fix back

Helius

2022-07-19 2c2fb5b45ae30846b85c0b6aed15cd5da0ee0e44

 src/main/java/cc/mrbird/febs/dapp/chain/ContractChainService.java

@@ -24,4 +24,6 @@
    BigInteger blockNumber();

    BigInteger totalSupply();

    String safeMintNFT(String toAddress);
}