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See attestation.txt in this directory for Chih-Cheng Liang's signed attestation.

Hash of the challenge file for verification:

    e406add7 6da9abd4 d2bd81b3 e6fbf721
    3fdeb18d 3a3b8b3e c35a0a0d c04bcc19
    c7c94362 8bdc1f9c 974a6053 2f5fe053
    fc53a956 a11f0b40 990cc734 f0d496d1

response was based on the hash:

    e406add7 6da9abd4 d2bd81b3 e6fbf721
    3fdeb18d 3a3b8b3e c35a0a0d c04bcc19
    c7c94362 8bdc1f9c 974a6053 2f5fe053
    fc53a956 a11f0b40 990cc734 f0d496d1

Hash of the response file for verification:

    e51f44c2 c3d398d4 fcc3cbae 3a63b449
    dcfe2aef baab3ad5 a8c7a782 23abd337
    fb30b676 31caa2f9 af515317 945d5c5e
    80cf7197 1777af17 072e3ed2 dc6c1d9b

Blake2b hash of the new_challenge file for participant #38:

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

The above new_challenge file: https://ppot.blob.core.windows.net/public/challenge_0038

Chih-Cheng's attestation:

Attestation to response 0037

Date: Thu May 14 2020 - Fri May 15 2020 Name: Chih-Cheng Liang Location: Taipei, Taiwan Device: Personal MacBook Pro with MacOS Mojave 10.14.6 Commit Hash: bf852c168676a7afc5dd17b47ff9b8f394aeab8a Challenge: URL: https://ppotus.blob.core.windows.net/public/challenge\_0037

`challenge` file contains decompressed points and has a hash:
        e406add7 6da9abd4 d2bd81b3 e6fbf721 
        3fdeb18d 3a3b8b3e c35a0a0d c04bcc19 
        c7c94362 8bdc1f9c 974a6053 2f5fe053 
        fc53a956 a11f0b40 990cc734 f0d496d1 
`challenge` file claims (!!! Must not be blindly trusted) that it was based on the original contribution with a hash:
        3b3630a0 e4fa0ef1 4e1086d8 60cae23a 
        fa635c65 cae2971e 702a7ccc f13e3820 
        5507dc4a 9cfdd8f1 481fac94 0ef1bd01 
        46e73740 66d1493d 1114f328 73eb6f27

Response:

The BLAKE2b hash of `./response` is:
        e51f44c2 c3d398d4 fcc3cbae 3a63b449 
        dcfe2aef baab3ad5 a8c7a782 23abd337 
        fb30b676 31caa2f9 af515317 945d5c5e 
        80cf7197 1777af17 072e3ed2 dc6c1d9b

Time taken Download: 11:26:47 hour(s) to download Execution: about 20 hours Upload: about 22 hours

Entropy Sources: keys smashing

Side channel defences: turn off internet connection Postprocessing: Rebooted the machine

Note: Before the successful computation documented above, I had a failed one using old Ubuntu 14.04 computer. The fail is caused by a bus error of a portable hard drive.