- requestType is getECBlock
- timestamp is the timestamp (in seconds since the genesis block) of the EC block (optional, default (or zero) is the current timestamp)
- requireBlock is the block ID of a block that must be present in the blockchain during execution (optional)
- requireLastBlock is the block ID of a block that must be last in the blockchain during execution (optional)
Note: If timestamp is more than 15 seconds before the timestamp of the last block on the blockchain, errorCode 4 is returned.