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Given an address (i.e. 1BnPVV5Tt25cxbDg6DqoxJunjSL8reCGz6), how can I calculate its scriptPubKey in order to build a transaction?

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I assume you want to integrate it into a P2PKH tx. You would have to base58decode the address, and then remove the checksum and the network byte. Then you can integrate it into a P2PKH tx in the std. way:

76 A9 14 <20 Bytes> 88 AC

I have two references with some code examples in C and python, that helped me at the time, when I had the same question :-)

https://bitcointalk.org/index.php?topic=1543429.0

https://bitcointalk.org/index.php?topic=1026.0

and some online "play tools" to verify:

http://gobittest.appspot.com/Address

http://lenschulwitz.com/base58

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