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How do you decide which type of database to use?

There are hundreds or even thousands of databases available today, such as Oracle, MySQL, MariaDB, SQLite, PostgreSQL, Redis, ClickHouse, MongoDB, S3, Ceph, etc. How do you select the architecture for your system? My short summary is as follows: 🔹Relational database. Almost anything could be solved by them. 🔹In-memory store. Their speed and limited data size[...]

Principles & Best practices of REST API Design

This best-practices article intends for developers interested in creating RESTful Web services that provide high reliability and consistency across multiple service suites; following these guidelines; services are positioned for rapid, widespread, public adoption by internal and external clients. Here is the complete diagram to easily understand REST API’s principles, methods, and best practices. Now, Let’s[...]

What really happens when Bob transfers 1 𝐁𝐓𝐂 to Alice on blockchain?

The diagram below shows the detail. 🔸 Step 0 – Bob wants to transfer 1 BTC to Alice. He initiates the transfer in his wallet. 🔸 Steps 1 and 2 – A transaction A is created with Alice’s address. Bob then 𝐬𝐢𝐠𝐧𝐬 the transaction with his private key. 🔸 Step 3 – The signed transaction[...]

What drives 𝐬𝐭𝐨𝐜𝐤 𝐩𝐫𝐢𝐜𝐞𝐬 up and down?

The diagram below shows how 𝐝𝐞𝐦𝐚𝐧𝐝 𝐚𝐧𝐝 𝐬𝐮𝐩𝐩𝐥𝐲 make the prices go up or down, using Meta’s stock as an example. All the buy/sell orders are placed into a 𝐂𝐋𝐎𝐁 (Centralized Limited Order Book). Green ones are buy orders, and red ones are sell orders. At each price level, there are several orders queued up[...]

What are the 4 models of 𝐜𝐫𝐨𝐬𝐬-𝐛𝐨𝐫𝐝𝐞𝐫 𝐩𝐚𝐲𝐦𝐞𝐧𝐭𝐬?

The diagram below shows the 4 models. ▶️ 1. 𝐂𝐨𝐫𝐫𝐞𝐬𝐩𝐨𝐧𝐝𝐞𝐧𝐭 𝐛𝐚𝐧𝐤𝐢𝐧𝐠 𝐦𝐨𝐝𝐞𝐥 The correspondent bank holds deposits owned by other banks from other countries. This allows banks to access financial services in different jurisdictions. Under some international card schemes (Visa, Mastercard), participating banks typically rely on correspondent banking for settlement. ▶️ 2. 𝐈𝐧𝐭𝐞𝐫𝐥𝐢𝐧𝐤𝐢𝐧𝐠 𝐦𝐨𝐝𝐞𝐥[...]

Why are stocks settled so slowly (T+2)?

The diagram below shows the overall flow. There are 3 parts: 🔹 Trading 🔹 Clearing 🔹 Settlement ▶️ 𝐓𝐫𝐚𝐝𝐢𝐧𝐠 Steps 1.1 – 1.3: The stock buyer and seller place orders via brokers or custodian banks. Step 2: The brokers execute the orders in the exchange. ▶️ 𝐂𝐥𝐞𝐚𝐫𝐢𝐧𝐠 Step 3: The exchange sends execution reports to[...]

What is a 𝐬𝐭𝐚𝐛𝐥𝐞𝐜𝐨𝐢𝐧? How does it work?

Is it going to change the payment industry? 👇 The diagram below shows how fiat-backed stablecoin USDC is created and destroyed. 𝐅𝐢𝐚𝐭 → 𝐒𝐭𝐚𝐛𝐥𝐞𝐜𝐨𝐢𝐧 🔹 Step 0 – A ERC-20 smart contract is deployed on the blockchain, with stablecoin token detail. 🔹 Step 1 – Bob transfers $100 from his fiat wallet to the custodian[...]

𝐖𝐡𝐚𝐭 𝐢𝐬 𝐂𝐁𝐃𝐂 (Central Bank Digital Currency)?

Why is it called 𝐩𝐫𝐨𝐠𝐫𝐚𝐦𝐦𝐚𝐛𝐥𝐞 𝐦𝐨𝐧𝐞𝐲? The diagram below shows a typical retail 𝐭𝐰𝐨-𝐭𝐢𝐞𝐫 CBDC architecture. Tier 1 is the 𝐜𝐞𝐧𝐭𝐫𝐚𝐥 𝐛𝐚𝐧𝐤, which is in charge of 𝐢𝐬𝐬𝐮𝐢𝐧𝐠 CBDC. Unlike cash, the issuing doesn’t involve printing out money, rather it is just a digital currencies that exist in the central bank’s system. Tier 2 is[...]

