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[[atproto-did-document.md]]
The public signing key for the account is found under
the verificationMethod array, in an object with id ending #atproto,
the controller matching the DID itself, and type matching the fixed
string "Multikey". The publicKeyMultibase field will be the public key
in multibase encoding.
IMPORTANT
A valid signing key is required for atproto functionality. An account with no valid key in their DID document is broken.