Can I swap an ERC-20 token with a Neo NEP5 token using a smart contract

Question

I am trying to understand how to swap tokens between blockchains, if its possible.

I have a smart contract in ETH that issue a token (ABC) as ERC-20 token.

I have a smart contract in NEO that issue a token (ABC) as NEP5 token.

How can I consolidate them in one blockchain? (all in ETH or all in NEO?)

Answer 1

Every Blockchain has a separate administration. So, it is not possible to swap tokens on-chain as you would need the first chain to rely on stuff that happens on another chain. To do it when really necessary, you would need a third party that guarantees that the exchange happens correctly.

Neo is unique in that it describes a mechanism in which off chain assets can be exchanged atomically, which is referred to in their whitepaper as "NeoX". Ontology is a collection of protocols of wich part is a implementation of the NeoX concept.