post https://ethereum.nirvanalabs.xyz/
Returns the account and storage values of the specified account including the Merkle-proof
Parameters
address: The address of the account for which the balance is to be checked
storageKeys: An array of storage-keys that should be proofed and included
blockNumber: The block number as a string in hexadecimal format or tags.
Returns
address, accountProof, balance, codeHash, nonce, storageHash, storageProof