| ALPUN | The Alpaca Universe SPL token on Solana — the only fungible on-chain asset. |
| Alpaca Energy | Daily off-chain action allowance, derived from base energy plus staking bonus. |
| alpun | Short project name for Alpaca Universe (alpun.io). |
| Entitlement | A MongoDB record stating a player has earned an NFT and may claim it (earned → claimable → claiming → claimed). |
| Founders Farm | The Season 0 map: six parcels restored left to right. |
| Idempotency key | Unique string attached to every crediting operation so it can never apply twice. |
| Indexer | The alpun-indexer deployable that watches Solana and updates MongoDB projections. |
| MPL Core | Metaplex's NFT standard used for the Season 0 collection. |
| Outbox | Events written in the same MongoDB transaction as state changes, delivered asynchronously afterwards. |
| Parcel | One of six 8×24-tile sections of the Founders Farm. |
| PDA | Program Derived Address — Solana accounts owned by the staking program (reward vault, positions). |
| Productive Farm Time | Actively-managed play time; the eligibility clock for NFT tiers (max 4h per rolling 24h). |
| Projection | An off-chain copy of on-chain state (e.g. staking_positions), updated by the indexer, never authoritative. |
| Season | A fixed period with its own reward pool, leaderboard and NFT collection. |