@java.lang.Override
    public com.google.protobuf.ByteString getHashPrefix() {
      return hashPrefix_;
    }
<pre>
A hash prefix, consisting of the most significant 4-32 bytes of a SHA256
hash. For JSON requests, this field is base64-encoded.
Note that if this parameter is provided by a URI, it must be encoded using
the web safe base64 variant (RFC 4648).
</pre>

<code>bytes hash_prefix = 1;</code>

@return The hashPrefix.
java-webrisk/proto-google-cloud-webrisk-v1/src/main/java/com/google/webrisk/v1/SearchHashesRequest.java