Stamp.IO Proof Challenge

A challenge.

Prove that a file or hash uploaded to stamp.io, and the certificate page that stamp.io provides, can
be used to unequivocally, deterministically, and mathematically prove that the file existed
on or before the timestamp in the certificate.

The answer code:

Sample code in pure javascript, executed with node, using the current stampery NPM package installed from npmjs.org.
All dependencies should be only an 'npm install' away and run with e.g. 'npm test'.

Part 1:

Simulate that you are a lawyer in a court of law, and you need to prove to a judge and jury
that a file in your possession can be proven to have been in existence on a certain date/time.

You can use only the provided file, which hashes to the hashes shown below, and the data present on
the certificate that was generated when I uploaded that file to stamp.io. The URI for that cert
is also below. You can provide the answer in javascript code that I can run locally to match this
file, and a hash derived from it, to that certificate and the data displayed on it.

```
wget https://raw.githubusercontent.com/grempe/sirp/master/certs/gem-public_cert_grempe.pem

$ sha256sum gem-public_cert_grempe.pem
60dfb0a3c86860dc0de93d7a48ce5724d5ddaced917fe899689675f5b4e8d25f  gem-public_cert_grempe.pem

$ sha512sum gem-public_cert_grempe.pem
def0fb3da615f0d1ebe55070f3271cdbb1187e53b2122102b77029ad9618d0a001635e5a31398fb1248d57374b59c29d78d3475eda88b4f20d247757e59e18ed  gem-public_cert_grempe.pem

# STAMP.IO CERT URI
https://stamp.io/stamp/ip1vw6ir
```

Bonus Points:

Using the same data above, and the same certificate and its data, tie the file in possession of
the simulated laywer, to data on the bitcoin and ethereum blockchains which mathematically prove
the existance of the file. Again, only the file, its hash and the public cert can be used as
inputs to finding the data. If you need to run a script to calculate something that should also
be pure JS like above.

Part 2:

Using the same file, or the hash of its contents, provide a script that submits the hash to the
stampery API, receives the proof from the API, and verifies that the file can be proven to be the
only file that matches the web certificate/API data.

This simulates a developer submitting a file through the API and doing an end-to-end test that
not only can the file be uploaded and cert generated, but that the proof data can be provably tied to
the original file.

The challenge solution should also be pure JS code using public NPM packages installable with an NPM
install from a released version on npmjs.org.

Let the silence to be the response ....