The procedure of sending coins to a Ghost Vault (either your own or somebody else's) is called “ghosting”, which essentially burns the coins and allows a user to re-issue them later as public coins with no attached history. Coins kept in the Ghost Vault remain private. The fee for ghosting your NIX is 0.25%, paid with publicly held NIX (it does not get subtracted from your ghosted NIX).
This feature was NIX’s first privacy transaction implementation and does not offer both sender and receiver privacy at the same time. If your transaction requires both, use 2-Way Ghosting.
Ghost keys make it possible to receive funds into your Ghost Vault. The "key amount" refers to the number of individual denominations that a ghost key can accommodate. The denominations are 0.1, 1, 10, 100, 1000, 1000. As an example, if you wanted to ghost 532.6 NIX, you'd need a key amount of 4 or more to allow for the use of the 100, 10, 1, and .1 denominations. If in doubt, you can always safely use the default of 10 for any transaction.
To begin, open your nix-qt wallet and click on the "Ghost Vault" button and be sure you are looking at the "Ghost NIX to Vault" tab.
By default, your NIX will be ghosted to your own Ghost Vault. Outside observers will be unable to tell that you still maintain possession of them.
If you'd rather send your public NIX to a different wallet, uncheck the "Ghost to Myself" box and paste in the recipients Ghost Key.
Your ghosted NIX will show as unconfirmed while still in the memory pool waiting to be added to the blockchain. Once they are added to the blockchain they will show as Ghosted.
The above examples of 1-Way Ghosting will privatize the transaction as shown:
In cases where you only want to privatize your sending address, you can Un-Ghost funds from your Ghost Vault into a receivers public address. This method is done from the "Un-Ghost NIX from Vault" tab, and there is no fee for this type of transaction.
This never-done-before technology enables the ability to launch powerful private smart contracts on chain while allowing zero knowledge proof transaction edged privacy.
Although the technical procedure for achieving sender and receiver privacy in one transaction is complex in the backstage, it can be summarized as sending coins from one Ghost Vault to another. A brief technical overview can be seen in the Commitment Key Pack Technical Paper. There is a flat rate fee of .1 for these vault to vault transactions, paid from the senders Ghost Vault (not subtracted from the transaction amount).
You must first have ghosted NIX in your Ghost Vault. You can begin your 2-Way Ghost transaction by clicking the "Ghost Vault" button followed by the "Un-Ghost NIX from Vault" tab.
Deselect the "Un-Ghost to Myself" checkbox, enter the recipients Ghost Key in the "Un-Ghost To: " input field and enter an amount of ghosted NIX to send.
Your 2-Way Ghost transaction will then be added to the blockchain with both send and receive addresses privatized.