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Powers of Tau Participation Writeup
===================================
Date: 2017-11-23
Name: Adam Nagel
Location: South Florida, USA


Ceremony Software
=================
powersoftau repository commit
9e1553c437183540392a7231d0788318a19b18a3

cargo 0.24.0-nightly (abd137ad1 2017-11-12)


BLAKE2b hashes
==============
Challenge file
e15f7392ebe912c2f9419f4b4ed4242b6207bad916d22ffb10a0c9c08445ae6f0eebd35c7e52ecd5ff611bb8c8d6bedd9e711cd8485b88d6e2b0d276ee979bb7

The BLAKE2b hash of `./response` is:
cdb09d81 858da53b 5581c25d 805e442b
5a37bf75 ccb1e1b3 104d9886 742c2dae
220cc817 9902653e 1783ba13 f47d5367
8360ba3f 7f3d1557 e1472b07 1b796fc5

/usr/local/bin/cargo
a5adde35def05d778b9490ba8813f5085ec9a55e88f0fe7c42282508a43774625c2fd84f01383ff3478d345fe8dd1a455096380d37bcf51f4424924c2bf3c07d

./target/release/compute
88b2a3d5b8740ff699d6e9ba516d3dcebbcc36c5df64eeeb529ecda8f792de032fad915fbb23168bba8c65a02ff3695176fd1321413b1a6247082137f5f9334d

./target/release/compute (with --features=u128-support)
dae100bbdbd9fd6c1280422906ae6fd0dc9c7115d75749c0df01ad8f106924ede534f5ffcdd61255e15d383dd0384d2efe90afc9f2fc27e745996714ec8b20b0


Procedure
=========
I prepared a 2013 Macbook Pro with cargo, powersoftau, and FileVault on
November 15 at my home in Nashville, disabled the radios, and left it
powered off until today.

My turn came up while vacationing in Florida and traveling in a rented car.
This morning, I sat down in the first coffee shop I encountered and used a
second laptop to download the challenge file to a USB stick. Then I copied
the challenge file to my compute machine.

Entropy was generated with about 30 seconds of key-mashing. I allowed it to
run while driving around Homestead and Florida City, leaving the Bluetooth
and Wifi radios disabled. When the process completed, I made a copy of the
response file.

I then performed another computation from Long Pine Key Campground in
Everglades National Park, with entropy generated using the same process.

A coin flip determined which response file to use. The winner was
transferred to USB stick and uploaded to S3 over Verizon 4G LTE from the
campground.

In an effort to overwrite the RAM and run out the battery, I started two
instances of `cargo test`. Add in the South Florida heat, and the fans have
never worked so hard. I intend to leave this computer off for several
weeks, re-format its hard drive, and use it for other purposes in the
future.

Thanks to Sean for coordinating everything, and thanks to the community for
the chance to participate.
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