🏆Prize pool

How does on-chain randomness work in Gacha Card?

We leverage Proof of Play for Provably Fair outcomes

1. Generating a Cryptographically Secure Seed

When a user opens a Gacha Card:

• A request is sent to Proof of Play, a decentralized oracle, to generate a cryptographically secure random seed.

• This seed (a unique, verifiable string of data) serves as the foundation for all subsequent randomness in the process.

1. Deterministic Prize Selection

The seed is processed through a deterministic algorithm to derive three distinct random values, each governing a critical component of the outcome:

Value 1: Pool Selection

• Output: A binary result (1 or 2).

• Function:

  • 1: Prize is allocated from the ETH Pool (primary rewards) with 70% chance

  • 2: Prize is allocated from the Meme Coin Pool (eg. $PENGU) with 30% chance

On each Gacha Card, you have the winning symbol on top of the scratch area. That indicates which prize pool you are winning from

Value 2: Tier Assignment

• Output: An integer between 1 and 6 mapped to a predefined probability distribution.

• Tier Structure for Community Card (~$6.5):

  Tier	# of symbol on the card	Prizes as % of the pool	Win Rate
  1	1	0.13%	35.4%
  2	2	0.14%	37.2%
  3	3	0.5%	33.93%
  4	4	0.6%	36.35%
  5	6	0.7%	36.351%
  6	8	15.0%	0.06%

• Tier Structure for Gacha mini ($1.5):

  Tier	# of symbol on the card	Prizes as % of the pool	Win Rate
  1	1	0.03%	35.4%
  2	2	0.04%	37.2%
  3	3	0.12%	33.93%
  4	4	0.14%	36.35%
  5	6	0.17%	36.351%
  6	8	3.65%	0.06%

Value 3: Win Validation

• Output: A float between 0.00 and 100.00 (2 decimal places)

• Validation Logic: The float is compared to the win rate of the assigned tier

• Win Condition: Float ≤ Tier win rate → Prize awarded

  • Example with $10 card:

    • Tier 6 (0.5% threshold): A float of 0.50 → Win. 0.51 → Loss

    • Tier 1 (35.4% threshold): A float of 10.00 → Win; 35.5→ Loss