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Questions tagged [merged-mining]

Merged mining is a technique where the same proof of work can be used to secure more than one block in different hash chains. This allows a miner to mine more than one currency at a time and contribute his hashing power to all of them.

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How does blind merge mining (BMM) work?

Proposals like Spacechain and Drivechain rely on blind merge mining (BMM). But how does it work and how it differs from normal merge mining?
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What are the mean, median, range, limits and trends in the size of coinbase transactions?

I'm attempting to estimate how much "spare capacity" there is for merged mining protocols. As I understand it the scriptSig in the coinbase transaction must be less than 100B. However, the ...
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Which merged mining method is preferable? What is the latest specification/practice?

If I'm right, there are at least two methods for miners to include a reference hash to a merge mined block in the coinbase transaction: Commitment hash in an OP_RETURN out put in the coinbase ...
Lee's user avatar
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What is OP_RETURN b9e11b6d?

While investigating some Bitcoin coinbase transactions, I notice that a lot of them have an output of the form OP_RETURN OP_PUSHBYTES_36 b9e11b6d… where ‘…’ is 32 bytes, probably a hash of something. ...
George Lowther's user avatar
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Whatever happened to Bitcoin miners mining additional coins in combination with Bitcoin mining like pre-2015?

Back in the early days of Bitcoin mining, many people were dual mining namecoin with bitcoin and some other coins. Why don't we hear anymore of this dual mining functionality in 2021+? What were some ...
Patoshi パトシ's user avatar
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1 answer
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What are the incentives for miners to include a RSK merge-mining block hash in the coinbase?

The RSK blockchain is merge-mined with a block time of around 30 sek. Blocks are produced when bitcoin miners create valid block headers within the target. The RSK difficulty is far lower than bitcoin'...
Bertram Lund's user avatar
2 votes
1 answer
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what's the purpose of the chain_id in merge mining?

I'm considering adding merge mining support to coin x. Its parent chain will be coin b. In looking at the spec (https://en.bitcoin.it/wiki/Merged_mining_specification) and Dogecoin/Namecoin sources, I ...
Brannon's user avatar
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Which crypto currencies can merge mine with Bitcoin?

I remember namecoin has the ability to merge mine with Bitcoin. Are there any others? Is this a bitcoin ability or ability of the coin that is merge minable?
Patoshi パトシ's user avatar
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1 answer
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How do you merge mine rootstock with bitcoin on an Antminer?

I hear that you can merge mine rootstock coins with existing bitcoin mining hardware by doing merge mining. Is there a tutorial on how to do this? Or is there a pool one can just join?
Patoshi パトシ's user avatar
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1 answer
615 views

How to mergemine all SHA-256 altcoins?

Let's say I implemented AuxPOW to all of the alt coin wallet. Would it let me merge mine them with Bitcoin or the developer would have to implement them?
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Do Bitcoin miners verify validity of merge-mined Namecoin blocks?

I've been reading a little about merged mining as used in Bitcoin and Namecoin. It seems like merged mining effectively eliminated Namecoin-only mining pools, right? Since Namecoin-only pools are ...
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Nonce in Merged Mining

When mining Bitcoin, the nonce is included in the header, which is then hashed and checked to see if it is below the target threshold. Everybody can verify that the header does indeed hash below the ...
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How does merged mining work on a technical level?

In bitcoin, miners hash the header twice with the SHA256 function. This header consists of the fields listed below, as described by this question. version previousHashBlock merkleRoot time ...
abeikverdi's user avatar
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1 answer
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How to set up for merged mining

I plan to eventually add litecoin, Dogecoin, and possibly some other scrypt merged-minable coins to my pool. Are there any tutorials or other information available that would show me how to set my ...
Scott's user avatar
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What restrictions does merged mining place on the sidechain?

What restrictions are imposed by merged mining on the structure or functionality of a side chain (besides it having to use the same PoW schema)? For example, could the side chain have a higher block ...
Jorge Stolfi's user avatar
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How can I remove the charity features in my Devcoin clone?

