0x4d21fcce817355dfcc792b07a57fc48b818e8a8a

An Ethereum validator’s withdrawal credentials are 32 bytes: a one-byte prefix, eleven zero bytes, then a twenty-byte execution address. Prefix 0x01 and 0x02 carry one; 0x00 is a BLS key with no execution address in it at all, and reading its last twenty bytes would produce an address that looks real and belongs to nobody.

The operator is named only where the address is a publicly documented protocol contract, with a link to the documentation. An explorer’s label is not enough: those are crowd-sourced, and attaching one here would publish a claim about who controls a large share of the stake on the basis of a wiki edit.