checkZkappTransaction
function checkZkappTransaction(transactionHash: string, blockLength: number): Promise<{
  "failureReason": string[][][];
  "success": false;
 } | {
  "failureReason": null;
  "success": true;
}>
Parameters
• transactionHash: string
• blockLength: number= 20
Returns
Promise\<{
"failureReason": string[][][];
"success": false;
} | {
"failureReason": null;
"success": true;
}>