How to sign a transaction using BitcoinJ

I am having problem signing the transaction using BitcoinJ library without the Wallet instance, I only have the Transaction class instance and the ECKey in order to sign the transaction.

Is there a way to implement it ?

How are SIGHASH flags encoded into a signature?

This page describes SIGHASH flags:

OP_CHECKSIG extracts a non-stack argument from each signature it evaluates, allowing the signer to decide which parts of the transaction to sign. Since the signature protects those parts of the transaction from modification, this lets signers selectively choose to let other people modify their transactions.

But how can I extract the SIGHASH flags from the signature?

How to get unspents for a specified bitcoin address?

I want to access unspent data of a specific bitcoin address.

I am trying this command

bitcoin-cli -regtest listunspent “some bitcoin address”

But I am always getting an empty list. I am using local bitcoind server on windows 7.

What should I do or use any function for getting desired output ?

Using Bitcore API for Escrow

Has anyone experience using the Bitcore API for Escrow purposes with node.js?

I assume, you’d need to create a new a address, then somehow create a new transaction using the newly created address, the probe that address for it’s balance until its fulfilled. I’ve had a look over the docs, but couldn’t find anything. Currently you can run bitcoind on a server and connect to this using RPC, but I’d like to try using Bitcore instead but achieve the same result.


Solo Mine with an AntMiner

How do I solo mine with an AntMiner?

AntMiners use cgminer, which certainly supports GBT, but when I use http://<my_local_net_ip>:8332/ and my bitcoind username and password for “Worker” and “Password,” respectively, on the “Miner Configuration” tab of my AntMiner’s page, the AntMiner says my “pool” is dead. bfgminer can connect, via RPC, to my local bitcoind “pool” just fine, so the issue is with AntMiner/cgminer.

About performing SHA-256 hashing on the public key

I am following this link, trying to perform SHA-256 on a given public key.
However, I cannot get the expected result.

I am using the sha256 library in python hashlib

The input is


Mine output is


The expected output on is


Do I miss anything?