# The sealed strike, and how the draw is fair

> A case seals a disclosed pool of real coins. One pull draws one of them, at the odds printed on the case — and every draw can be checked by anyone.

*5 min · All collectors*

## 1. What a sealed strike is

An issuing house takes a handful of real, vaulted coins from one collection — say three of a silver design and one of a gold — and seals them into a case with a single price. The case page lists exactly what is inside, design by design, and the share of the pool each one makes up. Nothing about the contents is hidden: the count of every design, how many remain, and the odds of the next pull are all on the case before you decide.

## 2. What you always receive

Every pull draws one certificate from the pool, and every certificate is a real coin sitting in the vault under your name the moment payment settles — insured, tradeable, and yours to ship home later if you wish, exactly like a coin you bought from a drop. There is no empty pull and no consolation token: the pool is made only of coins, so a pull can only ever land on one. Which one is decided by the draw below, never by anyone at Bifrost or the issuing house.

## 3. How the draw is fair

When a case is sealed, Bifrost generates a secret seed and publishes its fingerprint — a hash — on the case page. The seed cannot be changed afterwards without changing the fingerprint. When you open a strike, your browser adds a seed of its own, bound to your order before you pay, so neither side can choose after seeing the other's. At settlement the two seeds and your pull's number are combined into one code (an HMAC), and that code points at one position among the coins still in the pool, counted in a fixed order. The coin at that position is yours. Once the last coin is drawn, the secret seed itself is revealed on the case page.

> The fingerprint on the case is your proof that the seed was fixed before anyone pulled — check that it matches the revealed seed once the case closes.

## 4. Checking a draw yourself

Every pull keeps its proof: the seed fingerprint, your seed, your pull's number, the size of the pool at the time and the position drawn. With the seed revealed, anyone can recompute the code and the position and see that it lands on the same coin. You do not have to take the platform's word for it, and neither does anyone you later sell the coin to — the same page that shows a coin's provenance shows the draw that placed it in your cabinet.

## 5. Before you open one

You must be 18 or older, and you confirm this once, the first time you open a strike. The price is the price of one pull; the vault fee comes out of the issuing house's side, as it does on a drop, and vault storage is included. The odds on the case are the odds — no design is more likely because of who you are or how many times you have pulled. Treat a sealed strike as what it is: a way to acquire one real coin from a small, disclosed pool, and never as a way to make money. Coins are collectibles; their future value is nobody's promise.

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Read it on Bifrost — https://bifrostvault.io/learn/sealed-strike