Sidechain
Fleeting- External reference: https://hackernoon.com/what-are-sidechains-1c45ea2daf3
What are Sidechains? | Hacker Noon
A sidechain is a separate blockchain that is attached to its parent blockchain using a two-way peg. The two-way peg enables interchangeability of assets at a predetermined rate between the parent blockchain and the sidechain. The original blockchain is usually referred to as the ‘main chain’ and all additional blockchains are referred to as ‘sidechains’. The blockchain platform Ardor refers to its sidechains as ‘childchains’.