Welcome back to the rCryptoCurrency Academy.
In Lesson 1, we learned that Bitcoin is “digital cash” that removes the bank from the middle. In Lesson 2, we learned that money is a technology we use to track value, and Bitcoin could be the next evolution, fixing the infinite “money printing” of Fiat.
But this leaves a technical hole in the story.
If there is no bank… who keeps track of the money?
The answer is the engine that powers the entire industry. The Blockchain.
The Problem: The Trust GapIn the old world, you trusted the Bank to keep the “Master Ledger” (the record of all accounts) safe in their private books/ledger. You couldn’t see it. You just had to trust that they wouldn’t delete your money or freeze your account. Up until the 1960s, these books were physical. Currently, they are on the bank’s servers.
In addition, you had to trust that the money kept its value. Even though, historically, fiat money has always gone to zero.
Satoshi Nakamoto realized that to build a decentralized currency, we didn’t need a better bank. We needed to get rid of the secret book entirely.
And we needed to have control of the creation of this new form of money.
The Solution: The Public LedgerA ledger is basically a book.
Imagine a Book that anyone can read in the middle of the internet’s Town Square.
Anyone in town can walk up to this book and post a signed transaction.
“Bob pays Alice 5 coins. Signed Bob”
Everyone else can see it. Because everyone can see it, everyone knows exactly how much money everyone else has. You can’t lie and say “I have 100 coins” if the board clearly shows you only received 50.
In technical terms, this is a Distributed Public Ledger.
Distributed: Everyone has a copy. Public: Anyone can read it. Ledger: It’s just a list of transactions.This is only possible because we can verify digital signatures with reasonable security. This is due to a technical thing called “Public key/Private Key Cryptography”, a relatively recent mathematical advancements (from the 1970s) that computers and the internet allowed us to implement for this end. We can now verify that Bob signed the transaction without even the verifiers being able to fake Bob’s signature.
The bitcoin ledger looks eerily similar to old bank ledgers
Blocks and ChainsSo, why is it called a “Blockchain”?
Think of the entire history of Bitcoin transactions not as a random list, but as an organized ledger full of pages (blocks). The blocks are connected to each other, forming a chain of blocks.
The Transaction: You buy coffee. This data is written down. The Block (The Page): Eventually, the page gets full of transactions. A “Bookkeeper” (Miner) verifies that the transactions are valid, seals the page, and adds a timestamp. This sealed page is a Block. The miner usually receives a small amount of BTC for this “bookkeeping”. These are called “mined bitcoin”. They may also receive a transaction fee from users. The Chain (The Glue): This is the magic part. Before the Miner starts a new page, they take a mathematical “fingerprint” (hash) of the previous page and write it at the top of the new one. Like numbered pages.This links all pages together digitally.
If even a single transaction or block is different, the entire chain collapses. The network sees the broken chain, rejects it, and accepts the real chain that everyone else is holding.
This makes the history of money Immutable (unchangeable).
The First Page: The Genesis BlockEvery chain has to start somewhere. You can trace every single Bitcoin in existence back to when it was first “mined”, through the pages of history, all the way to Page 1.
We call this The Genesis Block (Block 0).
When Satoshi Nakamoto mined this first block on January 3rd, 2009, he didn’t just start a currency. He left a message inside the code of the first transaction: a digital timestamp to prove exactly when it began, and perhaps, why it began.
Included in the raw data of that first block was this text:
“The Times 03/Jan/2009 Chancellor on brink of second bailout for banks”
It was a direct reference to the front page of The Times newspaper in London that day. It served two purposes:
Proof of Timestamp: Proving Bitcoin wasn’t pre-mined in secret years prior. A Declaration: The headline was about the failure of the modern banking system (bailing out banks after the 2008 crisis with newly printed money). Bitcoin was the answer. SummaryA Blockchain is not magic. Even though we like to joke that it is. “Any sufficiently advanced technology is indistinguishable from magic”.
Blockchain is a Shared Notebook of history.
Instead of a bank hiding the ledger, everyone holds a copy. Blocks are the pages of history. Chains are the mathematical proof that the pages haven’t been torn out or rewritten. The 21 Million BitcoinOne final rule governs this public notebook, and it is perhaps the most important one. Unlike fiat currencies, which can be printed endlessly by central banks effectively diluting your savings, the Bitcoin software has a hard limit: there will only ever be 21 million bitcoins. This rule is absolute and is protected by the consensus of the entire network.
If a miner tries to create more coins than the schedule allows, the rest of the network will reject their page as “fake”. Only real bitcoins can go on the blockchain.
This makes Bitcoin the first strictly scarce digital object in history. Once the final fraction of a coin is mined (estimated around the year 2140), the supply stops increasing forever, and miners will only earn small transaction fees paid by users.
What came after the Bitcoin Revolution?Now that we know how Bitcoin works, it’s time to learn about how millions of other CryptoCurrencies and CryptoAssets came to be.
Bitcoin was the first successful case, but it wasn’t the only one. People quickly started to disagree with Satoshi’s visions, terms, and even the technology.
They lauched their own CryptoCurrency.
What differentiates Bitcoin from other newer Cryptos?
And finally, a young men’s idea to transform Bitcoin into a decentralized internet computer ends up creating the world’s second largest Crypto?
That’s the subject of Lesson 4. See you then.
rCryptoCurrency Academy:
Course 1: The History of CryptoAssets Lesson 1: What is CryptoCurrency after all? The Bitcoin Story Lesson 2: The Evolution of Money (Debt, Barter, Gold, Fiat, and Crypto) Lesson 3: How a Blockchain Works (The “Public Ledger” Explained) (You Are Here) Lesson 4: Other CryptoCurrencies (Next Lesson) Lesson 5: The World Computer, Ethereum, and other Smart-Contract Cryptos Lesson 6: Types of CryptoAssets Course 2: CryptoAsset Tools and Finance Lesson 7: Common Crypto Mistakes and How to Spot Scams Lesson 8: Educational How to Buy CryptoAssets. Centralized Exchanges (CEX) and Decentralized Exchanges (DEX) Lesson 9: Wallets & Keys (Hot vs. Cold Storage) Lesson 10: Transactions (Gas Fees, Mempools, and Block Explorers) Course 3: CryptoAssets and the Smart Economy Lesson 11: Introduction to DeFi (Decentralized Finance) Lesson 12: NFTs: Beyond the JPEGs (Digital Identity and Ownership) Lesson 13: Real World Assets (RWA) & Tokenization Lesson 14: The Banking System with Stablecoins & CBDCs Course 4: CryptoAssets and the Law Lesson 15: Smart Contracts and Legal Validity Lesson 16: Oracles & The Law Lesson 17: Digital Evidence & Chain of Custody (What happens when things go wrong?) Course 5: The Frontier Tech of CryptoAssets Lesson 18: Proof of Work vs. Proof of Stake (Miners vs. Validators) Lesson 19: Layer 2 Solutions (Scaling) Lesson 20: Algorithms trading and AI agents Lesson 21: The Metaverse Course 6: Crypto Institutions (Governance & Compliance) Lesson 22: Corporate Structures in Crypto Lesson 23: What are rCryptoCurrency Moons? Lesson 24: DAOs and The rCyptoCurrency Non-Profit Model Lesson 25: The Futuresubmitted by /u/CryptoTrade1000 [link] [comments]
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