Bitcoin Forum

Having done a search i couldn't find a thread on building your own blockchain.

Granted, i did search on google and found a fantastic tutorial on Hackernoon by Daniel van Flymen, so full credit to him and the awesome Hackernoon website.

I am currently finishing a virtual box image that i will upload to google drive for those who want a ready running setup, ready to mine their own genesis block.

For those who want to do it themselves, go here and enjoy https://hackernoon.com/learn-blockchains-by-building-one-117428612f46

You will need to have some general knowledge on how to use an IDE such as Wings or Codeblocks and Python. You will be using Python for the blockchain.

If you do get struck go to Daniels github repo which is referenced in the tutorial and check out the readme file.

I did note that there were some linearity issues with the instructions but some persistence paid off.

I tripped thorugh the pipenv initialization and the initial POSTman initial transaction command. It was a bit confusing but again i persisted and have built 2 blockchains for my colleagues at work.

I intend to use this example to track completion certificates in my own project.

i found this tutorial quite empowering and the catalyst for my own projects for the future.

Feel free to ask any questions, and i am thinking about making my own tutorial here with more detail for the beginner.

I am confident anyone can do this.

Enjoy.

VBox image link coming soon.

UA

And for those that prefer Golang, here is a more complete guide (https://jeiwan.cc/tags/blockchain/) that'll help you build your own blockchain from scratch. IMO It is really a must read as it covers deeper things then other guides.

How long does it take to make own blockchain?? and beginner is also easy to do it?

Building a blockchain could look like not a complex task, but the evil is in the details.

You can roll out something  looking like a working blockchain in a month or so, but many questions appear before real production launch:

1. whats the algorithm - PoS, PoW?
2. if PoW, what's it - sha256, cryptonote, egalitarian algorithms, ASIC friendly or not?
3. if PoS what kind of - DPoS, NXT-like, PBFT (Tendermint), Algorand, etc?
4. whats the money  supply?
5. if PoS, how to distribute - give to Bitcoin holders, Ethereum holders, give to random people by captcha, give to Bitcointalk members by rank, give for investors only on ICO, how many to keep to yourself?
6. whats the format of address, is it possible to use passphrase, is it digits only to simplify use for enter, whats with control sum to prevent error during input?
7. wallets - mobile version, desktop version, should it be cross-platform, what framework to use if so (qt has quite not really modern L&F, Atom is slow, Java is memory hungry)

...

345. Probably we better go with a fork?

Yes, i would to some degree consider myself a beginner when it comes to blockchains, possibly most of use here too.

This tutorial gives you an example of how a basic blockchain works with a novice approach.

The python code can be confusing or intimidating but his tutorial breaks it down a bit.

I entered this with a noob mindset and in a few hours created and mined my first genesis block.

I watched a few youttube clips but settled for this tutorial in the end.

Hi,

safety is not an issue with this tutorial,are you comfortable using the command line prompt window?

this is based on using a windows 7 64 bit vm / pc /laptop.

It's better to fork an existing coin rather than staring your brand new blockchain. I advise you to choose a PoS coin as it's way easier to manage, run nodes etc. Otherwise you will need to have miners to verify transactions, sync blockchain etc.

The point of coding your own blockchain is not to lunch your next altcoin and try to get rich of it. As blockchains can be used for all different sorts of things you can play by building one. By following such tutorials it can help you develop the coding skills or even sharpen the existing ones. It is not all about creating the next altcoin, but for educating purposes to see how this structure work. It can be complex task, but while learning you want something simple to see how it works and ways how it is implemented and understand the core principles behind it.

You could also want to build some small centralized blockchain for your small project or even of some company, limitations are endless. Building blockchain is not strictly tied to building next altcoin as money is just one application that can be built on top of it.

This is my exact intention of this tutorial.

Spot on.

There is far more to the Blockchain than $$$ the immutability in itself is the key to innovation and further development of it.

The more we can get at this grass roots level the better the next and current generation can understand it.

That is what I have been looking for, thanks friend. I am very curious about Blockchain and how to build my own.

