Digital records system - secure measure supporting bursar principally (10)

I believe the answer is:

blockchain

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'supporting bursar principally' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'digital records system secure measure' is the wordplay.
'digital records system' becomes 'b' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'secure' becomes 'lock' (locking is a kind of securing).
'measure' becomes 'chain' (unit equal to 22 yards).
'b'+'lock'+'chain'='BLOCKCHAIN'

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