TOP TEN OBSTACLES FOR DISTRIBUTED LEDGERS SARAH MEIKLEJOHN (UCL)

DATA DATA CONSUMERS PRODUCERS (icons by parkjisun from noun project)

TOP TEN OBSTACLES [ M 18] 10 Usability 9 Governance 8 Comparisons 7 Key Management 6 Agility 5 Interoperability 4 Scalability 3 Cost-Effectiveness 2 Privacy 1 Scalability

TOP TEN OBSTACLES 10 Usability 9 Governance 8 Comparisons 7 Key Management 6 Agility 5 Interoperability 4 Scalability 3 Cost-Effectiveness 2 Privacy 1 Scalability

CENTRALIZATION

“Who makes the rules (i.e., governance) is at least as important as how the rules are enforced” Vili Lehdonvirta

HOW TO COMPARE SOLUTIONS? opaque transparent centralized decentralized what is this distance? can we quantify it?

(image from Provenance report: https://www.provenance.org/tracking-tuna-on-the-blockchain)

DATA DATA CONSUMERS PRODUCERS (icons by parkjisun from noun project)

SCALABILITY 150GB and no end in sight!

RISKS OF ANONYMOUS PAYMENTS ONLINE DRUG SALES “CYCLE THEFT” THEFTS EXTORTION

RISKS OF ANONYMOUS PAYMENTS ONLINE DRUG SALES “CYCLE THEFT” HOW MUCH ANONYMITY DOES BITCOIN REALLY PROVIDE? THEFTS EXTORTION

FISTFUL OF BITCOINS [ M PJLMVS’13] mtgox instawallet satoshi dice btc dice silk road clone dice

REAL-WORLD BITCOIN TRACKING

IMPROVING ANONYMITY Approach 1: Design a standalone privacy-enhanced currency Approach 2: Design a privacy overlay for an existing currency centralized decentralized

MÖBIUS [ M M’18] anonymity availability theft msgs txs (tr) 1 2 naïve 12 4 TumbleBit (r) n 2 1 Coinjoin (r) 0 7* XIM (s) 2* 2 Möbius decentralization with minimal coordination costs

SCALABILITY 16 EH/s (16 x 10 18 H/s) to achieve 7 tx/s!

SCALABILITY 16 EH/s (16 x 10 18 H/s) to achieve 7 tx/s! ↑ COMPUTATIONAL POWER ⇒ ↓ THROUGHPUT

THANKS! ANY QUESTIONS?

TOP TEN OBSTACLES FOR DISTRIBUTED LEDGERS SARAH MEIKLEJOHN (UCL) - PowerPoint PPT Presentation

TOP TEN OBSTACLES FOR DISTRIBUTED LEDGERS SARAH MEIKLEJOHN (UCL) DATA DATA CONSUMERS PRODUCERS (icons by parkjisun from noun project) DATA DATA CONSUMERS PRODUCERS (icons by parkjisun from noun project) TOP TEN OBSTACLES [ M 18] 10

TOP TEN OBSTACLES FOR DISTRIBUTED LEDGERS SARAH MEIKLEJOHN (UCL) TOP TEN OBSTACLES [ M 18] 10

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