I am having an issue with my drive storage but have created my own quick guide which is pretty accurate.

https://drive.google.com/open?id=17c8hXEo6wLg_26Pvee_abobCqtOEbvdT

i have followed this as i created another blockchain for someone using the tutorial and its spot on.

Thanks again to Hackernoon and Daniel for this

A very usefull tutorial. Does it work in osx too?  :)

Kind regards

Thanks for the thread and link OP as this is something I have becoming interested in the last few months.



I would like to explore the possibilities of this more. Have you any examples of an application using a small centralized blockchain? I am building an application on Python which I would like to incorporate with blockchain somehow. I don't have a clue how to do it at this stage but each day I get a clearer picture.

I imagine someone on github or the google universe may have made a port for osx

This is only currently for Windows 7+ sorry mate.

How long does it take to make own blockchain?? and beginner is also easy to do it?

I am using this as basic tracking of certificates of completion for an education and training system i am working on.

I am basically just storing the cert hash on the blockchain. That certificate hash is made up of the users details then added to the chain.

The next step is auto integration where when a user completes the training in that very instance it is added to the chain instantly. Small steps but i find blockchain and DLTs fascinating, hence being here.

I believe with a determined mindset and persistence, you could do it. How long is dependant on how familiar you are with the items in the tutorial.

The link is my version of the tutorial for the beginner i suppose.

If you arent familiar with any aspect of the tutorial i suggest researching and practice before attempting it.

Not many people like the command line aspect, some dont like the API aspect. My sentiment is dont let the unknown defeat you, attempt learn what you dont know now and ease into it. Its how most / every person learns new things.

I know we have an enormous experience base here on bitcointalk.org so i plead with more advanced users not to berate or flame newbies. I welcome them as thats how i started myself.

Good luck and remember if you are really determined you will accomplish most things, if not all things you are passionate about.

So would it be possible to use blockchain to record that someone has done a task like, say, listened to a piece of music, and then they are sent tokens for completing it? Obviously you wouldn't be able to tell if they went out and let it play but just confirm the fact that they have played it through.


This is very good advice. I'm only learning coding languages to varying degrees the last 3 years. Recently I had to make a few tutorials on using command screen and lost the fear of the unknown aspect of it after going through the whole process myself. I learn best by doing and googling along the way. I've started learning Python and finding it a lot easier after learning other languages through seeing familiar phrases and structure. When I do start focusing on blockchain I'm not going to be as wary going into learn it now because I know it can be done with time and research.

most certainly however your context may differ from others as to how the blockchain is used.

if the piece of music contained a certain note structure where there was 1 answer to the question, the answer could be hashed so as not to give away the text based answer. this answer would be published on the blockchain for all to see wet her it was correct or not.

your other method of reward would be a payment ledger which is what our beloved bitcoin is, its a DL of payment transactions.

not sure how you would implement it in your case to record and answer and issue a payment but i guess it could be possible.

My use is not so complex its just a ledger of users issued certificate.

I believe Lightning Network derived HTLC or hash time-locked contracts could do this, however it in itself is complex.

In a nutshell it involves 2-3 parties that have a hash of their own and each user adds their hash to complete the transaction based on another users hash. Within this contract there is a condition to be met, in your case it could be that their answer must equal the same hash and thus the correct hash answer releases a reward. Their is also a time component where if the user fails to meet the hash outcome within a specified time the reward is cancelled, or if someone cheats they are forfeited. Again this is just my gleaned and brief understanding.

I am still in the early days of LN and HTLC, but its something i am currently setting up. I am working on my own LN channel as i type.

Lots to learn and we are still in the early days of Bitcoin derived blockchain and DLT. Have fun.

Thanks a lot uartasic, some nice food for thought there. HTLC process is very interesting and I will look into it more tomorrow. Lots of questions related to this but as I'm just developing an idea I need to work out the questions related to it without sharing too much on a public forum.

