Clear it in 3 steps
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Start the environment
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Investigate the target
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Submit the flag
All challenges
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Programming - Blockchain Event Reassembly
Mission
blocks.json is generated from the FLAG injected at startup. Filter FlagFragment events with topic 0xfeedface, order by index, and hex-decode to recover the flag.
Hints
Hint 1 Show
Inspect blocks.json and identify the target record
Hint 2 Show
filter FlagFragment events with topic 0xfeedface, order by index, and hex-decode
Hint 3 Show
Verify that the reconstructed value has FLAG{...} format