Shielded Types (stypes)

This is the magic trick of Seismic. To make any piece of data invisible to the outside world, you just add an s in front of its type:

uint256 publicBalance;    // Everyone can see this
suint256 secretBalance;   // Nobody can see this

That's it. The s stands for "shielded".

There are shielded versions of all common types:

• suint / sint — Hidden numbers
• sbool — Hidden true/false
• saddress — Hidden wallet addresses

To anyone looking at the blockchain, shielded values just show as 0x000. The real value is only visible inside the secure TEE chip.

Here's what a private token balance looks like on Seismic:

// Private token balances — nobody can see who has what
mapping(saddress => suint256) balanceOf;

function transfer(saddress to, suint256 amount) external {
    balanceOf[saddress(msg.sender)] -= amount;
    balanceOf[to] += amount;
}

This works just like a normal Ethereum token, but nobody can see the balances or the amounts being transferred. Not even which addresses are involved.

1. You can't return shielded data from public functions — that would expose it!
2. Converting stype to normal type reveals the value — be careful with that.
3. All normal operations work — +, -, *, ==, etc.

Think of it like sunglasses: once data is shielded, you have to deliberately take the sunglasses off to see it.