Monero Presentation by Justin Ehrenhofer - Copenhagen, Denmark 2017

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Monero is a cryptocurrency that focuses on privacy and anonymity. It uses ring signatures to hide the origin and destination of transactions, and ring confidential transactions to conceal amounts. Monero development includes ongoing work to improve privacy through techniques like larger minimum ring sizes, improved input selection algorithms, and integration with networks like I2P. The Monero community is also growing to support further development and adoption of the currency.

Technology

SECURE. PRIVATE. UNTRACEABLE.
Copenhagen, Denmark

Welcome
Justin Ehrenhofer
Finance
Management Information Systems
/u/SamsungGalaxyPlayer or sgp_
CryptoUMN.com

The Monero Difference
SENDER RECEIVER
RING
SIGNATURES
STEALTH
ADDRESSES
AMOUNT TRANSACTION
BROADCAST
ɱ
KOVRI
(I2P ROUTER)
RING CONFIDENTIAL
TRANSACTIONS (RINGCT)

Ring Signatures & RingCT
8 (Tx ID hng6iwfumwf8)
9 (Tx ID cb8vqfi8dfj65f)
1 (Tx ID e4hn4ifqyd5ed)
3 (Tx ID wb4f5hdfdicnd)
4 (Tx ID nh5nogsefwjw)
6 (Tx ID ybwnng8nengf)
2 (Tx ID eshgni5lsvnf74)
5 (Tx ID fgwinw3fwtk54)
7 (Tx ID e4bgn8flwwrj8)
10 (Tx ID fnidmfnu3dm8)
11 (Tx ID twv8mf8dnfas)
13 (Tx ID 7nr8mrjffijdtm)
12 (Tx ID h5o8mfdngkd)
14 (Tx ID f8n8madkrjmd)
15 (Tx ID wn3f4diiijffwn)
16 (Tx ID 5 f8wnfdmmii)
17 (Tx ID h8fn5mdfi4w)
18 (Tx ID n48gfwmfdki)
20 (Tx ID t4vn8lf8djer4)
19 (Tx ID fnidmnfdsam)
21 (Tx ID 4f5f8njdoam4)
BLOCKCHAIN
8 (Tx ID hng6iwfumwf8)
5 (Tx ID fgwinw3fwtk54)
11 (Tx ID twv8mf8dnfas)
15 (Tx ID wn3f4diiijffwn)
18 (Tx ID n48gfwmfdki)
21 (Tx ID 4f5f8njdoam4)

Ring Signatures & RingCT
Ringsize=6
INPUTSMinimumSeptember2017*
MinimumToday
5 (Tx ID fgwinw3fwtk54)
8 (Tx ID hng6iwfumwf8)
11 (Tx ID twv8mf8dnfas)
15 (Tx ID wn3f4diiijffwn)
18 (Tx ID n48gfwmfdki)
21 (Tx ID 4f5f8njdoam4) key image

5 (Tx ID fgwinw3fwtk54)5 (Tx ID fgwinw3fwtk54)
8 (Tx ID hng6iwfumwf8)
11 (Tx ID twv8mf8dnfas)
15 (Tx ID wn3f4diiijffwn)
18 (Tx ID n48gfwmfdki)
21 (Tx ID 4f5f8njdoam4)
Ring Signatures & RingCT
Ringsize=6
INPUTSMinimumSeptember2017*
MinimumToday
8 (Tx ID hng6iwfumwf8)
11 (Tx ID twv8mf8dnfas)
15 (Tx ID wn3f4diiijffwn)
18 (Tx ID n48gfwmfdki)
21 (Tx ID 4f5f8njdoam4) key image
RingCT ring signature,
signs difference
between commitments
? XMR
Pedersen commitment
rCT = x*G + a*H(G)
Commitment
public key
Random Number Actual Amount

Ring Signatures & RingCT
5
8
11
15
18
21
INPUTS
NewerOlder
Coinbase Transaction
(New Money)
Input Actually
Spent
Someone Else
Borrowed Input

How Inputs Are Selected
AT LAUNCH
CURRENT (IMPROVED TRIANGULAR DISTRIBUTION)
IDEAL
ENTIRE BLOCKCHAIN
Time Since Last Spent

ORIGIN
NODE
12.154.85.166
LOGGING
NODE
Tx ID: 375wd4h

ORIGIN
NODE
3dsnf28.i2p
LOGGING
NODE
Tx ID: 375wd4h

Stealth Addresses
OUTPUTS
? XMR
Back to Sender
To Receiver
INPUTS
100 XMR
OR
hfk5yndjdmnfirwm5dnu
7yf8dji8fbwb4f5hdfdicnd
ey5f8ne58nh5nogsefwjw
58fmd8jhybwnng8nengf
5hfnq835hng6iwfumwf8
3348dqnqcb8vqfi8dfj65f
Commitment public key

