Sorry, no online dictionaries contain the exact phrase attest officially.
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Reverse dictionary results:
1. certify
 2. validate
3. authenticate
4. verify
5. endorse
6. answer for
7. answer to
8. ascertain
9. attest
10. attribute
 11. ok
12. vouch
13. voucher
14. able
15. acceptance
16. access
17. accommodation
18. acknowledge
19. acknowledgment
20. agree
 21. allowance
22. appraisal
23. apprise
24. approof
25. assent
26. assert
27. assessment
28. asseverate
29. aver
30. avouch
 31. confirm
32. congree
33. consense
34. credence
35. gree

You can look up the words in the phrase individually using these links:   attest ?   officially ?
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atte*to search for words beginning with atte, or
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