Study Notes | Data Availability
① Ethereum’s December 2025 Fusaka upgrade introduced PeerDAS, so nodes don’t need to download the complete blob data; they can confirm data availability by sampling a portion.
② Data availability means that all transaction data in a block has actually been published and can be downloaded by anyone who wants to verify it.
③ When comparing Layer 2 solutions, pay attention to where transaction data is published: Ethereum, an independent data availability network, or an off-chain committee. The security assumptions differ.
$TIA 0.4258（+0.14%）
① Ethereum’s December 2025 Fusaka upgrade introduced PeerDAS, so nodes don’t need to download the complete blob data; they can confirm data availability by sampling a portion.
② Data availability means that all transaction data in a block has actually been published and can be downloaded by anyone who wants to verify it.
③ When comparing Layer 2 solutions, pay attention to where transaction data is published: Ethereum, an independent data availability network, or an off-chain committee. The security assumptions differ.
$TIA 0.4258（+0.14%）