In our solochain currently our chain using POA. Now we want to update the consensus to Delegated Proof of Stake(with AURA). Do we have any reference or suggestion for that implementation?

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You can also check out this https://github.com/darwinia-network/darwinia/blob/main/pallet/staking/src/lib.rs.

This is our staking pallet, which is used in a parachain but does not rely on any parachain component. It can be easily transferred to a solo chain. Additionally, I have recently extracted the inflation logic, making it much simpler for you to apply your own inflation logic. Check it out here: https://github.com/darwinia-network/darwinia/pull/1310.

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