Blockchain Explained: A Microlearning Event

1. Blockchain Explained
Jason Griffey
Affiliate Fellow
Berkman Klein Center for Internet & Society
Harvard University
An ALA Microlearning Event

2. Photo by Ryan Somma - http://flic.kr/p/8Tkc92
Encryption

3. Photo by Christiaan Colen - http://flic.kr/p/ycuxvU
Hash

5. • Person-to-Person
• No Central Authority
• Untrusted Parties
• Independent Verification
• Resistance to Manipulation

6. Photo by aehdeschaine - http://flic.kr/p/oRSH3B

7. ledger
Date - Time - Identity - Transaction Details

8. Block 44

9. Block 43 Block 44
Hash

10. Proof of Work

11. Block 43 Block 44
Hash
Block 45
Hash

12. ManyAuthors
VerifiedAuthorship
DistrustedAuthors
Decentralization
Robust Resistance To Manipulation
Validation For Ledger Entries

13. ledger Database
Date
Time
Identity
Transaction

14. Decentralized

16. Provenance
Metadata that reflects the chain of
ownership/possession of a
physical object.

17. Digital Provenance

18. Problems

19. Conclusion
Photo by benjaflynn - http://flic.kr/p/FAJjc7

22. https://ischoolblogs.sjsu.edu/blockchains/

23. https://eprint.iacr.org/2017/375.pdf
http://doyouneedablockchain.com/

24. –Roy Amara
“We tend to overestimate the effect of a
technology in the short run and
underestimate the effect in the long run.”
Amara’s Law

25. Remove Centers
Democratize Decisions
Reduce Friction
Distribute Power

26. P H O TO C R E D I T: C I N D I B LY B E R G
M E A S U R E T H E F U T U R E
H T T P : / / M E A S U R E T H E F U T U R E . N E T
A F F I L I AT E F E L L O W
B E R K M A N K L E I N C E N T E R F O R I N T E R N E T & S O C I E T Y
H A RVA R D U N I V E R S I T Y
G R I F F E Y @ G M A I L . C O M
H T T P : / / J A S O N G R I F F E Y. N E T
T H E L I B R A RY B O X P R O J E C T
H T T P : / / L I B R A RY B O X . U S
J A S O N G R I F F E Y
F O U N D E R / P R I N C I PA L C O N S U LTA N T
E V E N LY D I S T R I B U T E D L L C
H T T P : / / E V E N LY D I S T R I B U T E D . N E T