Hoang  Kim

Hoang Kim


BlockChain - Xương sống của Bitcoin là gì? Hiểu rõ trong 5 phút

Công nghệ BlockChain là gì? Giải thích rất dễ hiểu chỉ 5 phút


What is GEEK

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BlockChain - Xương sống của Bitcoin là gì? Hiểu rõ trong 5 phút
Hoang  Kim

Hoang Kim


BlockChain - Xương sống của Bitcoin là gì? Hiểu rõ trong 5 phút

Công nghệ BlockChain là gì? Giải thích rất dễ hiểu chỉ 5 phút


Giles  Goodwin

Giles Goodwin


Adding Messages On The Bitcoin Blockchain - A How-To Guide


Today Luca asks:

Can I write on a Bitcoin Blockchain? Can I drop down a message?

Yes, Luca of course you can! You can leave a message on a Bitcoin blockchain using a particular op code, called **OP_RETURN**.

Through this operation code, your UTXO became unspendable! You can use at most 80 bytes for your message (160 hexadecimal characters)!

This operation is known as “timestamping of write information” because the message will become part of a block with a timestamp as well.

In Action

Can I write on Bitcoin Blockchain? — Italian Language 🇮🇹

First of all, I get a SegWit address from my testnet node.

$ bitcoin-cli getnewaddress "" "bech32"

I need bitcoins! I need to use a faucet service such as: https://bitcoinfaucet.uo1.net/send.php

After that, I can check my mempool and find my TX ID.

$ bitcoin-cli getrawmempool | grep c5ce66d638f1b8ca702dfb8f7d1da7a6707d9c6497212dc66829c99f69b28b9a

the c5ce66d638f1b8ca702dfb8f7d1da7a6707d9c6497212dc66829c99f69b28b9a is the faucet’s transaction.

When can I use my UTXO?

I can use it after the mining process.

Please recover my UTXO with **listunspent** command.

$ bitcoin-cli listunspent 1 101 '["tb1qrggdlvezgd4uy9mntz50mpmwd6l4vk9rm4ft3d"]' | jq
"txid": "c5ce66d638f1b8ca702dfb8f7d1da7a6707d9c6497212dc66829c99f69b28b9a",
"vout": 1,
"address": "tb1qrggdlvezgd4uy9mntz50mpmwd6l4vk9rm4ft3d",
"label": "",
"scriptPubKey": "00141a10dfb322436bc2177358a8fd876e6ebf5658a3",
"amount": 0.00100000,
"confirmations": 6,
"spendable": true,
"solvable": true,
"desc": "wpkh([3a46ecca/0'/0'/4']020d12775323bbdaf0cb6e9a2b44ae7a591ef5872364e80e363a93d283c10b9e4f)#kxjva7dw",
"safe": true

Nice! I need to retrieve the private key, as we know it’s mandatory to sign my transaction.

$ bitcoin-cli dumpprivkey tb1qrggdlvezgd4uy9mntz50mpmwd6l4vk9rm4ft3d

Now, we are able to create an amazing message, for instance: corsocompleto.bitcoininaction.com.

Yep, we need to use hexadecimal!

$ printf "corsocompleto.bitcoininaction.com" | xxd -ps

I have the necessary to create the transaction!

Using _help_ I can retrieve a lot of information about this method. I want to use it on **createrawtransaction**.

$ bitcoin-cli help createrawtransaction

The receiver is the faucet’s address, I give back bitcoins :).

The address is:


Finally, I can build my transaction, in the data field I can put my hexadecimal message. Remember that it will create an operation code OP_RETURN as we discussed above.

#bitcoin #blockchain #what-is-bitcoin #blockchain-development #blockchain-use-cases #blockchain-developer #btc #bitcoin-spotlight

⚠️Alert China Bans Bitcoin!! (Top 5 Things To Watch In Crypto This Week)

In today’s video we will discuss the latest Bitcoin news coming out of China. Top Ethereum and altcoin stories. A new blockchain based social media platform, and more…

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The origin of the article: https://www.youtube.com/watch?v=LV7QZ2oMAaM
🔺 DISCLAIMER: The article is for information sharing. The content of this video is solely the opinions of the speaker who is not a licensed financial advisor or registered investment advisor. Not investment advice or legal advice.
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#bitcoin #blockchain #bans bitcoin #alert china bans bitcoin #⚠️alert china bans bitcoin!! (top 5 things to watch in crypto this week) #top 5 things to watch in crypto this week

5 Blockchain Applications That Have Transformed the World of Technology

The blockchain is the decentralized database of the blocks of information, which gets recorded in the chain format and linked in a secured crypto graphical manner. This technology ensures proper safety of the data due to its secure nature, and it totally changes how people carry out transactions. It also brings about a faster and secure process of validating information needed to establish reliability.