I'm trying to produce a SHA256 altcoin which is merge mined with Bitcoin. I'd like to use some recent code, rather than base in on a 0.8.* or earlier codebase. I've found this source: https://github....
Spencer Dupre's user avatar
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Complete list of merged mineable coins? SHA256 + Scrypt [closed]

mmpool.org mines these SHA256 PoW coins: Bitcoin Namecoin Ixcoin Devcoin I0coin Groupcoin https://en.bitcoin.it/wiki/Merged_mining_specification claims that it is only used by Namecoin Is there a ...
darkAsPitch's user avatar
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p2pool merged mining

I installed p2pool on my server for triple merged mining - VTC, MON, PLX. Server is running smoothly, but I don'know how to setup my addreses in miner. I have read that you can add for example MON ...
minus1's user avatar
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How are block rewards claimed in merged mining?

How do you claim a block reward on a merged chain? If I understood it right: let's say you are mining Bitcoin and Namecoin. When you find the solution to a BTC block, you include a transaction in the ...
G B's user avatar
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2 answers
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Are sidechains really new?

People have been talking a lot about side chains, but I thought this has been around for a while under a different name. Coins like Namecoin, Devcoin, ixcoin, i0coin, groupcoin, etc are all merge ...
Mark's user avatar
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How is a side-chain merging back to Bitcoin chain protected against double-spend? Where are the side-chain mining fees?

I am struggling to understand the concept of "side-chains" that's discussed a lot lately, but never trully explained. How I understand "side-chain": it's an altcoin, with a separate blockchain, with ...
Karel Bílek's user avatar
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How does namecoin and other merge-mined coins prevent pre-mine attacks?

So, namecoin supports merged mining against bitcoin. My understanding of the merged mining protocol is that basically miners can use the primary coin's POW solution to solve the aux coin's block. It's ...
Earlz's user avatar
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2 votes
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Not getting merged mined coins on p2pool

I have been able to mine successfully on my bitcoin p2pool. I set up merge mining according to the guide found here https://bitcointalk.org/index.php?topic=62842.0 and everything seems to be running ...
Mark's user avatar
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Merged mining: are there any ways to prevent it?

Supporting merged mining allows a cryptocurrency A to improve the security its blockchain (increase the hash rate) by accepting work done on the blockchain of cryptocurrency B through insertion of a ...
Johannes Tynes's user avatar
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Merged mining scrypt coins [duplicate]

I've been reading around the last day or so on merged mining for coins, in specific scrypt coins but there seems to be conflicting answers, can someone let me know which of the following is correct a)...
James Kirkby's user avatar
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6 answers
8k views

Scrypt based merged mining pools

Does anyone know why there are no Scrypt based merged mining pools out their yet? I would imagine that if it was possible it would have been done already. There is no problem to do it with SHA-256 ...
User2344452's user avatar
5 votes
1 answer
270 views

How does a miner insert the hash of a merged-mined alt chain's transaction into a Bitcoin transaction?

I've read the how does merged mining work? thread and I'm a bit confused as to how one of the transactions in the bitcoin block "stores" the hash of the Namecoin block. Where is this information ...
bvpx's user avatar
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Merged Mining Disadvantages

What are the disadvantages of merged mining? I'm very interested in p2pool and since I have to "run my own server" I've been considering enabling merged mining. Besides the obvious administration ...
David Kassa's user avatar
1 vote
1 answer
291 views

What ultimately happens to mining if blocks contain mostly non-Bitcoin data?

I'm trying to understand what can happen if A block consists entirely of 3rd party (xCoin) data like Namecoin There are no Tx fees to collect since they are on alternate chains. Assume that the ...
makerofthings7's user avatar
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1 answer
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Can ASICS Merge-Mine?