I will recommend another also "The authoritative guide to blockchain development" by Haseeb Qureshi. This is also very detailed and informative. This is must read for any blockchain enthusiast.
https://medium.freecodecamp.org/the-authoritative-guide-to-blockchain-development-855ab65b58bc


It will take your comment as a sarcasm :)

Building a blockchain does not really mean creating a new digital currency. It distributed ledger or no centralized storage practically there could be thousands of scenarios where Blockchain could be successful. Big firms like PwC, Deloitte, and KPMG are all testing private blockchains.

So learning or developing a blockchain is not like creating a altcoin,  may be it help you find a new career. Possibilities in blockchian are endless.

How much long does it take to make own blockchain?
 and beginner is also easy to do it?

I know for fact that Deloitte have 2 specialists in Australia for DLT / Blockchain and a dedicated team.

Please take look at my google drive link and the document within with pictures and step by step.

I am not sure i can make it simpler.

I actually created my own very basic blockchain tonight.. took me like 20 hours straight to get the foundation ready. I wrote it from scratch in Java, a PoW kind of blockchain.

I gotta say, your brain really gonna hurt when it comes to the networking (peer-to-peer) part.. that was a pain in the ass! That took like 70% of all my time to figure out. Now my blockchain can send coins, mine blocks, reset/resync the whole blockchain from another node-peer if it's invalid/broken etc.

But there's still ALOT left todo, believe me. I haven't figured out how to fix the Difficulty alghoritm yet.. I just made it fixed at Difficulty 4 at the moment.

I just did it for education purposes, I have another project in mind that actually don't involve cryptocurrency.. but it needs a blockchain to run on. So I started off small to get a grasp on how a blockchain actually work from the ground up. Im just amazed how the ethereum crew manage to do what they do.. :o

I could knock up a block-chain from scratch in under three hours and if you look on Youtube then someone gives an example of the
stub code that is only about 50 lines long.

Now to turn that into my "Own" coin, deploy and test on a network it would take me about .........................
......................... five years at a guess after nicking part of the encryption code and a few other bits.

Running a macro inside Microsoft's Excel does not mean you programmed the darn thing, your just a user, not
even a script kiddie writing VBA but if your just after a alt-coin then best check out ETH and pay them gas to host it for you.

How far did you go past adding hash codes to a linked list ?

Did you turn the transactions into skinned out objects with methods or did you simply store LIST<T> or string arrays to represent the transactions
and did you get the list to persist itself to file storage ?

Running SHA256 to represent PoW and double hashing the hash-codes as taken from Bit-Torrent should not had taken too long so did you
have time to even start the network layer because if you did then you are faster than me.

Would you admit that it would take you years to turn this into a actual working product ready for testing ?

Nice tutorial and Go is much easier language than C++ too.

I perused all those videos too and what really disappoints me is that alot of those guides work on assumed knowledge.

They really arent novice friendly.

But it's like wanting to build a battle ship before you have even built a boat and takes a highly skilled team years to complete
and refine something that they can take it to market and today most of them fail so take it as mission impossible and people
should not be leading you on.

 

Creating your own blockchain is too difficult? For beginners it's easier to do that?

Thank You!

I have recently been going through a series of tutorials on naive chain (https://medium.com/@lhartikk/a-blockchain-in-200-lines-of-code-963cc1cc0e54) and naivecoin (https://lhartikk.github.io/). So far has been a very enjoyable read.

This is also a good idea. Build your own blockchain system. We need to save a lot of information and important data. How to build this system? You are not good at it if you buy the money is too large not necessary to spend money to install the blockchain system.

There is one available blockchain suite that can do all for you... privacy, explorer, coin mixer and atomic swap . Komodo is offering a white label blockchain development service.

It will take you a day or two of learning basics and another day or two to prepare node, compile wallet et.c. Depending on your prior knowledge it can take a week or two to pick up requirements. OP and first comment gives great links to start with.

The only question is why would you want it?

Is it really possible without a team? As far as I know it can be more than 12 month of development with a budget of at least 1 million, and its payback period will be at about half a year - yeat. Not less

Yes agree a team for a year to get something that will work in real life on the tinternet but i think some of the posters here are talking more about
knocking up a object that represents a block-chain and testing it via a function call.

