BAKER NODE: Block production is a necessity for the blockchain to manage state and for the node operators to earn fees. Where the actual computations are simple, it poses requirements for backup. While the basic role as block producing node, does not involve the handling of confidential information, Baker Nodes are involved in a large-scale threshold signature scheme, which requires backup of secret variables. Incentives: All node operators involved in achieving consensus are expected to operate a Baker Node and as such are required to stake MPC Tokens. The payment as Baker Node is the basic earning as node operator.

ZK NODE: Executing the ZK computations is significantly more involved than operating a Baker Node. These executions will saturate the network on the server and require backup of the secret variables and significant SLA requirements on the servers during the lifetime of a ZK computation. A ZK node holds the secret state of the ongoing computations and collusion among t+1 of the involved ZK nodes can leak the secrets. t is set by the chosen security model and t+1 may potentially involve all of the involved ZK nodes. A number of mechanisms will be introduced to counteract collusive behavior such as additional staking and a market that allows the users of the Partisia Blockchain to select ZK nodes. Incentives: The ZK nodes are required to further stake MPC Tokens beyond those required for participation as Baker Nodes to enter the market for ZK computation. The payment received by ZK node is additional earning to that received as a Baker node operator.

ORACLE NODE: Maintaining the secret state for the cross chain wallets requires monitoring the states of the governing smart contracts on both chains and reacting accordingly. These reactions all involve moving funds to and from the wallets. All the nodes involved in running the oracles hold a part of the key to the wallet. It is very easy to
prove that a wallet has been misused - since every transaction not authorised through the smart contract is malicious. Hereby, constraints on the funds controlled by the individual node operators will be defined by a function with the amount of MPC Tokens staked and the liability towards the users of the Oracle as input. Incentives: Nodes running the Oracle are required to further stake MPC Tokens. The payment for operating the Oracle is set by the Partisia Blockchain. The payment from operating the Oracle is in addition to earnings as a node operator.