public PreparedCertificate getPreparedCertificate() {
    return new PreparedCertificate(
        proposal.getSignedPayload(),
        prepares.stream().map(Prepare::getSignedPayload).collect(Collectors.toList()));
  }
Gets prepared certificate.

@return the prepared certificate
consensus/ibft/src/main/java/org/hyperledger/besu/consensus/ibft/statemachine/PreparedRoundArtifacts.java