Quote from: Qtum on July 24, 2017, 01:20:04 PM

Announcing the winners of the Distributed 2017 Hackathon in St. Louis:

Winner of the $10,000.00 prize awarded in Qtum tokens:

D-REX (Built on Qtum Testnet)

Portions of this project received funding from the World Bank

Lead Developer: Dev Bharel

D-REX (Distributed Real-time Energy Exchange)

https://devpost.com/software/d-rex

Abstract: Provide a marketplace for financiers and providers to issue and purchase electricity futures. By creating a market for microfinancing generation of electricity we can crowdfund infrastructure to provide electricity for the 1.5 billion people in the world currently without.

User Groups:

Consumers:

Consumers are the people interacting with the electric generators to receive electricity. They spend Solar Tokens using their mobile client (or SMS codes) at generators to pay for electricity in kilowatt hour chunks.
They can also create requests for solar generators in their region, detailing location, wattage usage, reason for electricty need, etc, which can be bid on by providers and funded by financiers.

Providers:

Providers bid on requests from consumers. They provide bids detailing type of solar energy unit, cost of installation, time for installation, their insurance, etc.

(FUTURE) Need to be verified or have some reputation modeling or have some sort of insurance.

Insurers:

Planned for the future
Insure providers or financiers
Provide derivatives of energy futures. Sell part ownership of many utilities for n time.
Financiers:
Can be large institutions (Royal Bank of Scotland, Deutsche Bank, etc) or anyone with money. Can even be part or fully owned by the community itself.
Get the emotional payout of helping bring electricity to the underprivileged as well as the financial incentive into micro financing infrastructure.

Specs:

Request: {
   Location: STRING,
   Creator: STRING, //address of the owner who submitted the tx
   WATTAGE_REQ: INT,
   REASON: STRING
}

Bid: {
   ProviderAddr: STRING,
   Unit_type: STRING,
   Cost_of_installation: INT
}

Process:

Consumers make a request for a new generator. They list the location, wattage requirements, reason for request, etc.
Providers look through requests and bid on them. They include the type of generator, cost of installation, time for installation, insurance, etc. This bidding process is open for ONE WEEK. Consumers can then accept one of the bids, at which point...
Financiers bid on consumer accepted requests. This process is open for ONE MONTH. If the request is successfully funded a generator contract is created to represent the pending device.
The Financiers that own the the generator should all call the smart contract and submit their preferred cost for electricity the smart contract should charge. The price is the average of all submitted values weighted by the ownership stake each financier has. If no financier has submitted a price request, then the average is just 0 and the generator runs for free. If only some of the financiers have provided a price, its just the average of the ones provided. If you dont vote, you dont get a voice and must accept the price set by your co financiers.

The Provider that won the bid then installs the generator in the location specified.
The Consumer that issued the request than approves the installation by instantiating the generator by sending an initial token to it. The first tx MUST be by the Consumer that issued the request. After initialization, the generator can be funded by anyone and used by anyone.

Consumers can then fund the generator get electricity. They pay in solar tokens which are then disbursed to financiers proportionate to their ownership stake in the generator. Consumers can buy these solar tokens from exchanges.
Financiers make money by selling their solar tokens on exchanges to anyone who wants to buy. Solar tokens have a consumptive value on the platform, not just a speculative value, so theres always a demand.

Tech:

Contracts:

Solar Tokens: ERC 20 token contract. ICO a limited supply of x million .
MarketPlace (split into two sections):
New Generators: Consumers make requests with the given metadata (location, wattage, reason for request, etc). Request is bid on and then awarded.
Old Generators: Financiers can sell all or part of their ownership of their generators or even market futures and based on the generators ownerships they own.

Generators:

Each generator is its own smart contract. Issues 10,000 (100.00%) ownership tokens at inception based on proportionate financing.
GetAvg(): read only function that returns the average price of what the generator should charge for electricity.
Status pending until first tx which needs to be done by Consumer who created the initial request.
(Future) Funds set aside for maintenance / some catch for it.

Stack:

Flask Microservice to interact with Qtum RPC
React front end for UI

Interesting Points:

Very interesting use case for trusted execution environments. Only the solar generator should be able to make its transactions, someone shouldnt be able to mess with it.
Smart Contracts built with generic Utility Model. Crowdfunding electricity now, but could crowdfund any utility (Water Mill, Textile Machines, etc)
Providers can have radically different ways units and reputation. There should be a insurer for

Congrats to the winners! Second and third place???