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TOP TEN OBSTACLES FOR DISTRIBUTED LEDGERS SARAH MEIKLEJOHN (UCL) - - PowerPoint PPT Presentation
TOP TEN OBSTACLES FOR DISTRIBUTED LEDGERS SARAH MEIKLEJOHN (UCL) - - PowerPoint PPT Presentation
TOP TEN OBSTACLES FOR DISTRIBUTED LEDGERS SARAH MEIKLEJOHN (UCL) 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
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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
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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
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MINING CENTRALIZATION
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Vili Lehdonvirta
“Who makes the rules (i.e., governance) is at least as important as how the rules are enforced”
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GOVERNANCE CENTRALIZATION
1 4 7 11 16 21 26 31 36 41 46 51 56 61 Participant ID Number of IPs 2 4 6 8 10 12 Final Replaced Active Withdrawn Deferred Proposed BIP num allocated Rejected Draft
1 2 3 4 5 6 7 8 9 11 13 15 17 19 21 Participant ID Number of IPs 2 4 6 8 10 12 Accepted Draft Final Deferred
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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
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HOW TO COMPARE SOLUTIONS?
- paque
centralized transparent decentralized what is this distance? can we quantify it?
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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
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(image from Provenance report: https://www.provenance.org/tracking-tuna-on-the-blockchain)
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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
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DATA CONSUMERS DATA PRODUCERS
(icons by parkjisun from noun project)
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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
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SCALABILITY
150GB and no end in sight!
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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
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ONLINE DRUG SALES “CYCLE THEFT” THEFTS EXTORTION
RISKS OF ANONYMOUS PAYMENTS
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FISTFUL OF BITCOINS [MPJLMVS’13]
satoshi dice btc dice clone dice mtgox silk road instawallet
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REAL-WORLD BITCOIN TRACKING
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IMPROVING ANONYMITY
centralized decentralized
Approach 1: Design a standalone privacy-enhanced currency Approach 2: Design a privacy overlay for an existing currency
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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
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SCALABILITY
30 EH/s (30 x 1018 H/s) to achieve 7 tx/s!
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SCALABILITY
30 EH/s (30 x 1018 H/s) to achieve 7 tx/s! ↑ COMPUTATIONAL POWER ⇒ ↓ THROUGHPUT
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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
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