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As there are a couple endiannesses used by Bitcoin, what is the proper way to encode the data parameter for a getmemorypool JSON API call?

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The "data" is not a number (only numbers have endian issues), but the raw byte data of a valid block. You may wish to read over BIP 22, which is the Draft-status standard detailing the getmemorypool protocol.

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Do you mean the data response for a getwork call? Because getmemorypool only returns version, previousblockhash, transactions, coinbasevalue, coinbaseflags, time, mintime, curtime, and bits.

If so, I answered that here.

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  • No, I'm specifically referring to getmemorypool call's data field, as in a whole, solved block, rather than just a block header. Maybe I shouldn't have called it "response", but a "parameter".
    – ThePiachu
    Commented Feb 26, 2012 at 5:37
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    In that case: it's a byte-per-byte encoding in hex of the serialized block, the same way it would be serialized on disk in blk0001.dat or on the network.
    – Pieter Wuille
    Commented Mar 6, 2012 at 0:58

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