Horizen's sidechain model is designed to be completely decentralized without the need to rely on pre-defined trusted parties.
Listen to our Director of Engineering, Alberto Garoffolo explain at BlockchainUA 2019 (https://blockchainua.com) how we will be able to support other platforms over Horizen Sidechains and integrate 3rd party technologies.
Presentation by the link: https://drive.google.com/file/d/1fJgy9CokZwCelUvRvMQDB5LFJRDOcl5G/view
Horizen Website – https://www.horizen.global