Valdrin Tahiri's avatar

Valdrin Tahiri

Senior Content Editor

Cryptocurrency writer, editor and trader with more than seven years of experience in digital asset markets. He specializes in technical analysis with a focus on Elliott Wave theory, on-chain metrics, and fundamental research, helping readers understand how market structure, liquidity cycles, and stablecoin flows shape the broader crypto ecosystem.

After discovering cryptocurrencies in 2017 while completing his MSc in Financial Markets, he developed a strong interest in blockchain technology and market dynamics. He has published thousands of articles analyzing price action, market structure, and macro-driven movements in digital assets.

His work focuses on breaking down complex data into clear, actionable insights, particularly around how crypto markets, stablecoins, and real-world payment use cases continue to converge.

@KAST_Valdrin@valdrin-tahirivaldrin@kast.xyz

Articles by Valdrin Tahiri

  • Stablecoins

    EUR Stablecoins in 2026: How They Work, Risks, Yield & USD Comparison

    EUR-pegged stablecoins let you move euro value onchain without defaulting to dollars, but liquidity, regulation, and FX exposure still matter. This guide explains how they work, how they maintain their peg, where yield comes from, and how platforms like KAST handle euro conversions in 2026.

    11 min
    5
    Read
    Intermediate
  • Global Spending

    What is a Crypto to Bank Transfer & Why You Need It

    A crypto to bank transfer converts your crypto or stablecoins into fiat and delivers it through banking rails like domestic networks or SWIFT. Understanding the payout route helps you control fees, timelines, and the currency that lands in your account.

    6 min
    4
    Read
    Beginner
  • Solana

    What Is Pudgy Penguins and How to Get the Pengu Crypto Card?

    Pudgy Penguins started as a 2021 NFT collection but has grown into a global brand with retail toys, a loyal community, and the PENGU token. Now, with the Pengu Card powered by KAST, that identity extends into everyday spending, letting you use crypto or fiat at 150M+ merchants and ATMs worldwide.

    9 min
    15
    Read
    Beginner
  • Global Spending

    KAST vs EtherFi: Complete Crypto Card Comparison for 2026

    KAST and EtherFi both let you spend crypto through traditional payment networks, but their structure, rewards, and fee models differ significantly. This 2026 comparison breaks down their design to help you choose the card that fits your spending style.

    8 min
    17
    Read
    Beginner
  • USD to ARS exchange rate
    Global Spending

    USD to ARS Exchange Rate in Argentina: Why Multiple Rates Exist and How to Avoid Losing Value

    In Argentina, two people can spend the same $100 and pay very different amounts in pesos depending on which exchange rate applies. With official, blue, MEP, and card-based rates all operating at once, the conversion path matters as much as the purchase itself.

    13 min
    12
    Read
    Beginner
  • Using SMS as 2FA
    Security

    SIM Swapping: Why You Should Never Use SMS for 2FA

    SMS-based two-factor authentication feels secure, but your phone number is not a strong security factor. Learn why SMS 2FA is vulnerable and how switching to app-based authenticators or stronger methods on KAST significantly improves your security.

    6 min
    17
    Read
    Beginner
  • The Truth Behind Zero Fees
    Global Spending

    What Are “Zero Fees” in Crypto: Every KAST Fee Explained

    This guide breaks down how hidden crypto fees actually work, where spreads and markups quietly reduce your payout, and how KAST shows every fee upfront so you always know what you pay and what you receive.

    7 min
    20
    Read
    Beginner
  • USDC to Bank Transfer
    Global Spending

    What is a USDC-to-Bank Transfer & Why You Need It

    A USDC-to-bank transfer sounds simple, but it always involves two steps: converting stablecoins into fiat and delivering the funds through banking rails like SEPA or SWIFT. Once you understand that structure, the fees, timing, and payout options make much more sense.

