Study Notes｜Data Availability
① Ethereum’s Fusaka upgrade in December 2025 introduced PeerDAS, so nodes don’t need to download the full blob data; they can confirm data availability by sampling a portion of it.
② DAS is usually used together with erasure coding: data is encoded into a redundant version, and the full dataset can be recovered as long as a sufficient proportion of the chunks is available.
③ When you see a chain claiming to offer “ultra-low costs,” first ask where its transaction data is stored and who guarantees it can be downloaded.
$TIA 0.6025 (+23.67%)
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① Ethereum’s Fusaka upgrade in December 2025 introduced PeerDAS, so nodes don’t need to download the full blob data; they can confirm data availability by sampling a portion of it.
② DAS is usually used together with erasure coding: data is encoded into a redundant version, and the full dataset can be recovered as long as a sufficient proportion of the chunks is available.
③ When you see a chain claiming to offer “ultra-low costs,” first ask where its transaction data is stored and who guarantees it can be downloaded.
$TIA 0.6025 (+23.67%)
#TIA