question about transactionKey format in cancel

I need to find a way to separate between 「transactionKey of a cancel record」 and 「the order id from my side.

Example id from my side: ARYAeLMaTLw1wUzlhrxsUjlhq1k7
Example transactionKey: txrd_a01jvmywd0rje50zwmvag5twhbv

I observe that transactionKey from toss always has prefix "txrd_", so don't know if this is a hard-coded prefix for both test environment and online environment?
If this is the case, it would make the separation logic much easier.
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