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 Š”ryptocurrency exchanges => Binance - Š”ryptocurrency exchanges => Topic started by: Bitcoin on Mar 14, 2022, 12:25 pm

Title: How to calculate the version (eg. in Python)?
Post by: Bitcoin on Mar 14, 2022, 12:25 pm
How to calculate the version (eg. in Python)?

I'm working through this medium post that describes all header fields of a block. The explanation of the version field is a little unclear for me.


For starters I'm trying to consider version = 1, as in the very beginning of the chain:


version_int = 1
version_hex = hex(version_int)
# from my understanding I need to add value 0x100000000 to the version
# though I do not understand why, currently I'm just taking this as a given fact
version_hex_min = hex(int(0x100000000) + version_int)[-8:]
# of course I need the little endian notation:
version_hex_min_le = binascii.hexlify(binascii.unhexlify(version_hex)[::-1])

This gives me the little-endian based hex value:


0x01000000

That I can obviously use to calculate the header hash for version 1.


When I check the latest block headers, I see a version like that:


0x20002000

That would result in the big endian hex representation:


0x00200020

And to an decimal int:


2097184

How does that number refers to the actual and current version and how do I extract the extra information that the miner used for this so called "overt ASIC boost"?


Source: How to calculate the version (eg. in Python)? (https://bitcoin.stackexchange.com/questions/112856/how-to-calculate-the-version-eg-in-python)