    7 min
    15
    Read
    Beginner
  • Stablecoins

    USDC on Solana vs USDC on Ethereum (ERC-20): Key Differences Explained

    USDC exists on multiple networks, including Ethereum (ERC-20) and Solana. While it’s the same stablecoin, network choice affects fees, speed, and compatibility. Here’s what changes and how to choose the right USDC network for your transfer.

    7 min
    7
    Read
    Intermediate
  • Security

    Seed Phrases Explained: Why KAST Handles the Keys for You

    A seed phrase is the master backup to your crypto wallet, and losing it can mean losing access to your funds permanently. This guide explains how seed phrases work, the risks of self-custody, and why custodial models like KAST can make everyday crypto use simpler and safer.

    7 min
    40
    Read
    Beginner
  • KAST vs Wise
    Global Spending

    Wise vs KAST: USD to PHP Fees, Rates and Transfer Comparison

    If you earn in USD and cash out to pesos, fees can quietly take a bite. This breakdown compares KAST vs Wise for USD-to-PHP transfers, showing how each platform charges and how much PHP the recipient really receives.

    8 min
    26
    Read
    Beginner
  • Solana

    How Solana Cards Work: A Beginner's Guide

    What a Solana card actually does, how payments work, and the Solana card options KAST offers for spending crypto like a normal card.

    7 min
    25
    Read
    Beginner
  • What Is Impermanent Loss?
    DeFi

    Impermanent Loss 101: How DeFi Yields Really Work

    High APRs in DeFi liquidity pools look tempting, but they come with trade-offs that aren’t always obvious. This guide explains impermanent loss, why it happens, and how to think more clearly about yield.

    5.0
    11 min
    65
    Read
    Advanced
  • Global Spending

    KAST vs RedotPay: Which Crypto Card Is Better for Everyday Spending?

    A clear comparison of KAST vs RedotPay. See fees, cashback, limits, and real-world costs to choose the right crypto card for your spending.

    5.0
    9 min
    145
    Read
    Beginner
  • What is Staking and Lending?
    DeFi

    Staking vs. Lending: A Beginner’s Guide to Safer Yield

    Staking and lending can look similar in crypto, but they work for very different reasons. This guide breaks down how yield really works, what can fail, and how to choose the safer strategy for your situation.

    5.0
    8 min
    60
    Read
    Intermediate
  • Crypto Token Categories
    Crypto Basics

    What Types of Crypto Tokens Are There? A Guide to Token Categories

    Crypto tokens can represent many different things, from stable value to access, voting rights, or ownership. This guide breaks down the main types of crypto tokens and how to understand what each one is actually for.

    12 min
    60
    Read
    Intermediate
  • What is the best stablecoin for spending?
    Stablecoins

    USDC vs. USDT vs. USDe: A Beginner’s Guide to the Best Stablecoin For Spending

    A stablecoin can be great for trading and still be frustrating to spend. For everyday use, what matters most is stability under stress, fast and cheap transfers, wide support, and a clear risk profile. This guide compares USDC, USDT, and USDe through the lens of real-world spending.

    5.0
    8 min
    50
    Read
    Beginner
  • Cold Storage vs Cold Wallet
    Security

    Cold Storage vs. Card Wallet: How Much Should You Keep on KAST?

    Most crypto advice frames storage as a binary choice. A better approach is separating long-term holdings from a working balance. Cold storage keeps funds safe by staying out of reach, while a card wallet like KAST keeps money accessible for spending, transfers, and everyday life.

    5.0
    7 min
    17
    Read
    Beginner
  • A Guide to Crypto Off-Ramps
    Global Spending

    Mastering Crypto Off‑Ramps: A Complete Tutorial

    Off-ramping feels frustrating when it looks like a black box. Once you understand the rails behind it, the process becomes a set of clear choices.

    8 min
    59
    Read
    Beginner
  • Dollar Falls While Peso Rises
    Global Spending

    Peso Strong, Dollar Weak: What It Means for Your Money

    A strong peso and weak dollar do not affect everyone the same way. Learn how exchange rates, FX fees, and where you earn and spend actually shape your buying power in Mexico.

