Entry validation ensures lottery participants meet eligibility requirements before accepting their ticket purchases. Smart contracts enforce these checks automatically through programmed criteria examining wallet states, transaction details, and submission timing. https://crypto.games/lottery/ethereum implements multi-layer validation, preventing invalid entries from cluttering draw pools. The automated verification happens instantly without manual review queues. Rejected entries bounce back with specific error messages explaining failure reasons.
Wallet balance verification
Smart contracts check that sufficient funds exist before accepting lottery entries. Your wallet must contain the ticket price plus estimated gas fees for transaction completion. Insufficient balance triggers immediate rejection without processing the entry attempt. The validation happens before any blockchain state changes occur, preventing partial transactions that consume gas without delivering tickets.
Balance checks account for pending transactions that might deplete available funds between submission and confirmation. A wallet showing 0.5 ETH with a pending 0.4 ETH transfer elsewhere has only 0.1 ETH truly available. Advanced validation logic queries pending transaction data from the mempool, calculating actual spendable amounts rather than displayed balances alone. This prevents acceptance of entries that will fail during settlement when pending transactions confirm first. Some platforms implement reserve requirements demanding balances exceed ticket prices by specific margins, ensuring gas fee coverage remains adequate even during network congestion spikes.
Duplicate entry detection
Preventing multiple entries from single wallets requires tracking which addresses have already participated:
- Contract storage maintains lists of participant wallet addresses per draw
- New entry attempts trigger lookup operations, checking existing participant records
- Matching addresses get flagged and rejected with duplicate entry error messages
- The restriction resets after each draw completes, allowing fresh participation
- Some platforms permit multiple entries by checking unique transaction hashes instead
The duplicate prevention strategy depends on platform rules regarding entry limits. Single-entry lotteries strictly enforce one ticket per wallet. Multi-entry formats allow repeated participation but might cap total entries from individual addresses, preventing whale domination. The validation logic adapts based on configured parameters within the smart contract deployment.
Timing window compliance
Lottery draws operate on scheduled timelines with defined entry periods. Smart contracts validate that submission timestamps fall within acceptable windows. Attempts arriving before the entry opening get rejected as premature. Submissions after closing time bounce back as late entries. The timing validation uses blockchain timestamps from transaction blocks rather than user-provided time data, preventing manipulation.
Entry windows typically span hours or days, depending on lottery format and target participation levels. Daily draws might accept entries for 23-hour windows before closing one hour pre-draw for processing. Weekly formats could run six-day entry periods. The contract compares the current block timestamp against the stored opening and closing times. Entries landing outside these bounds fail validation instantly. Network congestion occasionally causes transactions to confirm after intended submission times. Players submitting just before deadlines risk rejection if confirmation delays push them past the cutoff moments.
Number selection validity
Player-chosen number combinations require validation against lottery format rules. Pick-six lotteries need exactly six distinct numbers within specified ranges. Contracts verify that submission data contains the correct quantity of selections without duplicates. Number ranges get checked, ensuring all selections fall between defined minimums and maximums. A lottery spanning numbers 1-49 rejects entries containing 0 or 50. Format-specific validation catches common submission errors. Sequential number requirements verify selections appear in specified orders. Bonus number systems check main selections, and bonus picks occupy separate categories without overlap. The validation prevents formatting mistakes that would render entries invalid during draw processing. Clear error messages indicate which validation criteria failed, letting players correct and resubmit properly formatted entries.