Verifiable Loot Systems

Relying on JavaScript Math.random() to generate gaming loot exposes your game economy to trivial exploit vectors by clients simulating mempools to guarantee rare drops.

PyVax natively supports Chainlink VRF (Verifiable Random Function) abstraction for bulletproof cryptographic randomness directly within your Python class.

The VRF Architecture

python

from pyvax import Contract, network

# Standard lookup map defining Item Rarity Thresholds
LOOT_TABLE = {
    "COMMON": [1, 50],       # 50% chance
    "UNCOMMON": [51, 85],    # 35% chance 
    "RARE": [86, 98],        # 13% chance
    "LEGENDARY": [99, 100]   # 2% chance
}

class LootBox(Contract):
    
    @action
    def open_loot(self, player: address):
        """Processes a cryptographically secure RNG request natively"""
        
        # Internally blocks execution until the VRF Coordinator fulfills
        # the asynchronous callback mapped by PyVax
        rng_value = self.chainlink_vrf(max_value=100) 
        
        item_rarity = self._determine_rarity(rng_value)
        
        # Trigger an ERC1155 mint directly to the player's wallet
        self._mint(player, item_rarity, 1)

    # Note: Lacks a decorator, compiles to an Internal Solidity function!
    def _determine_rarity(self, rng: int) -> int:
        for rarity, (low, high) in LOOT_TABLE.items():
            if low <= rng <= high:
                return rarity

VRF Funding & Subscriptions

Chainlink VRF requires LINK token to fund the asynchronous oracle callbacks.

When you deploy a PyVax contract containing the self.chainlink_vrf() method call, the CLI will natively detect the dependency and prompt you to mapped a pre-funded Subscription ID against the Fuji or C-Chain network targets.

bash

$ pyvax deploy vault.py --network fuji
# Dependency detected: VRF Coordinator
# 
# Please enter your Chainlink Subscription ID: 
> 8492
# 
# Binding VRF dependencies... Deploying.

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