I noticed that the pallet_randomness_collective_flip has been removed in polkadot-v0.9.39, why is this?
What are the alternatives?
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It was renamed to
pallet-insecure-randomness-collective-flip in substrate#13301 to clarify that it is not secure. There were indications that developers used this in production to generate random numbers for security relevant decisions.
The pallet was never intended for that, so we felt prompted to communicate this in a breaking way (by renaming the crate). As of today, there are no secure alternatives that i know of.