Is there any usable decentralized DNS system right now? Such a system would not have to handle all the DNS resolutions, only those where the Domain owner think

Is there any usable decentralized DNS system right now? Such a system would not have to handle all the DNS resolutions, only those where the Domain owner thinks the Domain is beeing censored. He'd then inject the real Name/IP into the alternative system. The alternative DNS could be decentralized. It only has to make sure the list is not beeing tampered with. Like dnsmasq mutated with Bitcoin.