YES
You do need to prove your identity to:

Get a certificate (except historical certificates – see below)

Change a name

Register a relationship

Get married at the Victorian Marriage Registry

Correct an error on a certificate (except historical certificates)

Revoke a registered relationship

Change your recorded sex.
NO
You do not need to prove your identity to:

Get an historical certificate:
- Birth records over 100 years old
- Death records over 30 years old
- Marriage and relationship records over 60 years old

Register a new birth

Get a birth certificate when registering your baby's birth.
Next steps
Which identity documents can I use? Option 1