See vb_attestation.txt in this directory for Vitalik Buterin's signed attestation.
Hash of the challenge file for verification:
7474dc21 f794d4ac fe75ceb7 36774ca0
5df34e59 40646583 c12d4f72 05f7cf40
aa45aef8 9f0da9ac f8ef1b4e b398638e
4dc84557 1a3e2e9f 1c92615d 68ba80d5
response was based on the hash:
7474dc21 f794d4ac fe75ceb7 36774ca0
5df34e59 40646583 c12d4f72 05f7cf40
aa45aef8 9f0da9ac f8ef1b4e b398638e
4dc84557 1a3e2e9f 1c92615d 68ba80d5
Hash of the response file for verification:
31ea680a 591f8062 6cad18b7 1f72218c
6fe1be52 493e6be0 b709a2cc 87a585d6
dfaae025 6ea6a569 373d89d4 cd8b6587
aec1ed9a d1fbf69c c9c46d4d 4acccc98
Blake2b hash of the new_challenge file for participant #25:
ab45d9d9 de4a950d a97ae2b1 d20fb7c6
1b6d1098 6cb02d41 8a8be0c6 4e2c99d6
c000a914 c03d9ab2 71ee07c0 990a41fb
56971420 2c380711 d722350c c19a1152
The above new_challenge file: https://ppot.blob.core.windows.net/public/challenge_0025
Vitalik's attestation:
### Attestation to response 0024
**Date:** 2020 Mar 10-13
Name: Vitalik Buterin
Location: Toronto
Device(s): Thinkpad X270
Challenge:
Blake2b: 7474dc21f794d4acfe75ceb736774ca05df34e5940646583c12d4f7205f7cf40aa45aef89f0da9acf8ef1b4eb398638e4dc845571a3e2e9f1c92615d68ba80d5
URL: https://ppot.blob.core.windows.net/public/challenge_0024
Software used: https://github.com/kobigurk/phase2-bn254/commit/bf852c168676a7afc5dd17b47ff9b8f394aeab8a
rustc 1.39.0 (4560ea788 2019-11-04) sha256=e68f193542c68ce83c449809d2cad262cc2bbb99640eb47c58fc1dc58cc30add
Response:
Blake2b: 31ea680a591f80626cad18b71f72218c6fe1be52493e6be0b709a2cc87a585d6dfaae0256ea6a569373d89d4cd8b6587aec1ed9ad1fbf69cc9c46d4d4acccc98
Entropy sources: Rust OsRng, obligatory keyboard mashing.
Time taken: ~50 hours
Side channel defenses: None.
Postprocessing:
I uploaded the response to an SFTP server provided by Wei Jie Koh.
I logged out/in, ran some ad-hoc memory filling script for good measure, and turned off the server.
Signed this file using ethereum account (vitalik.eth), made a PR on github (vbuterin).