A childchain is a scalable blockchain that is anchored to Ethereum on the OMG Foundation. OMG’s scaling solution improves the Ethereum network’s speed by moving transactions away from the Ethereum mainchain and onto childchains. The childchain does not store user funds and is secured by the Ethereum blockchain and a decentralized network of watchers. Sidechains have their own security mechanisms and custody of users’ funds, whereas childchains do not.