[{"type":"report","id":"BLC-STUDY-1333","title":"Addition of CALLDEPTH opcode","author":[{"literal":"Martin Holst Swende"}],"issued":{"date-parts":[[2015]]},"publisher":"Martin Holst Swende","URL":"https://github.com/ethereum/EIPs/blob/master/EIPS/eip-3.md","note":"Rights status: Licensed for redistribution. Not a licence to republish the paper."}]