Signature Checksum Service

Generate and verify secure daily signature codes using SHA-256 based checksums

Your Secret PIN

No PIN saved. Enter a 4-digit PIN to get started.
Current Date (IST)
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Generate Today's Code

Generate a unique 4-digit signature code for today using your saved PIN. This code is valid only for the current date.

Your Signature Code for Today
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Verify a Code

Enter the date and signature code to verify. You can verify codes from past dates but not future dates.

Valid Code

The signature code is valid.

How It Works

  • Your 4-digit PIN is stored locally in your browser
  • The signature code is generated using the current date + your PIN + a server-side secret key
  • SHA-256 hash ensures the code cannot be reverse-engineered
  • Each day generates a unique code that cannot be backdated
  • Verification confirms the code was generated with the correct PIN on the specified date