Is there a formula to determine the maximum number of public keys (wallets) in the Ethereum universe?


Realistically a wallet is an address, not a public key, and you control that wallet by having a private key that maps to the address. An address is 20 bytes (2^160 possible addresses) and a private key is 32 bytes (2^256 possible keys).

This could very well expand when sharding is introduced, since each shard will have its own account space.


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