Artificial Intelligence, Blockchains, cryptography, Decentralized, Digital Currency, Uncategorized, Yogi Nelson

🔐 How Cryptography Powers the World of Cryptocurrencies

Welcome to the BlockchainAIForum where your technology questions are answered.

Cryptography is the secret ingredient that makes cryptocurrencies work. Without it, Bitcoin, Ethereum, Cardano, and every other blockchain would simply not be secure or trustworthy. In this article, we will explore how cryptography works in the world of cryptocurrencies, explained in simple terms.


🧩 What is Cryptography?

Cryptography is the science of securing information so that only intended recipients can read it. Think of it like writing a message in code. If you know the code, you can read it. If you don’t, it remains a secret. In the digital world, cryptography relies on mathematical formulas and algorithms that are nearly impossible to break without the right key.


🏦 Why Cryptography Matters for Crypto

You may wonder: Why do we need all this math? Cryptocurrencies are decentralized, meaning no single person or bank controls them. Instead, people all over the world maintain the blockchain—the public ledger that records every transaction. Cryptography ensures that:

  • ✅ Transactions can’t be faked.
  • ✅ Coins can’t be spent twice.
  • ✅ Users can keep their private keys safe.
  • ✅ Everyone agrees on the ledger’s state without trusting anyone else.

🔑 Public and Private Keys

At the heart of crypto lies the concept of public and private keys.

  • Public Key: Like your email address. You can share it with anyone so they can send you crypto.
  • Private Key: Like your password. Only you should know it. It lets you spend or move your crypto.

These keys are mathematically related but it is impossible to figure out the private key from the public key. When you want to send crypto, you “sign” the transaction with your private key. Others can verify your signature with your public key to confirm it is valid.


✉️ Digital Signatures

Digital signatures are crucial. They prove that:

  • ✅ You authorized the transaction.
  • ✅ The transaction hasn’t been changed.

A digital signature is created using your private key and the transaction data. Anyone can check it with your public key. This ensures no one can forge your signature or alter your transaction.


🛡️ Hash Functions

Another critical tool in cryptography is the hash function. A hash function takes any input (like a document or transaction) and turns it into a short, fixed-length string of numbers and letters.

  • ✅ The same input always gives the same hash.
  • ✅ Even tiny changes in input produce completely different hashes.
  • ✅ It is impossible to figure out the original input just by looking at the hash.

In blockchains, hashes are used to:

  • Create unique “fingerprints” of transactions and blocks.
  • Link blocks together securely in a chain.
  • Ensure no one can change past records without detection.

⛓️ Blockchain Integrity: Chaining Blocks with Hashes

The term blockchain comes from linking blocks using cryptographic hashes. Here’s how it works:

  1. Each block contains a list of transactions.
  2. The block also includes the hash of the previous block.
  3. This forms an unbreakable chain.

If anyone tries to change a single transaction in an old block, its hash changes. That breaks the chain, making tampering obvious to everyone.


🧪 Zero-Knowledge Proofs (Advanced)

Some modern blockchains also use zero-knowledge proofs. These allow someone to prove they know something (like a secret or password) without revealing it. For example:

  • ✅ You prove you own funds without revealing your private key.
  • ✅ You prove you have enough balance without showing your entire account.

Zero-knowledge proofs can improve privacy and security.


🏛️ Example: Cardano’s Use of Cryptography

Let’s look briefly at Cardano, a popular blockchain project. Cardano uses advanced cryptography to secure its blockchain:

  • ✅ It uses Ed25519 for digital signatures, known for being secure and fast.
  • ✅ It employs Ouroboros, a proof-of-stake protocol that relies on cryptographic randomness to select who adds new blocks.
  • ✅ It explores zero-knowledge proofs to improve privacy and scalability in the future.

Cardano is an example of how blockchains go beyond simple signatures and hashes, using cutting-edge cryptography to enhance security and efficiency.


🌍 Why It All Matters

Without cryptography, there would be no cryptocurrencies. Banks have vaults and guards to protect money. Cryptocurrencies have cryptography. It lets people all over the world:

  • ✅ Exchange value securely.
  • ✅ Trust a shared ledger without intermediaries.
  • ✅ Protect their digital assets from theft or fraud.

✅ Key Takeaways

  • Cryptography secures cryptocurrencies without needing banks or middlemen.
  • Public and private keys enable secure ownership and transactions.
  • Digital signatures prove authenticity.
  • Hash functions link blocks in a tamper-evident chain.
  • Advanced tools like zero-knowledge proofs add privacy and efficiency.

💡 Conclusion

Cryptography is the bedrock of cryptocurrencies. It ensures that people can use decentralized digital money safely, securely, and confidently. Understanding the basics helps you see why crypto is revolutionary—and why it will continue to evolve with even better cryptographic tools in the future.

