thank you
does HVC have ACP or other active checkpointing mechanisms?
I don't know about any other checkpointing mechanisms, but dev mentioned checkpoint once in update, over a year ago:
Development updateHeavycoin version 1.3 has been released! This version contains payment protocol support, a few minor updates and a checkpoint.
Changelog- Payment protocol support for heavycoin: URIs
- Added checkpoint at height 60,000
- Minor UI fix