Blockchain FREE Books for Download

Qu’est-ce que la crypto-monnaie ? Histoire et Philosophie

Depuis la mise en place de l’euro, nous autres Européens, avons pris l’habitude de partir en vacances à l’étranger sans prendre en compte les taux de change et autres spécificités monétaires locales. Et pourtant, ce n’est pas le cas de tout le monde : partout en dehors de l’Europe, le moindre passage de frontière entraîne...

Qu’est-ce que la DeFi ou finance décentralisée ?

Parmi les différents cas (potentiels) d’utilisation des technologies blockchain. Aujourd’hui nous nous concentrerons sur la DeFi, ou finance décentralisée en français, qui commence à devenir un écosystème très intéressant, large et complexe. Nous verrons ce qui se cache derrière le terme “Finance décentralisée“, les acteurs importants du secteur et les innovations à venir. Qu’est ce que la finance décentralisée... : acheter vos Crypto-currencies en peer to peer

Ces dernières années, les conditions d’utilisation des plateformes d’échange se sont considérablement restreintes et il est devenu de plus en plus difficile d’acheter des cryptomonnaies de manière simple et anonyme. En effet, ces plateformes qui gèrent des monnaies comme l’euro ou le dollar sont désormais soumises aux normes de lutte contre le blanchiment d’argent et du financement du terrorisme imposées...

Mastering Ethereum: Implement advanced blockchain applications using Ethereum-supported tools, services, and protocols

An expert guide to implementing fast, secure, and scalable decentralized applications that work with thousands of users in real time Key Features • Implement advanced features of the Ethereum network to build powerful decentralized applications • Build smart contracts on different domains using the programming techniques of Solidity and Vyper • Explore the architecture of...

Blockchain Development for Finance Projects [ePub]

Blockchain technology will play a disruptive role in the banking and finance sector in the future. Experts estimate that it will save up to 20 billion dollars annually. You will build full-fledged financial applications using blockchain. It will aid you in building more secure and transparent workflows and re-engineering your business processes. Key Features Implement...

La Révolution Blockchain

Pour beaucoup, la Blockchain est perçue comme une nouvelle technologie- une de plus  ! En réalité, son potentiel de rupture est énorme. Le bitcoin, monnaie virtuelle dont la gestion échappe aux banques centrales et son protocole associé, la Blockchain sont fondés sur une technologie disruptive des échanges sur un réseau «  indélibile  » et en...

Finance FREE Books for Download

10 reasons why Ethereum is on course to breach $10,000

It’s been quite a roller-coaster of a year for Ethereum. When 2021 began, ETH was valued at just over $720 on the charts. At the time of writing, however, ETH was trading just under the $4100-level. Thanks to the scale of its performance, many crypto-enthusiasts have presented their own predictions for Ethereum’s current rally. ‘ETH is well on its...

Le Bitcoin (BTC) et l’Ether (ETH) vont-ils poursuivre leur chute ?

Le Bitcoin (BTC) chute, mais le bas du range tient Cette nuit, un tweet d’Elon Musk a fait l’effet d’une bombe sur le marché des cryptomonnaies. En effet, le PDG de l’entreprise Tesla a annoncé mettre fin pour le moment à la possibilité d’acheter ses voitures électriques via la technologie Bitcoin. Tesla & Bitcoin Quelques minutes après cette annonce, le...

Stake Hodler Capitalism: Blockchain and DeFi (Decentralized Finance)

To many of us, understanding the blockchain ecosystem is one of the most significant barriers to entry for DeFi (Decentralized Finance). The terminologies are technical, and that created a mental barrier to many individual and institutional investors. Blockchain is a revolutionary technology that is highly promising to decentralization enthusiasts. Blockchain is a tamper-proof and immutable...

Superfluid Protocol Showcases Money Streaming Protocol

Superfluid – a protocol for programmable cashflows – has showcased its smart contract framework for money streaming. 1/X 📣 We are incredibly excited to unveil Superfluid Protocol just in time for @ETHGlobal! 🚀 Programmable Cashflows will allow you to move any assets on-chain in a stream, without the need for recurring transactions. More details here👇 Superfluid protocol is focused...

Soft Skills Books

HBR Emotional Intelligence Ultimate Boxed Set (14 Books) (HBR Emotional Intelligence Series)

Free Download Link   How to be human at work. HBR's Emotional Intelligence Series features...


HBR Emotional Intelligence Boxed Set (6 Books) (HBR Emotional Intelligence Series)

Free Download Link How to be human at work. HBR's Emotional Intelligence Series features smart...


HBR 20-Minute Manager Boxed Set (10 Books) (HBR 20-Minute Manager Series)

You’ll get up to speed fast on the most essential business skills with this set of concise...


HBR Guide to Thinking Strategically (HBR Guide Series)

Synopsis The essential guide for managers to learn how to think strategically, focus on the big...


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