Summary
5 (Tx ID fgwinw3fwtk54)
8 (Tx ID hng6iwfumwf8)
11 (Tx ID twv8mf8dnfas)
15 (Tx ID wn3f4diiijffwn)
18 (Tx ID n48gfwmfdki)
21 (Tx ID 4f5f8njdoam4)
? XMR
hfk5yndjdmnfirwm5dnu
7yf8dji8fbwb4f5hdfdicnd
ey5f8ne58nh5nogsefwjw
58fmd8jhybwnng8nengf
5hfnq835hng6iwfumwf8
3348dqnqcb8vqfi8dfj65f
Commitment public key

Mandatory Privacy
Source: MoneroBlocks.info 24 Feb 2016
Source: zcha.in 15 March 2017

A Brief History
Adapted from Scott Anecito’s Presentation

Regulatory Compliance and Transparency
A view key is used to
reveal all transactions for
a Monero account, or just
the key for a single
transaction
Transparency
View keys can be given to
selected parties, or can be
made public
Selected Parties
By publishing their view
key, charities can invite
easy public oversight
Charities
Children can be given
their own accounts, and
parents can monitor their
spending
Parents
(with the View Key)
Adapted from Riccardo Spagni’s Presentation

Ongoing Development
Multisig Sub-Addresses Translations
Lightweight
Wallet
RingCT
Optimizations
Community

Hardfork Schedule
September 18th*
• Mandatory RingCT
• Minimum ringsize ≥5 (likely 10)
• Fluffy blocks (in testing now)
• Improved input selection algorithm
• 0MQ
• Sub-Addresses
January April September

XMR.TO – Pay Bitcoin Addresses with Monero

Thank You!
monero.stackexchange.com
getmonero.org
/r/Monero
justin@ehrenhofer.org

Monero is a cryptocurrency that focuses on privacy and anonymity. It uses ring signatures and ring confidential transactions (RingCT) to obscure transaction amounts and the origin of funds. Ring signatures group transactions together so the real input is indistinguishable among others in the group. RingCT further hides transaction amounts using Pedersen commitments. Monero also uses stealth addresses to mask the recipient and Kovri to further anonymize IP addresses. Upcoming upgrades will increase the minimum ring size and implement other improvements to enhance privacy and usability.

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Monero Presentation by Justin Ehrenhofer - Copenhagen, Denmark 2017

1. SECURE. PRIVATE. UNTRACEABLE. Copenhagen, Denmark

2. Welcome Justin Ehrenhofer Finance Management Information Systems /u/SamsungGalaxyPlayer or sgp_ CryptoUMN.com

3. People Started Adding Tools to Bitcoin

4. People Started Adding Tools to Bitcoin

5. People Started Adding Tools to Bitcoin

6. The Monero Difference SENDER RECEIVER RING SIGNATURES STEALTH ADDRESSES AMOUNT TRANSACTION BROADCAST ɱ KOVRI (I2P ROUTER) RING CONFIDENTIAL TRANSACTIONS (RINGCT)

7. Ring Signatures & RingCT 8 (Tx ID hng6iwfumwf8) 9 (Tx ID cb8vqfi8dfj65f) 1 (Tx ID e4hn4ifqyd5ed) 3 (Tx ID wb4f5hdfdicnd) 4 (Tx ID nh5nogsefwjw) 6 (Tx ID ybwnng8nengf) 2 (Tx ID eshgni5lsvnf74) 5 (Tx ID fgwinw3fwtk54) 7 (Tx ID e4bgn8flwwrj8) 10 (Tx ID fnidmfnu3dm8) 11 (Tx ID twv8mf8dnfas) 13 (Tx ID 7nr8mrjffijdtm) 12 (Tx ID h5o8mfdngkd) 14 (Tx ID f8n8madkrjmd) 15 (Tx ID wn3f4diiijffwn) 16 (Tx ID 5 f8wnfdmmii) 17 (Tx ID h8fn5mdfi4w) 18 (Tx ID n48gfwmfdki) 20 (Tx ID t4vn8lf8djer4) 19 (Tx ID fnidmnfdsam) 21 (Tx ID 4f5f8njdoam4) BLOCKCHAIN 8 (Tx ID hng6iwfumwf8) 5 (Tx ID fgwinw3fwtk54) 11 (Tx ID twv8mf8dnfas) 15 (Tx ID wn3f4diiijffwn) 18 (Tx ID n48gfwmfdki) 21 (Tx ID 4f5f8njdoam4)

