curl --request GET \
  --url https://api.dfns.io/signers \
  --header 'Authorization: Bearer <token>'

{
  "clusters": [
    {
      "clusterId": "<string>",
      "signers": [
        {
          "signerId": "<string>",
          "encryptionKey": "<string>"
        }
      ]
    }
  ]
}