First, understand a few things:
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Every identity has a unique did (distributed identifier) that looks like this:
did:plc:cbkjy5n7bk3ax2wplmtjofq2
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You can alias a domain to your did.
dig +short TXT _atproto.ngerakines.me "did=did:plc:cbkjy5n7bk3ax2wplmtjofq2"