The Red Belly Blockchain is unforkable. By contrast, mainstream blockchains tolerate that multiple blocks be appended at the same index of the blockchain, hence causing what are known as forks. To prevent an attacker from exploiting these forks and double spending in two of these blocks, these blockchains try to prune out these forks. Unlike curing of the forks, the Red Belly Blockchain prevents them: the consensus among the participants occurs before a new block is added, so that the blockchain remains a "chain".