No chain selection rule can secure a proof-of-space longest-chain blockchain when honest space varies over time: the attacker wins with a fork of length about phi squared times rho divided by epsilon, and this is tight up to a factor phi.
https://docs.chia.net/files/Precursor-ChiaGreenPaper.pdf (2019), this is an early proposal and differs significantly from the implemented version [1]
1 Pith paper cite this work. Polarity classification is still indexing.
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On the (in)security of Proofs-of-Space based Longest-Chain Blockchains
No chain selection rule can secure a proof-of-space longest-chain blockchain when honest space varies over time: the attacker wins with a fork of length about phi squared times rho divided by epsilon, and this is tight up to a factor phi.