Ethereum mainnet staking withdrawals will be activated on April 12th 2023
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For reference, 6,209,536 is the slot that the Shanghai/Capella (a.k.a. Shapella) network upgrade will happen on mainnet, which enables withdrawals. With proof-of-stake, network upgrades can be configured to occur at specific times. Shanghai/Capella are the names of the execution layer and consensus layer specifications, respectively.