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See attestation_0055.md in this directory for Tyler Blaise Smith's signed attestation.

Hash of the challenge file for verification:

    00d0b99a 5ccb65af a5872f82 5f2388f3
    2f6fd96e d1e58e83 cb921037 447d980d
    7bfb8a08 11d90a36 01846bbc ee2216ae
    aec90e60 e2490e5d 09ea36bf 3222840f

response was based on the hash:

    00d0b99a 5ccb65af a5872f82 5f2388f3
    2f6fd96e d1e58e83 cb921037 447d980d
    7bfb8a08 11d90a36 01846bbc ee2216ae
    aec90e60 e2490e5d 09ea36bf 3222840f

Hash of the response file for verification:

    d450e7ba c92588ec 64082588 1faec73d
    486557b6 bf01dc00 50aaf601 6b2f11bd
    83dfa598 a1c87790 84806ea1 b961118f
    198f490c bac5f452 35d6048b 920a6c0b

Blake2b hash of the new_challenge file for participant #56:

    48ef8f27 918a7ba3 559e6da1 c9dd2168
    3d076efb 012ce397 b348c83b bd89c207
    ae5d695f a20918e7 3bd86e36 9c861774
    afaf5c1a e35f24e6 36f7e066 fada8b64

The above new_challenge file: https://ppot.blob.core.windows.net/public/challenge_0056

Tyler Blaise Smith's attestation:

Attestation to response 0055

  • Date: Aug 28 - Aug 29 2020
  • Name: Tyler Blaise Smith (tcrypt)
  • Location: Santa Clara, CA
  • Device: MacBook Pro (16-inch, 2019), Tails 4.9 on Samsung flash drive
  • Software: phase2-bn254
  • Commit Hash: 988b668a396b1c417b23e31438854637fa434424
  • Challenge URL: https://ppotch.blob.core.windows.net/public/challenge_0055
`challenge` file contains decompressed points and has a hash:
                00d0b99a 5ccb65af a5872f82 5f2388f3
                2f6fd96e d1e58e83 cb921037 447d980d
                7bfb8a08 11d90a36 01846bbc ee2216ae
                aec90e60 e2490e5d 09ea36bf 3222840f
`challenge` file claims (!!! Must not be blindly trusted) that it was based on the original contribution with a hash:
                7f1229b8 321fd1b7 935dc9ca 5ebf1d16
                572f25c9 e936798d 3a2cfbbf 7b6c21d0
                8c681b03 6cded940 006dec27 0d51facf
                a1b24f27 698e98ba bd3555a4 6490fca7

Response:

The BLAKE2b hash of `./response` is:
                d450e7ba c92588ec 64082588 1faec73d
                486557b6 bf01dc00 50aaf601 6b2f11bd
                83dfa598 a1c87790 84806ea1 b961118f
                198f490c bac5f452 35d6048b 920a6c0b

Running time: ~12hrs

Entropy sources:

  • /dev/urandom
  • Ledger Nano S
  • Bitcoin, Bitcoin Cash, and Ethereum block hashes

Side channel defences:

  • No disk usage
  • Air-gapped machine

Postprocessing:

  • Tails' memory erasure
  • Destroyed Tails flash drive
  • Destroyed Ledger Nano S used to generate entropy