Ardor accounts can be configured to have all their transactions require approval by other accounts, defined in a whitelist, thus making them multi-signature accounts. Even more flexible control can be achieved by requiring transactions to be approved for example by voting based on number of asset shares (e.g. shareholders voting on the company spending), or any of the voting models supported on the Ardor blockchain. Configuring account control must be done on the Ignis child chain, but once set it applies to all account transactions regardless of the chain.
Multi-Signature Accounts is a feature on the public blockchain Ignis and available to all child chains on the Ardor Platform