Guardia Civil warning about the ID number banks won't accept

Spain's Guardia Civil advises covering the DNI support number, but banks and crypto exchanges demand to see everything. The clash between security and paperwork.

English · Original discussion in Spanish · Published

Covering the DNI support number: the advice the banking sector rejects

Sending a copy of your Spanish national ID card (DNI) has become a routine task. The Guardia Civil has issued an alert with precise instructions: black-and-white copy, support number covered, and an additional note preventing the image from being reused. The advice sounds like common sense, but applying it reveals a problem: many institutions demand the document exactly the opposite way.

The support number is the code that identifies the document. In theory, covering it prevents third parties from using it for fraudulent procedures. The reality is rougher: on the DNI itself, that number is visible through the side window, so covering it in one place guarantees nothing. And on top of that, banks, Spain's tax agency (Hacienda) and cryptocurrency exchange platforms reject altered copies. In practice, several people who trinc the advice found their bank rejecting the edited copy. Others confirm that exchanges require the full document to complete identity verification.

The Guardia Civil's warning aims to protect citizens, but it runs into the real-world practice of institutions that demand to see everything. A deeper question remains: if the support number is so sensitive, why can't it be hidden in official procedures? Nobody offers a clear answer.

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Summary of a discussion on Burbuja.info - Foro de economía, actualidad y política., translated from Spanish and reviewed before publication. Read the full discussion (20 replies).

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