Yes, you should be able to borrow tzBTC using SIRS. You can use SIRS to borrow tzBTC by depositing your collateral, such as tzBTC, into a smart contract. The smart contract will then issue you a loan in tzBTC based on the amount of collateral you have deposited. This loan can then be used to purchase tzBTC, or to pay for goods and services. To ensure that you are able to repay the loan, the smart contract will also require you to pay a certain amount of interest on the loan. Once the loan is repaid, the collateral will be returned to you.
