Archive-Gateway: This is a heavy-duty full-node with API support: it stores a full copy of the blockchain, the status of all accounts, and the accounts index database so that it can serve as a Consensus Delegate, securely verifying any new incoming transaction against the actual status of the ledger. Additionally, it can serve as a Gateway for communication with the blockchain, supporting API queries of account and contract states, both on current block height and any past block height. [Archive nodes will be available from release 1.2 of the blockchain]