    5.0
    8 min
    39
    Read
    Beginner
  • How RWA Gives You Yield
    DeFi

    What Is RWA Backing? Tutorial on How Treasury Bills Secure Your Yield

    Real-World Assets (RWAs) bring familiar assets like U.S. Treasury bills and bonds onchain. RWAs let you earn yield backed by traditional financial instruments. This guide explains how RWA backing works, why it exists in crypto, and how KAST Earn uses it to help you generate steady yield.

    7 min
    38
    Read
    Intermediate
  • Why Some Crypto Transactions Fail
    Crypto Basics

    Gas Limits: A Beginner's Guide on Optimizing Your Transaction Fees

    Gas limits and gas prices decide whether a crypto transaction succeeds, fails, or gets stuck waiting. This guide breaks down what those numbers actually mean, how fees are calculated, and how to avoid paying for transactions that don’t go through.

    7 min
    43
    Read
    Intermediate
  • Why Your Card Balance Updates Late
    Crypto Basics

    Why Settlement Time Matters for Your Card Balance

    Ever notice your card balance update hours or days after you’ve already paid? That delay is settlement time. This guide explains how card transactions really work, why balances don’t change instantly, and how on-chain settlement with KAST helps your balance update faster and more transparently.

    9 min
    38
    Read
    Beginner
  • What's the difference between coins and tokens
    Crypto Basics

    What’s the Difference Between Coins and Tokens?

    Coins and tokens aren’t the same thing, and confusing them can cost you time, fees, or even funds. This guide breaks down the real difference between crypto coins and tokens, explains why stablecoins like USDC and USDT are tokens (not coins), and shows what KAST uses.

    5.0
    8 min
    30
    Read
    Beginner
  • Importance of identity verification
    Security

    What Is Identity Verification And Why Do Cards Ask for It?

    Identity verification is required before you can use a crypto card. This guide explains why KYC exists, what it checks, and how KAST verifies users to keep accounts secure and compliant.

    6 min
    64
    Read
    Beginner
  • The real risks behind stablecoins
    Stablecoins

    Can a Stablecoin Lose Its Value? Real Risks Explained

    Stablecoins are designed to hold a $1 value, but history shows they can lose their peg. This guide explains how stablecoins work, why depegs happen, which designs are riskier, and how KAST decides which stablecoins to support.

    5.0
    8 min
    64
    Read
    Advanced
  • How to read a block explorer
    Crypto Basics

    How to Read a Block Explorer: Tracking Your Card Top-Ups

    Ever sent crypto and wondered if it actually went through? This guide shows you how to use a block explorer to track your transaction in real time, understand confirmations, and see exactly when your KAST card top-up is ready to spend.

    10 min
    30
    Read
    Beginner
  • Why are Solana gas fees so cheap
    Solana

    What Are Gas Fees and Why Are They So Cheap on Solana?

    Gas fees are the cost of processing transactions on a blockchain. Some networks charge dollars or more per transaction, while others charge fractions of a cent. The difference comes down to how each blockchain is designed, and why Solana makes everyday crypto spending fast and cheap.

    10 min
    54
    Read
    Beginner
  • How stablecoins earn yield
    Stablecoins

    Where Does Stablecoin Yield Come From? The Real Sources Behind Your Returns

    Stablecoin yield comes from real onchain demand, borrowing, trading, and capital deployment, not inflation or promos. When demand rises, yields rise. When it falls, so does yield.

    5.0
    8 min
    132
    Read
    Intermediate
  • Blockchain confirmations explained
    Crypto Basics

    Blockchain Confirmations Guide: ‘Instant’ Payments Aren't Always Final

    Crypto payments feel instant, but finality takes time. Here’s what really happens after you hit send, why confirmations matter, and how KAST removes that friction from everyday spending.

    8 min
    73
    Read
    Beginner