adding general fusaka upgrade page#16135
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taxmeifyoucan
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Aug 28, 2025
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| This is the *headliner* of the Fusaka fork, the main feature added in this upgrade. L2s currently post their data to Ethereum in blobs, the ephemeral data type created specifically for L2s. Pre-Fusaka, every full node has to store every **byte of those blobs to ensure that the data exists. As blob throughput rises, having to download all of this data would be untenably resource-intensive. | ||
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| With [Data Availability Sampling](https://notes.ethereum.org/@fradamt/das-fork-choice) , instead of having to download all of the blob data, each node will sample just a portion. Blobs are uniformly randomly distributed across nodes in the network with each full node holding only 1/8th of the data, therefore enabling theoretical scale up to 8x. To ensure availability of the data, Any portion of the data can be reconstructed from any existing 50% of the whole with methods that drive down the probability of wrong or missing data to a cryptographically negligible level (~one in 10²⁰ to one in 10²⁴). |
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| With [Data Availability Sampling](https://notes.ethereum.org/@fradamt/das-fork-choice) , instead of having to download all of the blob data, each node will sample just a portion. Blobs are uniformly randomly distributed across nodes in the network with each full node holding only 1/8th of the data, therefore enabling theoretical scale up to 8x. To ensure availability of the data, Any portion of the data can be reconstructed from any existing 50% of the whole with methods that drive down the probability of wrong or missing data to a cryptographically negligible level (~one in 10²⁰ to one in 10²⁴). | |
| With [Data Availability Sampling](https://notes.ethereum.org/@fradamt/das-fork-choice), instead of having to download all of the blob data, each node will sample just a portion. Blobs are uniformly randomly distributed across nodes in the network, with each full node holding only 1/8th of the data, therefore enabling a theoretical scale up to 8x. To ensure availability of the data, it's represented by a polynomial with a cryptographic proof that enables reconstruction of any piece of the original data from only 50% of available blobs using erasure coding. |
Co-authored-by: Mário Havel <61149543+taxmeifyoucan@users.noreply.github.com>
Co-authored-by: Mário Havel <61149543+taxmeifyoucan@users.noreply.github.com>
nixorokish
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corwintines,
minimalsm,
pettinarip and
wackerow
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corwintines
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Aug 28, 2025
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corwintines
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corwintines
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Thanks @nixorokish!
I have a couple suggestions just to simplify a bit, or make easier for translations. Let me know what you think :D
lgtm! tysm for reviewing! Co-authored-by: Corwin Smith <cssmittys@gmail.com>
corwintines
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Aug 29, 2025
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Thanks @nixorokish! This is great, appreciate it |
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This was referenced Sep 29, 2025
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Description
this adds a Fusaka folder in the roadmap and creates an index.md with general explanations about the upgrade. Will need a subpage for PeerDAS at minimum with more in-depth plain language specs