See zac_attestation.sig in this directory for Zac Williamson's signed attestation.
Hash of the challenge file for verification:
a7b3c130 cd8dbd26 769cfbcb e4c9a4ef
9055d13b ac932854 81c1007c acf51d29
c00dd146 d73a6670 47f65200 ae227e01
d589c609 04d263a4 1f5f187d 03fcc692
response was based on the hash:
a7b3c130 cd8dbd26 769cfbcb e4c9a4ef
9055d13b ac932854 81c1007c acf51d29
c00dd146 d73a6670 47f65200 ae227e01
d589c609 04d263a4 1f5f187d 03fcc692
Hash of the response file for verification:
fbb8512f 393ffd01 7c20b1b6 6f7f5cf2
05f1de39 4fa987a7 03dc3fc6 c3957613
b33e69a9 143ae272 cd3e02b1 4db3c5d4
24ab0695 27e3e813 2a7b7ecf 8bbd05df
Blake2b hash of the new_challenge file for participant #7:
3e1140e5 66971cbd e6308dc3 d3f2ef4e
2c36bb4d b16704ed 0ffd26ee 7d80ccce
f2b46aa4 6feadf3e 2da8c43e ccf7588a
09e6cd94 85a4dd05 20af752d b0f24128
The above new_challenge file: https://ppot.blob.core.windows.net/public/challenge_0007
Zac's attestation (from zac_attestation.txt):
Hello there,
I finished computing a response file for the sixth round of the powers of tau ceremony.
Date: 25-27 September 2019
Name: Zachary Williamson
Location: London, UK
Device(s): Surface pro 6, running Windows 10
Challenge hash:
a7b3c130 cd8dbd26 769cfbcb e4c9a4ef
9055d13b ac932854 81c1007c acf51d29
c00dd146 d73a6670 47f65200 ae227e01
d589c609 04d263a4 1f5f187d 03fcc692
Response hash:
fbb8512f 393ffd01 7c20b1b6 6f7f5cf2
05f1de39 4fa987a7 03dc3fc6 c3957613
b33e69a9 143ae272 cd3e02b1 4db3c5d4
24ab0695 27e3e813 2a7b7ecf 8bbd05df
Hash of new_challenge file for participant #7
3e1140e5 66971cbd e6308dc3 d3f2ef4e
2c36bb4d b16704ed 0ffd26ee 7d80ccce
f2b46aa4 6feadf3e 2da8c43e ccf7588a
09e6cd94 85a4dd05 20af752d b0f24128
Entropy sources: Randomly key mashing, not much else!
Time taken: around 48 hours.
Side channel defences: None
Attached the attestation as a file and a GPG signature. The signature can be verified with gpg --verify zac_attestation.sig zac_attestation.txt.
Zac