[Bug] `findUnspentRecords` should not use request failure to check unspent record

## 🐛 Bug Report
`findUnspentRecords` currently calls the `getTransactionId` API and, upon failure, assumes that the record is unspent. Using an unspecified catch block to handle core logic is an anti-pattern. The API errors can happen for unknown reasons, which would lead to false positives. 