Until next time,

Yogi Nelson

AI Agents, AI Tools, Artificial Intelligence, Banking, Blockchains, cryptography, Decentralized, Digital Currency, international aid, International Finance, Productivity, Science, Uncategorized, Yogi Nelson

The Advantages of Stablecoins for Sending Remittances and International Payments

🌍💸

By Yogi Nelson

Welcome to the BlockchainAIForum where your technology questions are answered. Today we answer the following question: What are the advantages of stablecoins to transmit remittances and international payments?

Sending money across borders has long been expensive, slow, and sometimes unreliable. Millions of families around the world rely on remittances—money sent home by people working abroad. Traditional methods often take days to arrive and cost a big chunk of the amount sent in fees.

Enter stablecoins: a type of cryptocurrency designed to hold a steady value, usually pegged to a traditional currency like the U.S. dollar. While “crypto” might sound complicated or risky, stablecoins have clear advantages for cross-border payments—especially for everyday people who just want to get money to loved ones quickly and cheaply. Below, let’s explore what makes stablecoins such a game-changer for international payments.

🕰️ 1️⃣ Faster Transfers

Traditional money transfers often rely on banks and money transfer operators. These institutions use old payment networks that involve multiple middlemen. It can take 2–5 business days for the money to arrive. I can speak from personal experience–too slow in today’s world.

With stablecoins:

  • Transfers are nearly instant or settle in minutes.
  • Blockchain networks operate 24/7, including weekends and holidays.

Example: Sending USDC (a popular U.S. dollar-pegged stablecoin) from the U.S. to someone in Panama can take under 10 minutes, compared to days via bank wires.

💰 2️⃣ Lower Fees

Sending money internationally is notoriously expensive. According to the World Bank, the average remittance fee is around 6% globally—and even higher in some regions. Banco Popular charged me $100 to send $5,000 to Panama. Way too expensive!

Stablecoins reduce fees because:

  • No need for multiple banks to process the payment.
  • No foreign exchange markup if both sender and receiver use the same stablecoin (e.g., USDC, USDT).

Example:

  • $100 sent via Western Union might cost $6–10 in fees.
  • $100 sent as a stablecoin can cost under $1 in network fees, depending on the blockchain used.

🌐 3️⃣ Global Accessibility

Many people in developing countries do not have bank accounts. But they often have smartphones. Stablecoins can be sent, received, and stored on mobile wallets, without the need for a traditional bank.

Key benefits:

  • Financial inclusion for the unbanked or underbanked.
  • Access to USD-equivalent value without needing a dollar bank account.

Example: A worker in the U.S. can send USDC to a family member in El Salvador who holds it in a smartphone wallet, without needing local bank infrastructure.

💵 4️⃣ Protection Against Local Currency Volatility

In some countries, local currencies lose value quickly due to inflation. Receiving money in local currency may mean losing purchasing power almost immediately.

Stablecoins help by:

  • Being pegged to stable currencies like USD.
  • Preserving value across borders and over time.

Example: A family in Argentina might prefer to receive USDC instead of pesos, protecting their remittance from inflation.

🔐 5️⃣ Transparency and Security

Stablecoin transactions are recorded on blockchains, which are public, auditable ledgers. This adds an extra layer of security and transparency.

Advantages:

  • Sender and receiver can track the transfer in real-time.
  • Less risk of funds being lost in transit.
  • Resistant to censorship and freezes compared to some traditional systems.

⚡️ How Does It Work in Practice?

Here’s a simplified step-by-step:

  1. Sender buys stablecoins on an exchange or app.
  2. Sender transfers stablecoins to the recipient’s wallet address.
  3. Recipient receives them instantly or in minutes.
  4. Recipient can hold them, spend them where accepted, or convert to local currency.

This simple flow cuts out middlemen and delays.

🌟 Conclusion: A Better Way to Send Money

Stablecoins are not just a trend. They offer real, practical benefits for millions who rely on international payments:

  • ✅ Faster delivery times.
  • ✅ Lower costs.
  • ✅ Greater accessibility.
  • ✅ Protection from inflation.
  • ✅ Transparent and secure transactions.

Of course, challenges remain, like educating users, ensuring good regulation, and making stablecoins easy to cash out locally. But as adoption grows, these hurdles are being addressed.

For many families, stablecoins are already changing the way money crosses borders, making remittances fairer and more efficient.

💬 My closing thought comes from Ethiopia where they say: “a fool is thirsty in the midst of water.” If you have thoughts or questions about stablecoins and remittances, drop them in the comments below!

Until Next time,

Yogi Nelson

Artificial Intelligence, Blockchains, cryptography, Decentralized, Patents, Science, Uncategorized, Yogi Nelson

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  • ​Recerca​ – fundraising tool for research. They do many things very well, including winning 2nd prize at the Hedera X Filecoin Grant Program. The shortcomings Recera suffers is insufficient decentralization by design. Moreover, the Recera project does not feature tax incentives and they failed to solve the headaches of needlessly lengthy, dull and monotonous funding applications. Council still acts as gatekeepers to donation.
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