"ICANN (not the domain registrar) requires that all information in your registration be valid.
If any dispute arises (see the ICANN Uniform Domain Name Dispute Resolution Policy rules here) you will be contacted via the means specified in your domain registration. Notice that section 14 of the rules is a section that defines what happens as part of a 'default' (in other words, they can't contact you): They'll proceed with a judgement, and you won't get a say in the proceedings.
ICANN has the power to take a domain from you and give it to somebody else.
So yes, it's important that you include valid information in your registration information."
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