Add augurrank-btc-fork.clar #1
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A Stacks smart contract stores user BTC price prediction and verifies accuracy with an AMM pool.
This smart contract is for a prediction game. The game lets users predict whether BTC prices will increase or decrease in the following 100 Bitcoin blocks (approximately 16 hours). After 100 Bitcoin blocks, admin calls verify with the correct Stacks block height without needing to provide BTC prices, as BTC prices can be retrieved from ALEX AMM pools with the at-block function.
AFAIK, currently, there is no way to get Bitcoin block height from Stacks block height and vice versa. Getting Bitcoin block height in the at-block function still returns the latest height. That's why verify can be called by admin only. At least the verified result is transparent, and the admin can re-verify with the correct Stacks block height.
After #1615 is fixed, verify will be more robust and can be called by anyone.