@Override
  public String toString() {
    return "ForkchoiceEvent{"
        + "headBlockHash="
        + headBlockHash
        + ", safeBlockHash="
        + safeBlockHash
        + ", finalizedBlockHash="
        + finalizedBlockHash
        + '}';
  }
Gets safe block hash.

@return the safe block hash
ethereum/eth/src/main/java/org/hyperledger/besu/consensus/merge/ForkchoiceEvent.java