Question: can anyone explain to me how dash instant pay works?

[Jibreel]

from ehat I understand... the node are the ones that provide conformation for the transaction. Does this mean that this process is happening outside of the blockchain? Or are the master nodes providing conformation of the payment by checking the blockchain to see that funds are available... and then the instant pay transaction will be included in the next block?

And does this mean that even though the master node, the sender and receiver see the transaction as having gone through, the rest of the network will only be made aware when the next block is created. So what's the difference between that and in Bitcoin when you wait until the next block for conformation.

Really just wondering about the actual mechanics of how this works. And how this is an improved solution over others?

Thanks.

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[Jibreel]

Have I worded this in a muddled way? Or is this the wrong place for this question? 

[ArticMine]

A subset, I believe it is fifteen, of the masternodes is randomly chosen and they then vote on approving the transaction. If a majority votes for approval then the transaction is approved.  One can compare this to having fifteen banks randomly chosen to approve a transaction instead of just one bank approving a transaction as is the case with a typical centralized ledger.