TON smart contract lottery 3 of 13

alfacoder · 26 Дек 2019

Smart contract lottery 3 of 13 for Telegram Open Network

Lottery rules:

participants choose 3 arbitrary unique numbers 0-99 and "buys" a ticket
prize fund of current round is a sum of all "sold" tickets in this round, plus "unused" fund from previos round, minus round commision
sponsors can increase current round prize fund by any amount of GR$
owner of lottery smc conducts a lottery round (say once per day):
- generate 13 unique random numbers 0-99
- find winners and their prize among participants:
  - guess all 3 numbers - 60% of prize fund / winners
  - guess 2 numbers - 22% of prize fund / winners
  - guess 1 number - 15% of prize fund / winners
- charge smc commision - 3% of prize fund
- "fills" previous round, "zeros" current round
results of previous round can be fetched with lucky_nums, winners and is_winner methods
winners of previous round can withdraw their prizes
owner of lottery smc can withdraw only commision, not the entire smc balance

Current limitations:

participant's accounts must reside in basechain (wc = 0)
participant can buy only 1 ticker per round
withdraw of previous round prizes needs to be done during the current ongoing round

As an owner of lottery smc you can:

As an participant of lottery you can:

buy a ticket with 3 numbers 0-99 for 1 Gram by sending transfer from your wallet account with message payload generated by lotto-buy.fif, or by sending your numbers in comment of simple transfer message
sponsor current lottery round with some Grams by sendidng transfer from your wallet account with message payload generated by lotto-sponsor.fif
withdraw your prize by sending "get"-transfer from your wallet account with message payload generated by lotto-withdraw.fif