# \#proof-of-space

**URL:** https://forum.autonomys.xyz/tag/proof-of-space/42.md

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## [Why can't Subspace have Chia-like "filter"?](https://forum.autonomys.xyz/t/why-cant-subspace-have-chia-like-filter/2074)

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**Author:** [@nazar-pc](https://forum.autonomys.xyz/u/nazar-pc)\
**Replies:** 9\
**Last updated:** [November 5, 2023, 6:15pm UTC](https://forum.autonomys.xyz/t/why-cant-subspace-have-chia-like-filter/2074 "2023-11-05T18:15:29Z")

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It is not very intuitive to me right now why we have to audit all sectors. IIRC there are some attacks that would be possible if we skip sectors according to some criteria, however wouldn’t that also cause issues for Chi…

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## [Proof of space performance improvements by sharing tables between pieces](https://forum.autonomys.xyz/t/proof-of-space-performance-improvements-by-sharing-tables-between-pieces/1585)

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**Author:** [@nazar-pc](https://forum.autonomys.xyz/u/nazar-pc)\
**Replies:** 29\
**Last updated:** [August 10, 2023, 8:58am UTC](https://forum.autonomys.xyz/t/proof-of-space-performance-improvements-by-sharing-tables-between-pieces/1585 "2023-08-10T08:58:35Z")

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I’ve been hacking intensively on Chia again last week and got some decent progress, but there is one thing that bothers me. Since we need a table for each piece, on commodity hardware performance looks like “seconds per…

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## [Replace first block zeroes with pseudo-random data](https://forum.autonomys.xyz/t/replace-first-block-zeroes-with-pseudo-random-data/1498)

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**Author:** [@nazar-pc](https://forum.autonomys.xyz/u/nazar-pc)\
**Replies:** 1\
**Last updated:** [May 15, 2023, 8:18am UTC](https://forum.autonomys.xyz/t/replace-first-block-zeroes-with-pseudo-random-data/1498 "2023-05-15T08:18:55Z")

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Fix polynomial normalization by nazar-pc · Pull Request #1454 · subspace/subspace · GitHub reminded me that we should probably replace zeroes in the genesis block with pseudo-random data instead. Not sure if those zeroes…

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## [Performance of chia proof of space re-implementation in Rust](https://forum.autonomys.xyz/t/performance-of-chia-proof-of-space-re-implementation-in-rust/1478)

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**Author:** [@nazar-pc](https://forum.autonomys.xyz/u/nazar-pc)\
**Replies:** 2\
**Last updated:** [May 12, 2023, 7:53pm UTC](https://forum.autonomys.xyz/t/performance-of-chia-proof-of-space-re-implementation-in-rust/1478 "2023-05-12T19:53:10Z")

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Still not working quite correctly, but re-implementation of chiapos in Rust is faster. Specifically, ~175ms for k17, a few ms faster than first phase in C++ chiapos + we don’t do other phases. k16 goes down do ~91ms. P…