OST's Benjamin Bollen presents at ETHCC2019 on designing blockchain UX to enable crypto adoption by millions of users. Ben also presents details on the OST Wallet SDK for mass market usage: -Business can issue Brand Tokens to their users -Txs on sidechains -Noncustodial wallet -Writing down 12 words is optional for the user -Ephemeral keys, biometrics, for everyday tx -Secure recovery fr smart contract w/ PIN

1. Personas for
Blockchain Product Development
EthCC - Paris - 7 March 2019
@benjaminbollen, ben@ost.com

2. Distribution
is the product.
Photo by Erda Estremera on Unsplash

3. Photo by Daryn Stumbaugh on Unsplash
To build a
decentralized
internet
we need to
put keys in the hands of people;

4. Photo by Daryn Stumbaugh on Unsplash
To build a
decentralized
internet
we need to
put keys in the hands of millions of people;
one contribution:
put Ethereum inside mainstream apps.

5. Photo by Toa Heftiba on Unsplash
But how do we navigate the landscape?

6. Personas for
Blockchain Product Development
ownership of value
transparent platforms
data sovereignty

7. Jobs To Be Done framework.
Photo by Mourad Saadi on Unsplash
A good App gets me to where I need to go.

8. Photo by Luke Chesser on Unsplash
App developers too have a job to get done,
improve user engagement.

9. A first pilot: Hornet, Gay Social Network
25 million users. soon on Ethereum mainnet.

10. The user already has his Job To Get Done.
Don’t get in his way.

11. Educate.

12. Educate. But don’t ask too much.

13. Wallet SDK manages etherless keys.

14. • manages device keys
• owns TokenHolder contract
each device has a device key
Wallet SDK manages etherless keys.

15. session keys for
in-app transactions
• manages session keys
• holds LGBT tokens
• manages device keys
• owns TokenHolder contract
each device has a device key
Wallet SDK manages etherless keys.

16. user has unique recovery key
• initiate recovery for new device
session keys for
in-app transactions
• manages session keys
• holds LGBT tokens
• manages device keys
• owns TokenHolder contract
each device has a device key
Wallet SDK manages etherless keys.

17. recovery key
<EIP-712 structured data>
session keys
<EIP-1077 executable Tx>
<Gnosis SafeTx>
device keys
All keys sign etherless, executable transactions.

18. OST relays executable transactions to Ethereum.

19. OST relays executable transactions to Ethereum.
2
…layer-2 scaling on…

20. 🎉 LGBT Token

21. But apps get uninstalled, keys get lost.

22. But apps get uninstalled, keys get lost.
yes! write down 12 words.
yes! have multiple devices.

23. But apps get uninstalled, keys get lost.
yes! write down 12 words.
yes! have multiple devices.
but millions of people
won’t.

24. Distribution
is the product.
Photo by Erda Estremera on Unsplash

25. 6 digit PIN.

26. 6 digit PIN. Needs more entropy.
recovery key derived
from secrets and PIN
user secret2user secret1
entropy-rich entropy-rich

27. 6 digit PIN. Needs more entropy.
recovery key derived
from secrets and PIN⚠brute force
user secret2user secret1
entropy-rich entropy-rich

28. contract enforces
delay on recovery
6 digit PIN. Needs more entropy. Needs
user secret2user secret1
entropy-rich entropy-rich
recovery key derived
from secrets and PIN

31. Personas for
Blockchain Product Development
ownership of value
transparent platforms
data sovereignty

32. OST relays executable transactions to Ethereum.
2
…layer-2 scaling on…
ownership of value
transparent platforms
data sovereignty

33. Meet Mappy, Happy,
and Dappy
Personas for
Blockchain Product Development
EthCC - Paris - 7 March 2019
@benjaminbollen, ben@ost.com
github.com/openstfoundation
🙏