142 guides by Heidi.
FundamentalsCBDCs vs Cryptocurrency: Central Control vs Financial Freedom
A CBDC is digital currency issued and controlled by a central bank; cryptocurrency runs on a decentralized network no single party controls. CBDCs record every transaction, can carry spending conditions and can be frozen directly, while Bitcoin's supply is fixed at 21 million and self-custodied coins cannot be seized. Over 130 countries are exploring CBDCs; the US is legislating against one.
Heidi ChakosDeFi
DeFiWhat Is a zk-Rollup? Scaling Without Trust
A zk-rollup is an Ethereum Layer 2 that executes transactions off-chain, batches thousands of them, and posts a cryptographic validity proof plus compressed data back to Ethereum, where a verifier contract checks it. Transactions are final once the proof is accepted, so withdrawals take minutes instead of the 7-day window on optimistic rollups, and fees fall to fractions of a cent.
Heidi ChakosFundamentals
FundamentalsWhat Are Zero-Knowledge Proofs? A Simple Explanation of ZK Proofs
A zero-knowledge proof is a cryptographic method that lets one party (the prover) convince another (the verifier) that a statement is true without revealing any of the underlying data. Every valid proof is complete, sound, and zero-knowledge, and blockchains use the non-interactive kind. zk-SNARKs (Zcash, Mina), zk-STARKs (Starknet), and Bulletproofs (Monero) trade off proof size, trusted setup, and quantum resistance.
Heidi ChakosBitcoin
BitcoinWhat Are Privacy Coins and Are They Legal?
Privacy coins are cryptocurrencies that use cryptography (stealth addresses, ring signatures, zk-SNARKs, CoinJoin) to hide who sent what to whom. Owning them in a private wallet is legal in most countries, including the US; restrictions target exchanges, not holders. Japan and South Korea banned exchange listings, India prohibited exchange dealings in 2026, and the EU's AMLR bars licensed providers from handling them from July 2027.
Heidi ChakosReviews & Safety
Reviews & SafetyWhat Is Pepe Coin? A Look at the Token Behind the Meme
Pepe Coin (PEPE) is an ERC-20 meme token deployed on Ethereum on April 17, 2023 by anonymous developers, using Matt Furie's Pepe the Frog without his involvement. It has a fixed supply of 420.69 trillion tokens, no transaction tax, a renounced contract and no real use case. It hit a $1 billion market cap in three weeks and peaked above $11 billion in December 2024.
Heidi ChakosReviews & Safety
Reviews & SafetyWhat Is Ape Protocol? The Complete Guide to ApeCoin and ApeChain
Ape Protocol is the ecosystem behind ApeCoin (APE) and ApeChain, a Layer 3 on Arbitrum with 0.25-second blocks, sub-cent fees and native yield on bridged assets. APE is a fixed-supply 1 billion ERC-20 token used for gas, governance and Otherside purchases. In 2025 holders voted 98% to replace the DAO with ApeCo; by early 2026 APE traded near $0.10, down 99.6% from its high.
Heidi ChakosDeFi
DeFiWhat Is SocialFi? The Future of Social Media on the Blockchain
SocialFi (social finance) combines social media with decentralised finance so users own their identity, content and social graph on-chain and earn directly from their audience through social tokens, NFTs and tipping. Farcaster, Lens Protocol and DeSo are the main platforms today. The infrastructure is real, but user numbers are small, wallets and gas fees remain friction, and Friend.tech showed how fast speculation-driven platforms collapse.
Heidi ChakosRegulation & Tax
Regulation & TaxA Complete Guide to Cryptocurrency Taxes
Most countries tax crypto as property, so selling for fiat, swapping one coin for another, or spending it triggers a capital gain or loss, while buying, holding and moving between your own wallets does not. Staking and mining rewards are taxed as income when received. Germany and Portugal exempt holdings kept over a year. Automatic reporting under CARF, DAC8 and Form 1099-DA starts in 2026.
17 min read/Heidi ChakosMining
MiningWhat Is a Crypto Mining Rig and How to Build One?
A crypto mining rig is a custom computer, usually 4 to 6 GPUs on an open-air frame, built to run mining software nonstop. Since Ethereum moved to proof-of-stake in 2022, GPU rigs mine coins like Ravencoin, Ergo, Flux and Ethereum Classic; Bitcoin needs ASICs. It only pays with electricity under about $0.10 per kWh: an RTX 4090 clears roughly $1 to $3 a day.
Heidi Chakos