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See jameszaki_attestation.md in this directory for James Zaki's signed attestation.

Hash of the challenge file for verification:

    8d77dba2 eada39e2 2a75a8ad 8c0f40f8
    0dcefa59 4c6a89ea 28f448df 8bced1b5
    3ee80e03 9247d88f 9efb734e cbaf9245
    badd9177 5e8b1dd6 07725db7 facf734b

response was based on the hash:

    8d77dba2 eada39e2 2a75a8ad 8c0f40f8
    0dcefa59 4c6a89ea 28f448df 8bced1b5
    3ee80e03 9247d88f 9efb734e cbaf9245
    badd9177 5e8b1dd6 07725db7 facf734b

Hash of the response file for verification:

    036438ed c68d3a36 6ba0517f 5b4a0e79
    f6d5efe5 6fd2514a bb674c9d f6126eda
    854fd11b eb274969 095149d7 7de76179
    45176503 158beaf9 fc6f9fa5 9aef2aaf

Blake2b hash of the new_challenge file for participant #39:

    ac95544f 0e1eab30 0cbd826c 7ce0ccf5
    58559b95 cf450ed1 0f472063 fa50bb5e
    159734c0 a50cdd1a 8413eb92 a7b4947e
    6e66b8d0 cdb3a19c 85897e42 ee1811e1

The above new_challenge file: https://ppot.blob.core.windows.net/public/challenge_0039

James Zaki's attestation:

Attestation to response 0038

Date: Fri May 22 2020 - Sat May 23 2020 Name: James Zaki Location: Sydney, NSW, Australia Device: MacBook Pro (Retina, Mid 2012) with macOS Catalina 10.15.3 Commit Hash: bf852c168676a7afc5dd17b47ff9b8f394aeab8a Challenge: URL: https://ppotau.blob.core.windows.net/public/challenge_0038

`challenge` file contains decompressed points and has a hash:
        8d77dba2 eada39e2 2a75a8ad 8c0f40f8 
        0dcefa59 4c6a89ea 28f448df 8bced1b5 
        3ee80e03 9247d88f 9efb734e cbaf9245 
        badd9177 5e8b1dd6 07725db7 facf734b 
`challenge` file claims (!!! Must not be blindly trusted) that it was based on the original contribution with a hash:
        e51f44c2 c3d398d4 fcc3cbae 3a63b449 
        dcfe2aef baab3ad5 a8c7a782 23abd337 
        fb30b676 31caa2f9 af515317 945d5c5e 
        80cf7197 1777af17 072e3ed2 dc6c1d9b

Response:

The BLAKE2b hash of `./response` is:
        036438ed c68d3a36 6ba0517f 5b4a0e79 
        f6d5efe5 6fd2514a bb674c9d f6126eda 
        854fd11b eb274969 095149d7 7de76179 
        45176503 158beaf9 fc6f9fa5 9aef2aaf

Time taken Download: ~1hr to download Execution: <26hrs (not timed) Upload: ~30mins

Entropy Sources: Hundreds of random keystrokes.

Side channel defences: Disconnected network between download of the challenge and upload of the response. No one outside of ppot knew I was doing it until already calculating.

Postprocessing: Rebooted the machine.