Yes. But a more natural word here than 'attestation' is 'proof'. Is this what you mean?
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CliveOr do you mean something less than proof?I think I use the word "attestation" here as a substitute for "testimony"
avid learnerI think I use the word "attestation" here as a substitute for "testimony"Technically I suppose "attestation" is correct but no native speaker would ever use it in this context. In fact I had to look it up to verify that it's actually a word.