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Update FIPS/fip-randomness.md
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Co-authored-by: Steven Allen <steven@stebalien.com>
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arajasek and Stebalien authored Sep 1, 2023
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## Simple Summary
<!--"If you can't explain it simply, you don't understand it well enough." Provide a simplified and layman-accessible explanation of the FIP.-->

Changes the FVM syscalls that fetch randomness to no longer hash in personalization. Contracts must now do so themselves.
Changes the gas costs of the FVM syscalls that fetch randomness and tipset CIDs to be linearly proportional to how far back the lookback epoch is.
This FIP:

1. Changes the FVM syscalls that fetch randomness to no longer mix-in user provided "entropy", actors must now do so themselves.
2. Changes the gas costs of the FVM syscalls that fetch randomness and tipset CIDs to be proportional to the lookback distance.

## Abstract
<!--A short (~200 word) description of the technical issue being addressed.-->
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