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I am writing a program that reads Bitcoin transactions from .blk files and performs some analysis on them. I would like to get the transaction destination addresses (like in some transaction explorers: link.
Raw transaction data looks like this and I don't see any address fields anywhere.
How is it possible to calculate it? Is there a (preferably C/C++) program that already does that? Or are there any details on how to implement this?
Best regards and thanks for all answers in advance! :)
Raw transaction data looks like this and I don't see any address fields anywhere.
That's because transactions don't directly involve addresses. An address is an abstraction of a Bitcoin-script used in a transaction. An address is a way for a payee to externally communicate to a payer enough information for the payer to construct an output entry for a new transaction.
are there any details on how to implement this?
See for example https://learnmeabitcoin.com/technical/p2pkh
So for a pay-to-public-key-hash (P2PKH) address you:
- Calculate a Hash160 (SHA256 + RIPEMD160) of the public key
- Prefix that hash with 0x00
- Suffix with a checksum (first four bytes of a SHA256 hash of other data)
- Encode in Base58
You'd need to separately handle address formation for every standard type of Bitcoin-script. Some don't have a standard way to derive an address.
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