On $BTC options flow, call buys were $2.91M, put buys were $518K, and block trades made up 0.68 of the flow, with the largest buy a $4.00M call block at 70000 expiring 30OCT26. It is measured by recorded call and put buy premium, plus the block share and the largest block print. It shows where options premium concentrated, but it is a flow reading and not a directional signal.