I need to check on some checksums to confirm if the duration matched the setting (which we had set at 90 days but mysteriously was showing as '7' again when i went to check the Misc. settings. Can anyone tell me which table the data is in?

Should this find it for me - if so I guess the field has an unrelated name

    AND TABLE_SCHEMA='<my-database>';

1 Answer 1


The checksum is not stored in the database, have a look at CRM_Contact_BAO_Contact_Utils more specifically at the methods generateChecksum and validChecksum.

The genereateChecksum method returns the checksum like $checksum_$timestamt_$life the life is in hours, so for a given checksum you could tell when was generated and what was is expire date.

The validChecksum method takes the $contact_id and a $checksum And validates it. This method is called when a profile/contribution/event/etc page is rendered and is taken from the requested URL.

  • Andrei - thank you very much. do you know does this mean if there is a way that i can investigate whether a specific checksum that was sent out had a 7 day or a 90 day life
    – petednz - fuzion
    May 31, 2016 at 19:30
  • If you know the actual checksum yes, the last bit (after the second _ underscore) is the lifetime of that checksum in hours, ie cs=a135dc716e4e859155cf1123c11bcc27_1464650985_168 168 / 24 hours = 7 days
    – Andrei
    May 31, 2016 at 19:36

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