Auctus, a startup company that’s aiming to build a platform for blockchain-powered pension funds, is launching the presale for its initial coin offering Oct. 3.

It comes at a time when some of the largest retirement service companies are trying to tap blockchain technology because of its potential to increase efficiency in record keeping, document sharing, transaction settlements, contract execution, and business collaboration.

Blockchain is a real time distributed ledger system where every device in the network has a...