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A curated list of blockchain security Wargames, Challenges, and Capture the Flag (CTF) competitions and solution writeups.
Blocksec CTFs
Card addresshttps://mdrss.com/crypto/payments/1474
Canonical Markdownhttps://mdrss.com/crypto/payments/1474/1474.md
Snapshot 2026-08-03 23:56:39 UTC · version 1
INDEXABLE MARKDOWN SNAPSHOT
Research document
Blocksec CTFs
A curated list of blockchain security Wargames, Challenges, and Capture the Flag (CTF) competitions and solution writeups.
Wargames and Writeups
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- Ethernaut CTF Solution by 0xIchigo
- Ethernaut-CTF Solutions using Ape and Vyper by 0xJCN
- Ethernaut CTF Series - All Things Security - Solutions in Solidity and Foundry by Aditya Dixit
- Ethernaut Solutions by Aniket21mathur - Challenges 0-25
- Ethernaut Solutions by cmichel - Challenges 0-21
- Ethernaut Writeups by Macmod - Challenges 0-9
- Ethernaut Solutions by tsauvajon - Challenges 1-11
- Ethernaut Solutions by tinchoabbate
- The Ethernaut CTF Writeup by Arseny Reutov - Challenges 0-6
- Ethernaut Lvl 0 Walkthrough: ABIs, Web3, and how to abuse them by Nicole Zhu
- Ethernaut Lvl 1 Walkthrough: how to abuse the Fallback function by Nicole Zhu
- Ethernaut Lvl 2 Fallout Walkthrough: how simple developer errors become big mistakes by Nicole Zhu
- Ethernaut Lvl 3 Coin Flip Walkthrough: how to abuse psuedo randomness in smart contracts by Nicole Zhu
- Ethernaut Lvl 4 Telephone Walkthrough: how to abuse tx.origin & msg.sender by Nicole Zhu
- Ethernaut Lvl 5 Token Walkthrough: How to abuse arithmetic underflows and overflows by Nicole Zhu
- Ethernaut Lvl 6 Delegation Walkthrough: How to abuse the delicate delegatecall by Nicole Zhu
- Ethernaut Lvl 7 Force Walkthrough — How to selfdestruct and create an Ether blackhole by Nicole Zhu
- Ethernaut Lvl 8 Vault Walkthrough — How to read “private” variables in contract storage (with Truffle) by Nicole Zhu
- Ethernaut Lvl 9 King Walkthrough: How bad contracts can abuse withdrawals by Nicole Zhu
- Ethernaut Lvl 10 Re-entrancy Walkthrough: How to abuse execution ordering and reproduce the DAO hack by Nicole Zhu
- Ethernaut Lvl 11 Elevator Walkthrough: How to abuse Solidity interfaces and function state modifiers by Nicole Zhu
- Ethernaut Lvl 12 Privacy Walkthrough: How Ethereum optimizes storage to save space and be less gassy by Nicole Zhu
- Ethernaut Lvl 13 Gatekeeper 1 Walkthrough: How to calculate smart contract gas consumption (and byte masking) by Nicole Zhu
- Ethernaut Lvl 14 Gatekeeper 2 Walkthrough: How contracts initialize (and how to do bitwise operations) by Nicole Zhu
- Ethernaut Lvl 15 Naught Coin Walkthrough: How to abuse ERC20 tokens and bad ICOs by Nicole Zhu
- Ethernaut Lvl 16 Preservation Walkthrough: How to inject malicious contracts with delegatecall by Nicole Zhu
- Ethernaut Lvl 17 Locked Walkthrough: How to properly use (and abuse) structs in Solidity by Nicole Zhu
- Ethernaut Lvl 18 Recovery Walkthrough: How to retrieve lost contract addresses (in 2 ways) by Nicole Zhu
- Ethernaut Lvl 19 MagicNumber Walkthrough: How to deploy contracts using raw assembly opcodes by Nicole Zhu
- Ethernaut Challenges solutions by Asamartino - Challenges (0-21)
