/* encode an input as P-521 public key */
byte[] encoded = KeyCodec.P521_PUBLIC_KEY.encode(input);

/* encode an input as an identity */
byte[] encoded = MultihashCodec.IDENTITY.encode(input);

/* get decoder instance initialized with all supported codecs */
var decoder = MulticodecDecoder.getInstance();

/* get decoder initialized with codecs tagged as key and hash */
var decoder = MulticodecDecoder.getInstance(Tag.Key, Tag.Hash);

/* get decoder initialized with custom codec set  */
var decoder = MulticodecDecoder.getInstance(codecs...);

/* decode */
byte[] decoded = decoder.decode(encoded);

/* or check if encoding is supported  */
Multicodec codec = decoder.getCodec(encoded).orElseThrow(() -> new IllegalArgumentException("Unsupported codec."));
byte[] decoded = codec.decode(encoded);

/* or directy when only one codec is supported */
byte[] decoded = KeyCodec.P521_PUBLIC_KEY.decode(encoded);

/* check if byte array is encoded with a codec */
if (KeyCodec.P521_PUBLIC_KEY.isEncoded(encoded)) {
  ...
}