8. Ring Signatures & RingCT Ringsize=6 INPUTSMinimumSeptember2017* MinimumToday 5 (Tx ID fgwinw3fwtk54) 8 (Tx ID hng6iwfumwf8) 11 (Tx ID twv8mf8dnfas) 15 (Tx ID wn3f4diiijffwn) 18 (Tx ID n48gfwmfdki) 21 (Tx ID 4f5f8njdoam4) key image

9. 5 (Tx ID fgwinw3fwtk54)5 (Tx ID fgwinw3fwtk54) 8 (Tx ID hng6iwfumwf8) 11 (Tx ID twv8mf8dnfas) 15 (Tx ID wn3f4diiijffwn) 18 (Tx ID n48gfwmfdki) 21 (Tx ID 4f5f8njdoam4) Ring Signatures & RingCT Ringsize=6 INPUTSMinimumSeptember2017* MinimumToday 8 (Tx ID hng6iwfumwf8) 11 (Tx ID twv8mf8dnfas) 15 (Tx ID wn3f4diiijffwn) 18 (Tx ID n48gfwmfdki) 21 (Tx ID 4f5f8njdoam4) key image RingCT ring signature, signs difference between commitments ? XMR Pedersen commitment rCT = x*G + a*H(G) Commitment public key Random Number Actual Amount

10. Ring Signatures & RingCT 5 8 11 15 18 21 INPUTS NewerOlder Coinbase Transaction (New Money) Input Actually Spent Someone Else Borrowed Input

11. How Inputs Are Selected AT LAUNCH CURRENT (IMPROVED TRIANGULAR DISTRIBUTION) IDEAL ENTIRE BLOCKCHAIN Time Since Last Spent

12. ORIGIN NODE 12.154.85.166 LOGGING NODE Tx ID: 375wd4h

13. ORIGIN NODE 3dsnf28.i2p LOGGING NODE Tx ID: 375wd4h

14. Stealth Addresses OUTPUTS ? XMR Back to Sender To Receiver INPUTS 100 XMR OR hfk5yndjdmnfirwm5dnu 7yf8dji8fbwb4f5hdfdicnd ey5f8ne58nh5nogsefwjw 58fmd8jhybwnng8nengf 5hfnq835hng6iwfumwf8 3348dqnqcb8vqfi8dfj65f Commitment public key

15. Summary 5 (Tx ID fgwinw3fwtk54) 8 (Tx ID hng6iwfumwf8) 11 (Tx ID twv8mf8dnfas) 15 (Tx ID wn3f4diiijffwn) 18 (Tx ID n48gfwmfdki) 21 (Tx ID 4f5f8njdoam4) ? XMR hfk5yndjdmnfirwm5dnu 7yf8dji8fbwb4f5hdfdicnd ey5f8ne58nh5nogsefwjw 58fmd8jhybwnng8nengf 5hfnq835hng6iwfumwf8 3348dqnqcb8vqfi8dfj65f Commitment public key

16. Mandatory Privacy Source: MoneroBlocks.info 24 Feb 2016 Source: zcha.in 15 March 2017

17. A Brief History Adapted from Scott Anecito’s Presentation

18. The Infamous GUI

19. MyMonero Lightweight Wallet

20. Regulatory Compliance and Transparency A view key is used to reveal all transactions for a Monero account, or just the key for a single transaction Transparency View keys can be given to selected parties, or can be made public Selected Parties By publishing their view key, charities can invite easy public oversight Charities Children can be given their own accounts, and parents can monitor their spending Parents (with the View Key) Adapted from Riccardo Spagni’s Presentation

21. Monero Limitations …but so close!

22. Ongoing Development Multisig Sub-Addresses Translations Lightweight Wallet RingCT Optimizations Community

23. Hardfork Schedule September 18th* • Mandatory RingCT • Minimum ringsize ≥5 (likely 10) • Fluffy blocks (in testing now) • Improved input selection algorithm • 0MQ • Sub-Addresses January April September

24. Community Growth

25. Community Growth

26. XMR.TO – Pay Bitcoin Addresses with Monero

27. Thank You! monero.stackexchange.com getmonero.org /r/Monero justin@ehrenhofer.org

Editor's Notes

CoinJoin requires other participants to mix with. DASH, which built its PrivateSend functionality on CoinJoin, requires at least 3 participants. The service performing the functionality, whether it is a centralized server for Bitcoin or a randomly-selected masternode for DASH, can log what money goes where.
CoinJoin requires other participants to mix with. DASH, which built its PrivateSend functionality on CoinJoin, requires at least 3 participants. The service performing the functionality, whether it is a centralized server for Bitcoin or a randomly-selected masternode for DASH, can log what money goes where.

Monero Presentation by Justin Ehrenhofer - Copenhagen, Denmark 2017

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Editor's Notes