Determining the genesis transaction value or genesis_tx Is there a way to determine the genesis transaction (genesis_tx) hash? I know the genesis block number but how do you determine genesis_tx? I am looking for this hash for an altcoin which was forked from litecoin.
The genesis block's coinbase transaction hash will be the same as the blocks merkle root because the coinbase transaction should be the only transaction in the genesis block. You should be able to find it in chainparams.cpp if the codebase is still similar to bitcoin, like so:
https://github.com/bitcoin/bitcoin/blob/master/src/chainparams.cpp#L125

assert(genesis.hashMerkleRoot == uint256S("0x4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b"));