Verifiable Delay Functions take a prescribed time to compute, even on a parallel computer, yet produce a unique output that can be efficiently and publicly verified.

We implement the approaches described in the following papers:

1. Sloth(Quadratic Residue) Verifiable Delay Functions. Boneh, 2018
2. Simple Verifiable Delay Functions. Pietrzak, 2018
3. Efficient Verifiable Delay Functions. Wesolowski, 2018

To build from the source code you need to have a working Go environment with version 1.12 or greater installed.

$ git clone https://github.com/keyfuse/vdf
$ cd vdf
$ make build

./bin/vdf -x=7 -t=1000
T:1000, x:7, P:8740186361822062383
-->
Type:	Sloth Quadratic Residue
Value:	37602270514657052337634791495305873950174757777621818362566683935496339681801
Delay:	0.10983 secs
Verify:	0.00064 secs
Verify Result:	true
Delay/Verify:	170.32087

VDF is released under the GPLv3 License.