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See alex_attestation.txt in this directory for Alex Skidanov's signed attestation.

Hash of the challenge file for verification:

    10bdaa12 81af4408 8d52f74e a0a68574
    10c43fda cf11a54b 123c14e9 90501cbc
    91267417 db60661e bf911d30 bd800684
    e2ce8ddc c3ee68c0 e37640fa 22553b98

response was based on the hash:

    10bdaa12 81af4408 8d52f74e a0a68574
    10c43fda cf11a54b 123c14e9 90501cbc
    91267417 db60661e bf911d30 bd800684
    e2ce8ddc c3ee68c0 e37640fa 22553b98

Hash of the response file for verification:

    379ecd36 fd2650c0 2196c9b4 13ea0f28
    2d5545c9 ed270075 fd5b5000 60a41e67
    8d5b75fc b22221b4 2636b741 0c45d9a1
    68a4bf12 a6e91efc 14e09be2 20780990

Blake2b hash of the new_challenge file for participant #28:

    f71e9315 058c1c88 ba4cd22e 01f86242
    d81b5e74 de829ad8 8bd7ecef 475ca3ce
    d59eaa77 7e2ebfd3 14c38bde 84a47ebf
    c3143252 9c978b84 b25cddf7 a6212371

The above new_challenge file: https://ppot.blob.core.windows.net/public/challenge_0028

Alex's attestation:

Attestation to response 0027
----------------------------

*Date*: Thu Mar 19 2020 - Sat Mar 21 2020
*Name*: Alexander Skidanov
*Location*: Emeryville, CA
*Device*: Personal Lenovo Carbon X1 with Ubuntu 18.04
*Commit Hash*: bf852c168676a7afc5dd17b47ff9b8f394aeab8a
*Challenge*:
URL: https://ppotus.blob.core.windows.net/public/challenge\_0027

challenge file contains decompressed points and has a hash: 10bdaa12 81af4408 8d52f74e a0a68574 10c43fda cf11a54b 123c14e9 90501cbc 91267417 db60661e bf911d30 bd800684 e2ce8ddc c3ee68c0 e37640fa 22553b98 challenge file claims (!!! Must not be blindly trusted) that it was based on the original contribution with a hash: 0eb5712a f476dd2f b5fe6419 9eb269f9 e945c281 71d09687 f373a02a 11f53cbd c3df2fc9 77529e2f 9a51c428 4547f6df e49eb1aa 3a46c508 27566b0b ac5fa5af


*Response*:

The BLAKE2b hash of ./response is: 379ecd36 fd2650c0 2196c9b4 13ea0f28 2d5545c9 ed270075 fd5b5000 60a41e67 8d5b75fc b22221b4 2636b741 0c45d9a1 68a4bf12 a6e91efc 14e09be2 20780990


*Time taken* 
Download: 2:08 to download
Execution:

real 1111m12.999s user 8579m57.340s sys 5m45.605s

Upload: 19 hours

*Entropy Sources*:
Latest Ethereum and Bitcoin hashes, numbers from random.org, /dev/urandom, some keys smashing

*Side channel defences*: None
*Postprocessing*: 
Rebooted the machine