Here is the info how staking is going to be added to the halo wallet.
Also it's useful if you want to implement your own custom staking scheme.
I have to clarify, whilst this does allow multi-signature staking however doesn't allow the cold staking which is a different concept and orthogonal to single/multi signature.
It's not necessary to use the block template and/or the block template sign key but makes the process way easier.
Not all of this stuff is implemented yet and some details wait for the upcoming hardfork.
Once per 16 seconds (more often makes no sense) you check your unspent coins
checkkernel [{"txid":hex,"vout":n}, ...] true
which usually returns
{
"found":false
}
or when you are lucky to create the new block
{
"found":true,
"kernel":{"txid":hex, "vout":n, "time":time},
"blocktemplate":hex,
"blocktemplatefees":fees,
"blocktemplatesignkey":hex
}
blocktemplatefees is in satoshi
Then you create the coinstake tx, using info returned by checkkernel, as
follows:
create empty tx
set time to the kernel time
add the kernel input
if you want then add more inputs (which have at least 500 confirmations)
Now we need to know the reward, so call
getstakesubsidy coinstake
returned stakesubsidy is in satoshi
Then calculate the output amount of the coinstake tx: sum of inputs + stakesubsidy + blocktemplatefees
Continue to build the coinstake tx:
add output to empty script, 0 coins
add output to script "OP_RETURN blocktemplatesignkey", 0 coins
add output to your addr, N coins (or split it to a few outputs)
sign tx
Last step you call
submitblock blocktemplate {"coinstake":hex}
It will add coinstake to the block template, recalculate merkle tree, sign
block, and announce it to the network.