- Ethernaut Challenges solutions by Simon - Challenges (0-21)
- Ethernaut: Lvl 22 Dex - Writeups by thispost
- Ethernaut: Lvl 23 Dex Two - Writeups by Naveen
- Ethernaut: Lvl 24 Puzzle Wallet - Writeups by Lamby
- Ethernaut: Lvl 25 Motorbike - Writeups by Lamby
- Ethernaut: Lvl 26 DoubleEntryPoint - Writeups by D-Squared
- Ethernaut Lvl 27 Good Samaritan Walkthrough: Custom Errors in Solidity by Chirag Agarwal
- Ethernaut CTF Level 0 by D-Squared
- Ethernaut CTF Level 1 by D-Squared
- Ethernaut CTF Level 2 by D-Squared
- Ethernaut CTF Level 3 by D-Squared
- Ethernaut CTF Level 4 by D-Squared
- Ethernaut CTF Level 5 by D-Squared
- Ethernaut CTF Level 6 by D-Squared
- Ethernaut Brownie Solutions by ptisserand
- Ethernaut Truffle Solutions by tincho
- Ethernaut Hardhat Solutions by MrToph
- Ethernaut-x-Foundry Solutions by ciaranmcveigh5
- Ethernaut CTF - Foundry Edition by StErMi
- Ethernaut x Foundry - 0x0 Hello Ethernaut by 0xeval
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- Damn Vulnerable DeFi - Foundry by alexbabits
- Damn Vulnerable DeFi - Foundry edition by nicolasgarcia214
- Damn Vulnerable DeFi - Foundry edition Challenge Solutions #1 to #12 on Medium.com by StErMi
- DamnVulneraDeFi Solutions using Ape and Vyper by 0xJCN
- DamnVulnerableDefi ABI smuggling challenge walkthrough (plus infographic) by ᴍatías Λereal Λeón
- Damn Vulnerable DeFi Solutions by cmichel
- Write-ups and lessons learned from Damn Vulnerable #DeFi by Damian Rusinek
- Damn Vulnerable DeFi — Setup and Challenge #1 Walkthrough by iphelix
- Damn Vulnerable DeFi — Challenge #2 Walkthrough by iphelix
- Damn Vulnerable DeFi — Challenge #3 Walkthrough by iphelix
- Damn Vulnerable DeFi — Challenge #4 Walkthrough by iphelix
- Damn Vulnerable DeFi — Challenge #5 Walkthrough by iphelix
- Damn Vulnerable DeFi — Challenge #6 Walkthrough by iphelix
- Damn Vulnerable DeFi — Challenge #7 Walkthrough by iphelix
- Damn Vulnerable DeFi — Challenge #8 Walkthrough by iphelix
- Damn Vulnerable DeFi Video Solutions by Smart Contract Programmer
- Damn Vulnerable DeFi v2 - part #1: Setup and Challenges 1 to 4 by patrickd
- Damn Vulnerable DeFi V2 - #5 The Rewarder by patrickd
- Damn Vulnerable DeFi V2 - #6 Selfie by patrickd
- Damn Vulnerable DeFi V2 - #7 Compromised by patrickd
- Damn Vulnerable DeFi V2 - #8 Puppet by patrickd
- Damn Vulnerable DeFi V2 - #9 Puppet V2 by patrickd
- Damn Vulnerable DeFi V2 - #10 Free Rider by patrickd
- Damn Vulnerable DeFi V2 - #11 Backdoor by patrickd
- Damn Vulnerable DeFi V2 - #12 Climber by patrickd
- Damn Vulnerable DeFi V2 - #13 Junior Miners by patrickd
- Damn Vulnerable DeFi V2 - #15 ABI Smuggling by Pranav Garg
- Damn Vulnerable DeFi V3 Solutions by Blue Addler
-
- Numen Cyber CTF Writeups
- 2023 NUMEN CTF Writeup - GOATFinance by SunWeb3Sec
- 2023 NUMEN CTF Writeup - Asslot, Counter, Exist, LenderPool, Wallet by SunWeb3Sec
- 2023 NUMEN CTF Writeup - HEXP by SunWeb3Sec
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- Mr Steal Yo Crypto Primer & Hints by 0xToshii
- Mr Steal Yo Crypto Foundry by 0xToshii
Security Innovation Blockchain CTF
- Security Innovation Blockchain CTF Solutions by Narendra Patel
-
- Sherlock Writeup by Razzor
-
- Curta CTF Sudoku solution using Halmos by karma.
