The xDai Stable Chain is protected by a select group of validators well known in the Ethereum space. For a complete and updated list, visit https://validators.poa.network/poa-dapps-validators and set the network at the top to the xDai chain.
To learn more about the Validators, visit our forum section where validators introduce themselves and explain why they want to validate the chain.
When xDai switches to public POSDAO, anyone with enough STAKE and the ability to run a node can become a candidate. Candidates will be eligible to become validators in the new model.