What is the format of the value of a transaction in the litecoin ledger
The transaction format was never altered in the clone Tenebrix or its clone Litecoin. The bytes you have posted are correct, and do indeed decode to 50 BTC when read out as an unsigned, little endian, 64 bit integer.

~&gt; python
&gt;&gt;&gt; import struct
&gt;&gt;&gt; struct.unpack("&lt;q","\x00\xF2\x05\x2A\x01\x00\x00\x00")[0]
5000000000