type_url: "type.googleapis.com/google.crypto.tink.EcdsaPrivateKey"
# value: [type.googleapis.com/google.crypto.tink.EcdsaKeyFormat] {
#   params {
#     hash_type: SHA512
#     curve: NIST_P521
#     encoding: DER
#   }
# }
value: "\022\006\010\004\020\004\030\002"
output_prefix_type: TINK
