Signature verification failed android

1. What is a signature verification?
2. What does signature verification killer do?
3. How do I write a letter to bank for signature verification?

What is a signature verification?

“Signature verification” is the process of comparing the signature on a voter's affidavit envelope or ballot affidavit with the voter's signature in the voter registration database.

What does signature verification killer do?

APKKiller is a method to bypass various android application security system check such as Signature Verification, Integrity Check, etc. APKKiller uses JNI & Reflection to bypass Hidden API Restriction, however there is no guarantee that APKKiller will bypass all android application security.

How do I write a letter to bank for signature verification?

Dear Sir / Madam, I, Ch Subramanyam, maintaining savings account in your branch with account number 3212345687. I am writing this to request you to verify my signature so that I can use it for digital transactions. And please let me know if I need to submit any further information or documents to verify my signature.