Verification Workflow

まだ誰も着手していません。

### Verification Workflow
The verification module assumes the following workflow:


[source](https://sequencediagram.org/index.html#initialData=C4S2BsFMAIDVIE4gGYgMYENQHsB20B1bBAa2XGwHcAoai7AB2gBUENcBnNbAExgCVIHAK7hgHWgHkARgCtIaYNADKwYjAA8AWhZtO3PgmgAuXey69IPFZADmAW0i4lAamgBFYRnBgAniu4EGDdlEFtaJ2taAAUEbDVucGgtAD4zfUsjUwBhAAtvKFxbGGU7R2doADlaVnMDRGS0+CRURFNmlHQsEDxoQQBHYSElAApJJFsQXG8bWyqAGnSLPmtSucrFz28-APUASloO1qNU6Fj47ET2xE7MHHxBETEgA)

### Transcoder
The transcoder is a GPU running on a machine. We assume the verification module is shipped as a part of the code running on the GPU. The verification module is invoked for every transcoded segment, resulting in an array of values for validation and a single value for ranking. This list of values is published with the transcode result.

_Note: We should make sure this assumption is viable. What if the machine running the GPU is a stripped down crypto mining rig that may not have the ability to run the verification module?_

### Verifier
In the ideal world, the verifier would be a [Truebit](https://truebit.io/) module running on the Ethereum chain. There is a [prototype](https://github.com/livepeer/verification-truebit) built with a modified version of ffprobe, but we haven't ran it in production yet. In the mean time, we can assume it's a docker instance running on a cloud hosted instance with access to Ethereum.

The verifier invokes the quality measurement module, and compares the result with the input validation values (created by the transcoder). The verification reports `fail` if the values are different.

### Protocol
Smart contracts running on the Ethereum blockchain. The transcoder needs to monitor the challenge event in order to invoke the verification request.

### Object Store
We can assume it's a S3 bucket with public access.

ワークフロー図とリンク先の verification-truebit プロトタイプから始め、その後、記載されている transcoder、verifier、Ethereum プロトコル、S3 に関する前提を確認してください。完了とするには、具体的な実装範囲と検証済みのワークフローが必要ですが、この issue にはリポジトリのファイル名も実行すべきテストも記載されていません。

索引モデルが issue の本文から書いたものです。