Monetising Resources on a SoLiD Pod Using Blockchain Transactions (ESWC Demo)

Hendrik Becker, Hung Vu, Anett Katzenbach, Christoph Braun & Tobias Käfer, Institute AIFB, Karlsruhe Institute of Technology (KIT), Germany

Abstract. Our demo showcases a system that allows users to provide access to web resources in exchange for payments via the Ethereum blockchain. The system enables users to create offers for their resources or buy access rights for resources belonging to other users. Access rights can be granted only for a limited amount of time. We built our system as SoLiD Pods and Apps: We developed two server modules for SoLiD Pods that automatically (1) grant access for valid payments via the blockchain and (2) remove expired access rights. On top, we developed a SoLiD App that allows to offer resources, browse and request offered resources, and make payments via the blockchain.

Resource	URI
Teaser (1 min)	https://www.youtube.com/watch?v=sqIeYRTrkEg
Website (inkl. 3 min video)	http://people.aifb.kit.edu/co1683/2021/eswc-demo-solibra/
Paper	http://people.aifb.kit.edu/co1683/2021/eswc-demo-solibra/solibra.pdf
Code	https://github.com/bright-fox/SolidBlockchain

Below, you find detailled instructions on how to set up our demo application.

Steps to deploy the application on a server or to run it locally

Clone the repository.
Install Docker Desktop e.g. from their homepage.
Optional Step: If you want to also run the server modules:
- Navigate into the Solidblockchain folder and open the docker-compose.yml file.
- Uncomment the server modules you want to use.
- Navigate into the server_modules folder and into the folders with the server modules you want to run e.g. processNotifications folder
- Create an .env file with the fields provided by the example.env file and fill it out with your information.
- Go to your browser and login to your Solid Pod specified in the .env file and add https://solid-node-client as a trusted application with read, write, append and control permissions in the preferences tab in your profile.
Setup your Solid Account
- See below
Navigate into the Solidblockchain folder.
Run docker-compose up --build to build the images and start the ganache container and the application container.

Steps to test the locally deployed application:

Download the Metamask extension e.g. for Chrome to create a cryptocurrency wallet.
- Follow the metamask instructions and create a new account.
- Change the network to Localhost:8545 (Ethereum Main Net > Localhost:8545)
- Click on the colored icon > Import account.
  - IMPORTANT: Import the ethereum account for the Solid account that you will login to in this application. The ethereum address of Metamask and inside your Solid profile has to match.
  - Copy and paste the private key to import the account (see below for the accounts)
```
Example:
The private key
0x586439f4062db2f604e1edf57f5e5bbf09d8c57fd969f1d98802ca425c83f0d9

will import the ethereum address
0x6a04b3199DD582ABF6ee3DA94968a9D92DdAe00E
```
Go on your browser (where the Metamask extension is also installed) to your locally deployed application URL e.g. http://localhost:3000.
- If Metamask pops up, connect with the imported account that has 100 ETH.
Login with your Solid Account.
Search on the Retrieve Resources page for other users and pay for an offer (If you use the server modules search for the user specified in the .env file to see the server modules in action).

Setup for your Solid accounts

Go to your browser and login to your Solid Pod.
Choose for every Solid account a different ethereum account and save it in the profile of the Solid account.

Save the ethereum account in the Solid profile.

@prefix ethon: <http://ethon.consensys.net/>.
@prefix : <#>.

:me ethon:controlsAccount :EthereumAccount.

:EthereumAccount a ethon:ExternalAccount;
ethon:address "0xYOURCHOSENADDRESS".

Available Accounts on Ganache Blockchain (do not use these accounts for trading real cryptocurrencies)

Available Accounts

(0) 0x7A59ba2A7edDBE60aCF31C56D7fEaB8574692359
(1) 0x6a04b3199DD582ABF6ee3DA94968a9D92DdAe00E
(2) 0x84EB7fb899dbC2DF379b162BE22698a1956216Ad
(3) 0xF88E89187F4F2247ad013436512c553541E0b6fB
(4) 0x0E08647796f6a2C065e4326F84226f71d1EEcEa4
(5) 0xB388b489b3bed496Aec036587aA2f457a78fa49c
(6) 0xab8Cf0805cC58E43B6Ae4B2b9f12B0C928223e8C
(7) 0x81096928961B0c9aDcB0fB13A961B2ce292F80F1
(8) 0x21daE63b3F015A6569738F9c151a7c5Fef8dd8cf
(9) 0xfB07DBE3C40068e2a4BE1A079021eB0B102863B2

Private Keys

(0) 0x71bc615d073e619e87e8734caed35fb2fb0fa91d3530f20caba2277fd02c9ac7
(1) 0x586439f4062db2f604e1edf57f5e5bbf09d8c57fd969f1d98802ca425c83f0d9
(2) 0xf4892982cf7b4b8fc4657526200452dcb6dd110d39426b38b46c4621aa19a717
(3) 0xcd985ab29662323c5b08ad893926868a898398e09725598c10ceb088f536b354
(4) 0x108958cc802b29d20d1710a39efeb0e0192d25d265cb659bc72d3cbcde38374e
(5) 0xac7ef6baa6a19e88ea1e9e4080345e74d793a71a836a08d26b901cf291f7ffb5
(6) 0x28680c7e3cbd078b4c71c11baa5a5d1dfed44bf423874dbcc93800912780ba21
(7) 0x95e5d1e15c7b198765d2278d7e646445877d47b03a054478bda496f75e98f02a
(8) 0x505292f1658cc9163307118c65d58b8caa8688f775d498dd74fed6a4cf2c91c7
(9) 0x0fbc2f04202939a80857c0a527bc8025357b3886da9577333575cf95c6682b53

Add the URL of the application e.g http://localhost:3000 as a trusted application in the Preferences tab of the solid pod and give it read, write, append and control permissions.

mfosterio/SolidBlockchain

Monetising Resources on a SoLiD Pod Using Blockchain Transactions (ESWC Demo)

Steps to deploy the application on a server or to run it locally

Steps to test the locally deployed application:

Setup for your Solid accounts

More Informations for the client and server modules is in the README.md inside their folders e.g. how to run them without docker.