When you download Node Client install file from github https://github.com/SmartCash/Core-Smart/releases/
You want to make sure the file downloaded are authentic ?
1. Use online tool
https://emn178.github.io/online-tools/sha256_checksum.html
2. Use Command Line
Calculate SHA-256 checksum
shasum -a 256 smartcash-1.2.4-osx.dmg