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Bitcoin: How to know who mined a particular block? [double]

Published by Terlumun Aondover on February 5th, 2025.

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Decryption Block Mined by a Bitcoin Node

As the world’s largest cryptocurrency network, it is crucial for anyone interested in blockchain technology and mining to understand how Bitcoin blocks are mined. In this article, we will delve into the process of determining who mined a particular block on the Bitcoin blockchain.

Decoded Hex Value: A Simple Approach

One common method for identifying the miner of a block is to analyze the
OP_RETURN (Output Parameter Return)

decoded hex value in the first transaction that created the block. OP_RETURN is a special output type that allows miners to create custom transactions without storing them on the blockchain.

Here’s how it works:

Each block contains two types of transactions:
Normal Transactions and
OP_RETURN Transactions.

Regular Transactions contain the necessary data to create new coins or assets, while OP_RETURN Transactions have a unique purpose.

When a miner creates a new block, he chooses a NP (New Prize) that can be used to mine new coins or assets.

The first transaction in the new block is called the
Pre-Miner Transaction, which contains the NP and other necessary data.

Decrypting OP_RETURN Transactions

To analyze OP_RETURN transactions, you need to decrypt the hex value of each output address:

Open a Bitcoin client or use an online tool that supports decoding hex values.

Find the first transaction in the new block (usually the
Pre-Miner Transaction) and identify the output addresses.

Analyze the hex values of these addresses to determine which ones belong to OP_RETURN Transactions.

Identifying the Miner

To find out who mined a block, you need to consider several factors:

Block Header: Check the Merkle Root hash of the block header to identify potential mining candidates.

Transaction Count and Hashes
: Look at the number of transactions in the new block and their hash values (i.e. hex values).

Hash Power Distribution: Analyze the hash power distribution across different nodes, as this can indicate who has the necessary computing resources to mine.

Conclusion

Decrypting Bitcoin blocks involves analyzing OP_RETURN transactions and understanding the roles of block headers, transaction counts, and hash power distribution. By considering these factors, you can determine who mined a particular block on the Bitcoin blockchain. While this method is not foolproof, it is a good starting point for anyone who wants to learn more about Bitcoin mining.