Questions tagged [getblocktemplate]

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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Why is the block header version value different from the getblocktemplate version value in the bitcoin blockchain?

When looking at block header for block 746632 I see that the version is 1073676292 or 3fff0004 or when reversed 0400ff3f, but the version I received from a getblocktemplate request is 536870912 or ...
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MerkleRoot requires transaction hash to build a merkle tree.... Is that the "hash" key/value within the getblocktemplate response or the "data"?

I've created a function for parsing Json Objects and values and just when I think nothing can stop me, just when I feel like I'm the king of the blockchain and I can finally join in on the mining race ...
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What exactly is the data required when creating a coinbase transaction? How do I insert the blocks height into the coinbase transaction?

Still trying to write a function to properly create a coinbase transaction and the only thing I can't seem to get a hold on is..... How to get the block height provided by getblocktemplate into the ...
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Can Bitcoin Core 0.9.5 still fully sync?

Solo Linux GPU bitcoin miner here (doing it for fun not profit so please, no 'what's the point' answers). Working mining software for this purpose is far and few in between, but I have been able to ...
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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?
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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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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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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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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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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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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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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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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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13 votes
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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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2 votes
1 answer
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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7 votes
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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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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 ...
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3 votes
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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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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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5 votes
2 answers
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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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-1 votes
1 answer
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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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1 answer
1k 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 ...
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6 votes
1 answer
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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