public String toBase58() {
       byte[] data = new byte[25];
       data[0] = COIN_VERSION;
       System.arraycopy(toArray(), 0, data, 1, 20);
       byte[] checksum = Digest.sha256(Digest.sha256(data, 0, 21));
       System.arraycopy(checksum, 0, data, 21, 4);
       return Base58.encode(data);
   }

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