hodl_vault.cash

pragma cashscript ^0.10.0;

// This contract forces HODLing until a certain price target has been reached
// A minimum block is provided to ensure that oracle price entries from before this block are disregarded
// i.e. when the BCH price was $1000 in the past, an oracle entry with the old block number and price can not be used.
// Instead, a message with a block number and price from after the minBlock needs to be passed.
// This contract serves as a simple example for checkDataSig-based contracts.
contract HodlVault(
    pubkey ownerPk,
    pubkey oraclePk,
    int minBlock,
    int priceTarget
) {
    function spend(sig ownerSig, datasig oracleSig, bytes oracleMessage) {
        // message: { blockHeight, price }
        bytes4 blockHeightBin, bytes4 priceBin = oracleMessage.split(4);
        int blockHeight = int(blockHeightBin);
        int price = int(priceBin);

        // Check that blockHeight is after minBlock and not in the future
        require(blockHeight >= minBlock);
        require(tx.time >= blockHeight);

        // Check that current price is at least priceTarget
        require(price >= priceTarget);

        // Handle necessary signature checks
        require(checkDataSig(oracleSig, oracleMessage, oraclePk));
        require(checkSig(ownerSig, ownerPk));
    }
}