Though blockchain technology came into the market to carry out only digital transactions, it is now used in various industries like supply chain, finance, health care, and many more.

The blockchain technology has made its position in mobile app development as well. Blockchain applications are transparent and accountable. From getting easy access to medical records and buying insurance, you can see blockchain applications everywhere.

Here are some of the areas where you can see the use of blockchain applications and how they have changed various industries.

1. Ripple

Ripple is useful for increasing banking transactions. The implementation of blockchain technology in the financial sector is much more profound than any other sector. Ripple proves this. It is one of the greatest tools to record and complete financial transactions.

It develops a large network despite strict physical boundaries. As there is no such third-party involvement present, the cost of these transactions is lower than usual. At the same time, the network also remains transparent and quite secured.

It is normally seen that financial transactions that happen globally are

error-prone and take a lot of time. In addition to this, when the transaction

fees and exchange rates get added up, the total cost usually gets high.

However, Ripple offers real-time international transactions without spending too much money. It has the network of about 200+ institutions making the process affordable, secure, and fast for all sorts of international transactions.

2. Etherisc

This blockchain application helps in automating flight insurance. Insurance is another area where blockchain is gaining popularity. Through this application, insurers can make smart contracts rather than getting involved in the traditional contracts that are usually complex. Etherisc is the blockchain application that helps customers buy flight insurance. If the flight gets canceled or delayed, they do not have to wait for months to get the payment back. This application ensures an on-time payout.

#blockchain #blockchain-technology #blockchain-development #blockchain-use-cases #blockchain-a #blockchain-technologies #technology #decentralization

Devin Pinto


Blockchain Certification | Blockchain Training Course | Blockchain Council

In all the market sectors, Blockchain technology has contributed to the redesign. The improvements that were once impossible have been pushed forward. Blockchain is one of the leading innovations with the ability to influence the various sectors of the industry. It also has the ability to be one of the career-influencing innovations at the same time. We have seen an increasing inclination towards the certification of the Blockchain in recent years, and there are obvious reasons behind it. Blockchain has everything to offer, from good packages to its universal application and futuristic development. Let’s address the reasons why one should go for Blockchain certification.

5 advantages of certification by Blockchain:

1. Lucrative packages- Everyone who completes their education or upskills themselves wants to end up with a good bundle, not only is one assured of a good learning experience with Blockchain, but the packages are drool-worthy at the same time. A Blockchain developer’s average salary varies between $150,000 and $175,000 per annum. Comparatively, a software developer gets a $137,000 per year salary. For a Blockchain developer, the San Francisco Bay area provides the highest bundle, amounting to $162,288 per annum. There’s no point arguing that learning about Blockchain is a smart decision with such lucrative packages.

2. Growing industry- When you select any qualification course, it becomes important that you choose a growing segment or industry that promises potential in the future. You should anticipate all of these with Blockchain. The size of the blockchain market is expected to rise from USD 3.0 billion in 2020 to USD 39.7 billion by 2025. This will see an incredible 67.3 percent CAGR between 2020-2025. To help business processes, several businesses are outsourcing Blockchain technologies. This clearly demonstrates that there will be higher demand in the future for Blockchain developers and certified Blockchain professionals.

3. Universal application- One of the major reasons for the success of Blockchain is that it has a global application. It is not sector-specific. Blockchain usage cases are discovered by almost all market segments. In addition, other innovations such as AI, big data, data science and much more are also supported by Blockchain. It becomes easier to get into a suitable industry once you know about Blockchain.

**4. Work protection-**Surely you would like to invest in an ability that ensures job security. You had the same chance for Blockchain. Since this is the technology of the future, understanding that Blockchain can keep up with futuristic developments will help in a successful and safe job.

**5.**After a certain point of your professional life, you are expected to learn about new abilities that can help enhance your skills. Upskilling is paramount. Upskilling oneself has become the need for the hour, and choosing a path that holds a lot of potential for the future is the best way to do this. For all computer geeks and others who want to gain awareness of emerging technology, Blockchain is a good option.

Concluding thoughts- opting for Blockchain certification is a successful career move with all these advantages. You will be able to find yourself in a safe and secured work profile once you have all the knowledge and information. Link for Blockchain certification programme with the Blockchain Council.

#blockchain certificate #blockchain training #blockchain certification #blockchain developers #blockchain #blockchain council