Which # file this block is stored in (blk?????.dat)
Declared in <chain.h>
[[guarded_by(0x7ff36cbf25d0), guarded_by(0x7ff379204b10), guarded_by(0x7ff39283aaf0), guarded_by(0x7ff383368e10), guarded_by(0x7ff38bd20970), guarded_by(0x7ff392c20830), guarded_by(0x7ff36c161440), guarded_by(0x7ff381ccef90), guarded_by(0x7ff38d75bfe0), guarded_by(0x7ff36872cc90), guarded_by(0x7ff3743a69d0)]]
int nFile = {0};