Is there a way to obtain account historical (for a given block) balance using catapult REST?
There is no such Rest API at this moment afaik.
My suggestion is to join the discord at start discussion around this with team: Official Symbol Discord Channel
Thank you, I will join discord. Is it possible to reconstruct balance from transactions 100% reliably? Is there a SDK code for that in any public repo? Or do I need an access to a node?
Each node exposing API:
There are also SDK available: