differences between getwork and getblocktemplate? Who identified the need for the new protocol? Who were the primary contributors to its creation?
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1answer
990 views

Should I use getwork or getblocktemplate

I am working on an fpga mining device just for fun. I realized that there is a getblocktemplate function which replaces the getwork Json-rpc call. So do I need to switch over to it and change all the ...
6
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1answer
3k views

What is the standard protocol for pools/miners?

The Bitcoin client protocol is well documented in the Bitcoin Wiki, but I can't find much on the protocol used by pools and miners. Is it described anywhere?

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