PowerPick — Protocol Whitepaper

Last updated: 2025-07-28

PowerPick is an on-chain lottery system that issues soulbound (non‑transferable) ERC‑721 tickets, accepts payment in USDT or $PLAY(vide LuxPlay Whitepaper for more details!), draws numbers with Chainlink VRF v2.5, tallies winners combinatorially (system picks), and distributes prize pools on-chain. It also includes Chainlink Automation hooks for closing rounds, tallying, and finalization.

Key ideas

• System tickets: A ticket can select k numbers (6 ≤ k ≤ 15). Its effective 6-number entries are (\binom{k}{6}) (“combos”).

• Combinatorial winners: For a ticket with k picks and m matches against the 6 drawn numbers, winners are counted per tier as:

  • 6 hits: (\binom{m}{6})

  • 5 hits: (\binom{m}{5} \cdot \binom{k-m}{1})

  • 4 hits: (\binom{m}{4} \cdot \binom{k-m}{2})

  • 3 hits: (\binom{m}{3} \cdot \binom{k-m}{3})

• Pools and payouts: 50% of ticket cost goes to prize pools, split by tier (default 40/30/20/10). Each tier is split equally among its combinatorial winners.

• Carryovers: Leftover dust and tiers with zero winners roll into carryover (6-hit pool of next round). There’s also a yearly pool fed by authorized deposits.

• Soulbound tickets: Non-transferable ERC‑721 to simplify accounting and avoid secondary trading.

• Static tokenURI: One static metadata URI for all tickets

See the sidebar for details.