Took me a month to come up with a data structure that is used for node discovery that would scale to maybe 1/4bn nodes and not much
more and I am still far from happy with the results but i could have dealt with 50,000 nodes using a XML-Data table is an afternoon

How much long does it take to make own blockchain?

It took me a week or two to make a production ready blockchain the first time I tried. However this was not from scratch, I used open source code like most do.

it's interesting to try to code something new, efficient, secure, and with
a new utility, and this is pretty more complicated than copy something existing.

I think building the blockchain system is very good. Just afraid we can not do that. This system is very useful for us. We can memorize and organize the work properly thanks to it. Blockchain is quite simple and easy to understand. It's a kind of database but distributed storage. It is difficult to edit a record after it has been added. Often used as a trading book.

I found nice tutorial in Udemy  - "Build a Blockchain and a Cryptocurrency from Scratch" it is 6.5 hours. Step by step tutorial how to write BC from scratch. Done that tutorial and like that a much. Why do you need own blockchain? Just use truffle, ganache,testrpc - it helps you a lot for the simulation real blockchain and understanding how it works. Today better to use other blockchains(side) then create your own.

This is whats wrong, distributed in this case is just replication of 220GB of data across 20,000 miners and it won't scale
ever and they knew this from day one and are now trying to bodge the job with off-block lightning network ledgers using banking hubs.

Large scaleable systems need some order (mining pools as an example) because every node for itself DOES NOT WORK

I think its cool that so many People are wana push the blockchain technology.

But i think also there is so much bulshit in this area so it will be better we make the existing system better
as try to program a new blockchain.

we can achieve much more wehn we look that the existing will be better.
Every body is just watching for fast money. But together we can make mor Money

for this you have to know about some computer languages such as python c# java c++ and also know about code reading skill due to this skill you can read different coin code which is on github

Of course not, you need to have atleast basic knowledge and info for creating such block chain, and planning is also important.

Like what type of Blockchain you want to implement?
You need people also to work under your block chain since you are merely needs to compete to other Blockchain server.
You need to market your block chain in order for it to expand to win over some perspective customers.

Don't take anything to be easy pal.

How long does it take to make own blockchain?? and beginner is also easy to do it?  ::)

I am happy and very impressed to see lots of interaction here on many different knowledge levels.

As a forum i believe this is what its all about, empowerment of self and of others through the exchange of knowledge.

I am flattered and like to thank the members who have messaged me seeking my help on a larger scale, however my experience is relatively low at this stage with working in a dev team.

That said, i am not able to assist, as i myself will likely be joining a team of developers launching an ICO. I hope to work on an internship basis offering my free time where i can, i am happy to surrender payment for experience and knowledge. I believe this opportunity of seeing an ICO from inception to final product will give me a huge range of knowledge in the future.

I will be back in the dev forum every so often with more hands on tutorials.

Knowledge is power...and we all have to start somewhere.

UA.

You have to work with a team of experts to survive such problems, and if you have projects related to coins and blockchains, do not try to do it yourself. These things are pretty tough. But in a half hour there are sites that produce your own coin.

A lot of those coin creator sites and the like, is there a chance that these can compile with some kind of malicious code if it's not subject to review?

Yeah, bravo!!! I'm learning to build my own blochchain too. Although not a coder but I believe I can do it.

If you want to work with blockchain but you don't want to build it from the beginning by yourself, DeepOnion is searching for developers to work with them. Anyway, if you don't want to join the team you can also join the community and learn about privacy coins  ;D You are welcome there

It will be a good motivator to the people who want to work on developing blockchain for improvements. And also to create own blockchain for proving services on smallscale. Very useful. Thanks for sharing.

Does it have all things well analysis?

Building a blockchain in the past was difficult, but now it's becoming easier for tech enthusiasts. I believe that this project will receive a lot of support from blockchain enthusiasts and ICO projects will also pay great attention to it.