OMM TECHtalks #5 www.tech-talks.eu

1. OMM Solutions
TECHtalk #5
1< OMM Solutions GmbH >26.07.2017
www.tech-talks.eu

2. Einmal im Monat ist TECHtalk Zeit! First come first served!
< OMM Solutions GmbH > 2

3. Talk: How can we make a SmartContract usable
for everyone
Speaker: Olaf Horstmann
3< OMM Solutions GmbH >

4. The pain points of a „raw“ Smart Contract
• You can‘t run a full ethereum-node on a mobile device/weak
notebook
• requires a lot of storage
• requires a lot of CPU
• requires the device to be turned on almost 24/7
• Installing several new tools might be too much already for some users
• Smart Contracts don‘t come with an UI
• Auto-Generated UIs never have a good usability
„Raw“ Smart Contracts are not easy to use
< OMM Solutions GmbH > 426.07.2017

5. „Light Clients“ to the rescue
526.07.2017 < OMM Solutions GmbH >
What is a „Light Client“
• Just a connection to a full node to query and send information
• e.g.: „What is the current balance of address „0xF484AA0D23….“
• The only permanently stored information are the account-numbers + private keys
• The only active „computing“ that is done, is signing a transaction with the private key
• no smart contracts are executed, no balances are calculated, ect…
• requires close to zero disk-space
• requires almost no compute-power
• many apps and browser-extensions are available
• no „higher risk“ involved, because private keys are kept locally only
Benefits
• higher data-consumption (every piece of data needs to be fetched through the
network/internet)
• usually somewhat limited in functionality regarding smart-contracts
• dependant on just one node (vs. running own node, that is connected to many other nodes)
• the remote node might become unavailable
• the remote node might send false information or not relay our transactions
Drawbacks

6. There still needs to be a full node somewhere
626.07.2017 < OMM Solutions GmbH >
Schema of how a Light Client is connected
- Please relay this transaction „X“ to the blockchain …
- Please send me update on contract 0xF83D04A…
Update-Event on Contract 0xF83D04A…: BetOffered(El Classico, 15$)
Private Key
Account/Wallet
Light Client
Full Node

7. • Metamask (Browser-Extension, OpenSource)
• JAXX (Mobile/Desktop, Multi-Chain)
• imToken (Mobile App)
• myetherwallet.com (Fully featured in-browser application)
• LightWallet (JavaScript-library that works in combination with the web3-library)
Selection of available Light Clients
26.07.2017 < OMM Solutions GmbH > 7

8. • since Light Clients only exchange data via the internet with a fixed Ethereum-Node
=> this can also be done with pure JavaScript from within a website
• however, the user would have to provide any account-information manually for every
contract-UI
• instead of connecting to a node directly, we‘ll go through a Light Client (e.g. Metamask)
That still leaves the UI challenge for Smart Contracts
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9. Example Workflow with Metamask (Browser Extension)
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1. User visits some SC-App
2. Browser loads installed Extensions (incl. Metamask)
3. Metamask injects Code into the SC-App
4. SC-App uses injected Code to query Blockchain-Data
5. User interacts with SC-App
6. Whenever an action requires a transaction, the SC-App
queries the user via Metamask to confirm
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10. Demo
26.07.2017 < OMM Solutions GmbH > 10

11. • it is possible to initiate transactions via a website
• though it requires an extension or a blockchain-enabled browser
AND a remote Full Node
• any transaction has to be manually confirmed by the user
• the application cannot acces any private keys
• currently Metamask injects into any website (privacy-features are
on the roadmap)
• transaction-fees are currently very high
Current state of the art
26.07.2017 < OMM Solutions GmbH > 11

12. Vielen Dank für Eure Aufmerksamkeit!
12< OMM Solutions GmbH >

13. Ihr persönlicher Ansprechpartner
Fragen oder Interesse?
< OMM Solutions GmbH > 13
Olaf Horstmann
Technology & Innovation
OMM Solutions GmbH
Vor dem Lauch 4
70567 Stuttgart
Germany
oh@omm-solutions.de
+49 (0)711 75 86 46 04

14. 14< OMM Solutions GmbH >
www.omm-solutions.de
OMM Solutions GmbH
Vor dem Lauch 4
70567 Stuttgart
Geschäftsführer
Martin Allmendinger
Malte Horstmann
Olaf Horstmann
Kontakt
Telefon: +49 711 6747 051-0
E-Mail: info@omm-solutions.de
Umsatzsteuer-ID: DE295716572
Sitz der Gesellschaft: Stuttgart
Amtsgericht Stuttgart, HRB 749562
Impressum