What is the algorithm that adjusts the difficulty of the proof of works in a proof of work based cryptocurrency?

For instance, Bitcoin has a proof of work based consensus algorithm, it’s how Bitcoin chooses a node to create the next block in Bitcoin’s blockchain. In this way the network is in consensus about the creation of the next block. Part of this block creation process is issuing the next proof of work to the…

How to resolve insufficient fund error in ganache in web3j java?

static void test2() throws IOException, ExecutionException, InterruptedException { BasicConfigurator.configure(); Web3j web3a=Web3j.build(new HttpService(“HTTP://127.0.0.1:8545”)); EthAccounts accounts=web3a.ethAccounts().send(); // list all the accounts System.out.println(accounts.getAccounts()); String sendingAddress = “0x5DC18De4028C850A72e41D558B4b34601510424e”; String receivingAddress = “0x5905bA08f544306Bc947E81897daf9A5aE7A8de1”; BigInteger value=new BigInteger(“100”); BigInteger nonce=new BigInteger(“0”); BigInteger gasPrice=new BigInteger(“20000000”); BigInteger gasLimit=new BigInteger(“30000”); Credentials credentials=Credentials.create(sendingAddress); RawTransaction rawTransaction=RawTransaction.createEtherTransaction(nonce,gasPrice,gasLimit,receivingAddress,value); byte[] signedMessage = TransactionEncoder.signMessage(rawTransaction,credentials); String hexValue = Numeric.toHexString(signedMessage); EthSendTransaction ethSendTransaction =…