Permissioned blockchains are blockchains that require access to participate. In these blockchainAs a distributed ledger technology (DLT), a blockchain is a digital ledger that can create an immutable record of transactions.... Read More types, a control layer runs on top of the blockchain and governs the actions performed by the allowed participants. Permissioned blockchains use governance structures differently than private blockchains and public blockchains, employing different mechanisms for access controls (such as proof of identity) and digital signatures (such as multi-factor authenticationMulti-factor authentication is a security system employing more than one verification method from independent categories of credentials to grant access. Read More) to ensure only authorized participants can access the blockchain and all transactions are valid. A permissioned system (or network) is highly configured and controlled by the owners, restricting access and participation.