- Puzzle #3 by Convergence Boy.
MEV-Share CTF 2023
- MEV-Share CTF Writeups by minaminao
Challenges and Writeups
SmartSecRiddles by marjon-call
[Project SEKAI CTF 2023]
- Project SEKAI CTF 2023 Re-Remix Writeup by minaminao.
-
- Doves in the wind solution by Oren Yomtov.
Code is Law 1 by Oren Yomtov.
Code is Law 2 by Oren Yomtov.
-
- Dragonfly CTF Solutions
- PuzzleBox CTF by smitrajput
Huff Puzzles by RareSkills.
HappyNewYearCTF by Convergence Boy
- Making of HappyNewYear CTF Puzzle by Convergence Boy
-
- Solution by Plotchy.
CTF Lending by MrToph
-
- EthernautDAO Solutions using Ape and Vyper by 0xJCN
- List of all challenges and solutions
- List of challenges with solutions and writeups from beskay
- CTF Level 1: PrivateData - Writeup by Giovannidisiena.eth
- CTF Level 2: Wallet - Writeup by StErMi
- CTF Level 3: Car Market - Writeup by StErMi
- CTF Level 4: Vending Machine - Writeup by StErMi
- CTF Level 6: Hackable Contract - Writeup by StErMi
- CTF Level 8: VNFT - Writeup by beskay
- CTF Level 9: EtherWallet - Writeup by beskay
- CTF Level 10: Vault - Writeup by beskay
- CTF Level 11: Staking - Writeup by beskay
-
- A-MAZE-X CTF Walkthrough | Part I by Matias
- A-MAZE-X CTF Walkthrough | Part II by Matias
- A-MAZE-X CTF Walkthrough | Part III by Matias
- A-MAZE-X CTF Walkthrough | Part IV by Matias
-
- Secureum A-MAZE-X Stanford CTF by patrickd
Secureum Bootcamp
- RACE #13 Of The Secureum Bootcamp Epoch∞ by patrickd
- RACE #14 Of The Secureum Bootcamp Epoch∞ by patrickd
Immunefi Community Challenges by Immunefi
EVM puzzles by fvictorio
- Learning Ethereum Virtual Machine Opcodes With EVM Puzzles by patrickd
- EVM Puzzles – Second Wind by patrickd
- Let’s play EVM Puzzles — learning Ethereum EVM while playing!
- Solving more-evm-puzzles differently? | Part I by Matias
- Solving more-evm-puzzles differently? | Part II by Matias
- Yet another evm puzzle by Matias
- Write-ups for yet another EVM puzzle1 by 0xNorman
- Write-up for yet another EVM puzzle2 by 0xNorman
- Write-up for yet another EVM puzzle3 by 0xNorman
- Write-up for yet EVM puzzle4 by 0xNorman
- Write-up for yet another EVM puzzle5 by 0xNorman
-
- Solutions - Part 1 by patrickd
- Solutions - Part 2 by patrickd
Solana Security Workshop by Neodyme
- Solution by Christoph Michel
Interview Contracts by Halborn
Pinball Challenge by samczsun
Break My Contract, Steal My Money Challenges
Hacking smart contracts for fun and profit by István András Seres
CTFs and Writeups
-
- GPN CTF 2023 writeup by Kaiziron
-
- SEETF 2023 Writeup by minaminao
- SEETF 2023 writeup by Kaiziron
- SEETF 2022 Write List
-
- LA CTF 2023 Writeup by Kaiziron
Paradigm CTF 2022 - 2022
- Community Solutions:
- Paradigm CTF 2022 Write-up by The Duck (Theori)
- Statemind's solutions(11 solved)
- Paradigm CTF 2022 Writeup by Inspex
- minaminao solutions
- Kaiziron solutions
- Paradigm CTF 2022: Write-Up Collection
- Paradigm CTF 2022 - Electric Sheep by patrickd
- Paradigm CTF 2022 - Trapdooor & Trapdoooor by patrickd
- 0xMonaco writeup by brock
- 0xMonaco #1 place writeup by Oage
- 0xMonaco writeup by Abdulla