Can ASICS in general, and specifically any of the models coming out soon merge-mine other cryptocurrencies?
Kinnard Hockenhull's user avatar
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2 answers
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What is needed to create a pool with merged mining?

What is needed to create a new pool with merged mining? (Bitcoin, NameCoin, and possibly others)? I'd like to create a new pool that will Include transaction fees in the payout Charge no pool fees ...
makerofthings7's user avatar
9 votes
5 answers
1k views

Specific namecoin address in merged mining

I want to do merged mining with P2Pool, and I want any generated namecoins to go to a specific namecoin address in my wallet. I haven't seen a way to configure this in P2Pool or namecoind, and Google'...
Daniel H's user avatar
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7 votes
1 answer
422 views

Does merged mining require clients to download both blockchains?

Suppose I want to start an AltCoin, and set it up for merged mining with Bitcoin. Will it require the AltCoin end-users to also download the Bitcoin blockchain to verify the hashes embedded in the ...
Maestro's user avatar
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11 votes
2 answers
938 views

Detecting dishonest merged-mining pool

How would one go about detecting whether a mining pool is being dishonest by performing merged-mining without sharing the Namecoin income with its miners? We assume that: The pool is operating ...
ThePiachu's user avatar
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4 votes
1 answer
427 views

Where can I find some guidelines on how to program a merged mining transaction?

In answer to question "How does merged mining work?", we can read that in order to merged mine, we need to create a Bitcoin transaction containing a Namecoin block hash and put it on the tip of the ...
ThePiachu's user avatar
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3 votes
1 answer
403 views

How to merged mine with getmemorypool RPC command?

The getmemorypool RPC command lists all transactions that are to be included in a block, with the exclusion of the generating transaction. In merged mining, one needs to add an extra transaction ...
ThePiachu's user avatar
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4 votes
2 answers
355 views

Merged mining custom bitcoind

What are the core changes to bitcoind that allow one to merge-mine? Are there any new JSON-RPC commands that are enabled, or changes to the existing ones?
ThePiachu's user avatar
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12 votes
1 answer
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Why do namecoins have any value?

Many Bitcoin mining pools offer merged mining with Namecoin, and there are places where one can buy and sell BTC for NMC and the other way around. But, why would anyone want to own NMC? As far as I ...
Martin Josefsson's user avatar
8 votes
2 answers
468 views

Which Namecoin block was the first one to be generated by merged mining?

For a definitive record is it possible to determine if a namecoin block was generated via merged mining? Is so which was the first one. Which is the first bitcoin block to have namecoin information ...
DeathAndTaxes's user avatar
9 votes
2 answers
1k views

Does encoding Namecoin/messages into the blockchain bloat it?

I read today twice concerns about inflating the blockchain: NameCoin Bitcoin Message Service So, does using these services "over inflate" the blockchain? The way I see it, if another protocl rides ...
ripper234's user avatar
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5 votes
5 answers
723 views

Will merge mining patch make Bitcoin network mining power available to anyone?

I think Namecoin has a good value, but while I think Vladimir overestimates the inflation effect of merged mining, I still mostly agree with his post, which is negative towards uncontrolled merged ...
Serith's user avatar
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13 votes
2 answers
644 views

Will merged mining mine each chain as efficiently as non-merged mining?

Let's say I get a hash rate of X when mining either Bitcoin or Namecoin. When using Merged Mining, will I be able to still do X concurrently on both blockchains, or will I do significantly less than ...
ripper234's user avatar
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110 votes
4 answers
82k views

How does merged mining work?

How does the implementation of merged mining affect the global hash rate of alt chains? Does one solution fit all? Does one solution fit some? Does the rate of "solutions that will fit" decrease ...
MaxSan's user avatar
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10 votes
1 answer
811 views

When did merged Namecoin-Bitcoin mining start?

(This question was originally asked before merged mining began) When exactly did merged mining of Bitcoin and Namecoin chains start?
ripper234's user avatar
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