You do not need to attach or provide any extra documentation to prove that you made a contribution to your Traditional IRA. The financial institution that is the custodian over your account will report the contribution to the IRS and you will receive a copy of Form 5498 later in the year for your records.
You need to report the contribution on your tax return by going through the Deductions and Credits > Retirement and Investments > Traditional and Roth IRA Contributions section of your return.
See the following TurboTax help article for more details:
Where do I enter my traditional or Roth IRA contributions?
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