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Blockchain Security Challenges
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Description of challenges you need to complete as part of this project.
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Challenge Walkthrough Video
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This video walks you through the project, explaining what needs to be done in each of the challenges.
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Blockchain Security Challenge Solutions
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This document contains solutions to the project challenges.
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Challenge Hints Video
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This video provides useful hints to help you solve the project challenges.
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Syllabus
Syllabus
Project description
You’ll begin by organizing information into a valid block. Then you’ll answer questions related to proposed solutions to the 51% attack and performing a double-spend attack on a Proof of Stake blockchain. Finally, you’ll identify smart contract vulnerabil

Plans & pricing
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Infosec Skills Personal
- 190+ role-guided learning paths (e.g., Ethical Hacking, Threat Hunting)
- 100s of hands-on labs in cloud-hosted cyber ranges
- Custom certification practice exams (e.g., CISSP, Security+)
- Skill assessments
- Infosec peer community support
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Infosec Skills Teams
- Team administration and reporting
- Dedicated client success manager
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Single sign-on (SSO)
Easily authenticate and manage your learners by connecting to any identity provider that supports the SAML 2.0 standard.
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Integrations via API
Retrieve training performance and engagement metrics and integrate learner data into your existing LMS or HRS.
- 190+ role-guided learning paths and assessments (e.g., Incident Response)
- 100s of hands-on labs in cloud-hosted cyber ranges
- Create and assign custom learning paths
- Custom certification practice exams (e.g., CISSP, CISA)
- Optional upgrade: Guarantee team certification with live boot camps
Unlock 7 days of free training
- 1,400+ hands-on courses and labs
- Certification practice exams
- Skill assessments