I am in the works of making a pool-compatable fully python miner, and I need to know how to generate the blockhashing blob for the miner.
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Step #1 in this answer details how to get a blockhashing_blob.
If you plan on creating it yourself instead, this is much more involved. You would have to deserialize the blocktemplate_blob, calculate the merkle tree root hash for the blocks transactions (including a newly constructed coinbase transaction), then concatenate the block header, merkle tree root hash and transaction count (as a varint). That would get you a manually constructed blockhashing_blob. Doing this in just Python will be a big task.
It's worth noting, a pool-compatible miner doesn't need to create a hashing blob as the pool gives the miner the blob to hash.