- 0xMonaco exploit by Brock Elmore
- Unlocking the Lockbox2 by Soham Zemse
- Vanity by Daniel Von Fange
- Merkledrop and Vanity by iFrostizz
- PARADIGM CTF 2022 Question Analysis 1 — RESUCE by Numen Cyber Labs
- PARADIGM CTF 2022 Question Analysis 2 — Source Code Analysis by Numen Cyber Labs
- PARADIGM CTF 2022 Question Analysis 3 - Lockbox2 Analysis by Numen Cyber Labs
- PARADIGM CTF 2022 Question Analysis 4 -MerkleDrop by Numen Cyber Labs
- Electric Sheep - Stealing gas tokens from the GSN-enabled MultiSig by Decurity
- Community Solutions:
Paradigm CTF - 2021
- Official Challenges and Solutions:
- Community Solutions:
- Paradigm CTF 2021 Solutions and Github repo by cmichel
- BabyRev and Upgrade Solutions by Ansgar Dietrichs
- [Paradigm JOP Solution on Twitch Part 1 and Part 2 by Ansgar Dietrichs
- Paradigm CTF 2021 Solutions by thegostep
- BabyCrypto, BabySandbox, and Lockbox writeups by roynalnaruto
- BabyCrypto Challenge by Team Dilicious (Sam Wilson)
- Broker Challenge by Team Dilicious (Sam Wilson)
- BabyRev Challenge by Team Dilicious (Sam Wilson)
- Bank Challenge by Team Dilicious (smarx)
- Vault Challenge by Team Dilicious (smarx)
- Paradigm CTF Solutions by Furucombo
- Swap Challenge by samczsun
- Solutions by patrickd
0xPOLAND - 2020
AnChain CTF - 2020
Sharky CTF - 2020
- Sharky CTF: Blockchain Level 0 to 4 Writeup by Nithilan Pugal
- Sharky CTF Blockchain Challenges by Imagin
Donjon CTF - 2020
Chain Heist - 2019
Capture the Coin - 2019
- “Capture the Coin” at Defcon and you could win big
- How the Coinbase Security team deployed CTFd to Power our First Capture the Flag contest at Defcon 27
- Congratulations Capture the Coin participants!
- Capture the Coin — Trivia Solutions
- Capture the Coin — Blockchain Category Solutions
- Capture the Coin — Cryptography Category Solutions
- Capture the Coin CTF write-up by Arpox
Code Blue PolySwarm Challenge - 2018
- PolySwarm Smart Contract Hacking Challenge Writeup by Arseny Reutov
Real World CTF (Acoraida Monica Challenge) - 2018
- Challenge files and Solution by LiveOverflow
- Ethereum Smart Contract Code Review #1 - Real World CTF 2018 by LiveOverflow
- Jump Oriented Programming: Ethereum Smart Contract #2 - Real World CTF 2018 by LiveOverflow
- Ethereum Smart Contract Backdoored Using Malicious Constructor by LiveOverflow
Authio Solidity CTF
- Challenges:
- Solidity CTF - Part 1: "Function Types
- Solidity CTF — Part 2: “Safe Execution”by Alexander Wade
- Solidity CTF — Part 3: “HoneyPot” by Alexander Wade
- Solidity CTF — Part 4: Read the Fine Print by Alex Towle
- Solidity CTF - Part 5: Mirror Madness by Paul Vienhage
ZeroNights ICO Hacking Contest - 2017
- ZeroNights ICO Hacking Contest Writeup by Arseny Reutov
MARKDOWN METRICS
2207words
4headings
321links
0code blocks
MDRSS ASSESSMENT
Evidence46/100medium confidence
Why MDRSS assigned this score
- Production catalog audit 2026-08-04
- Taxonomy classified from title, annotation, source and Markdown signals
- Agent usefulness evaluated from structure, procedures, examples, evidence and retrieval value
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