Class 18: Midterm Confirmations Cryptocurrency Cabal cs4501 Fall 2015 David Evans and Samee Zahur University of Virginia
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Class 18:Midterm
Confirmations
Cryptocurrency Cabalcs4501 Fall 2015
David Evans and Samee ZahurUniversity of Virginia
Plan for Today
Midterm Discussion
1
Schedule Update:PS3 is due Sunday, November 8(There is no PS4)Project Pre-Proposal: Friday, November 13Project Update: Monday, November 23Last class: Monday, December 7
12
18 18 18
2726
2322
9
7
10
4
1 2 3 4 5 6 7 8 9 10 11 12
Midterm Summary
2
Nu
mb
er a
nsw
erin
g w
ell (
ou
t o
f 3
0)
Threshold of “bitcoin expert”qualification ~ 85
Confirmations
3
How long is the expected wait for the first confirmation?
4
5
Poisson Process
6
Bitcoin mining is memoryless:
7
8
Blockchain.info
9
10
https://www.quandl.com/data/BCHAIN/ATRCT-Bitcoin-Average-Transaction-Confirmation-Time
Project idea?How can average transaction confirmation time be less than Poisson rate?
Can we gain confidence without confirmations?
11
“Pre-confirmations”?
13
14
15
How do buyer and seller interact in a bitcoin transaction?
“Third-party intermediary”
16
17
18
19
12
18 18 18
2726
2322
9
7
10
4
1 2 3 4 5 6 7 8 9 10 11 1220
Nu
mb
er a
nsw
erin
g w
ell (
ou
t o
f 3
0)
Threshold of “bitcoin expert”qualification ~ 85
12
18 18 18
2726
2322
9
7
10
4
1 2 3 4 5 6 7 8 9 10 11 1221
Nu
mb
er a
nsw
erin
g w
ell (
ou
t o
f 3
0)
Threshold of “bitcoin expert”qualification ~ 85
If you didn’t reach “expert” qualification on the Midterm because of poor answer to questions 1-4, you can improve your score by finding incorrect statements in the Blockchain Report Josh mentioned, and restating them correctly (and clearly).
Transaction Scripts
22
Transaction Scripts
23
Charge
Upcoming office hours:
Now: 3:30-4:30pm (Samee, Rice 442)
Tomorrow: 2:30-3:30pm (Dave, Rice 507)
24
Related Documents
