Crate btm 

A Recover Mechanism for Blockchain Scene

automatic operations:

• create a light-weight(COW) snapshot for each block
• clean up expired snapshots

Structs

BtmCfg

Configures of snapshot mgmt

Enums

SnapAlgo

Snapshot management algorithm

SnapMode

Inner Operations

Constants

CAP_MAX

Maximum number of snapshots that can be kept

STEP_CNT

itv.pow(i), only useful within the SnapAlgo::Fade algo

Functions

run_daemon

Run btm daemon ... server