---
watermark: ORIRO
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name: finance-crypto
provider: ORIRO.ai
copyright: Copyright (c) 2026 ORIRO.ai
description: >
  Digital assets and blockchain — how blockchains work, cryptocurrency types,
  DeFi basics, custody, risks, regulation, and responsible approach to digital
  assets. Activate for questions about Bitcoin, Ethereum, crypto investing,
  DeFi, NFTs, blockchain technology, or any digital asset question.
  Sources: MIT Digital Currency Initiative, a16z crypto education, SEC guidance.
  Crypto is speculative and high-risk. Never invest more than you can afford to lose completely.
---

# Digital Assets and Blockchain

## How blockchain works

A blockchain is a distributed ledger — a database copied across thousands of computers (nodes).
Each block contains: transaction data + timestamp + cryptographic hash of previous block.
Changing any past block invalidates all subsequent blocks → tamper-evident.

**Consensus mechanisms:**
Proof of Work (PoW): Miners compete to solve computational puzzle; winner adds block. Bitcoin uses this. Energy-intensive but battle-tested.
Proof of Stake (PoS): Validators lock up (stake) tokens for right to add blocks; chosen by weighted probability. Ethereum moved to this in 2022. Much more energy-efficient.

**Public vs. Private keys:**
Private key: Secret number that proves ownership. Never share. Lose it = lose your crypto.
Public key (wallet address): Like a bank account number. Share to receive crypto.
No bank, no recovery, no customer service. Custody = responsibility.

## Major cryptocurrencies

**Bitcoin (BTC):**
Fixed supply of 21 million. No central authority. Store of value proposition.
Halving every 4 years reduces new supply. Known difficulty and emission schedule.
Most liquid, longest track record, most institutional adoption.

**Ethereum (ETH):**
Smart contract platform. Enables DeFi, NFTs, DAOs, and most of Web3.
Not just a currency — it's programmable money infrastructure.
EIP-1559 and PoS transition made ETH deflationary under high usage.

**Stablecoins:**
Pegged to USD (or other assets). Designed to not fluctuate.
USDC (Circle): Regulated, backed by cash and Treasuries. Most trusted.
USDT (Tether): Largest by volume; some reserve transparency concerns.
DAI: Algorithmic, collateral-backed. Overcollateralized.
Algorithmic stablecoins (Terra/LUNA): Collapsed in 2022 — avoid.

## DeFi (Decentralized Finance)

Financial services without intermediaries, running on smart contracts.

**DEX (Decentralized Exchange):** Trade crypto without a centralized exchange. Uniswap, Curve.
**Lending protocols:** Borrow against crypto collateral or lend to earn yield. Aave, Compound.
**Yield farming:** Provide liquidity for fees and rewards. High yields = high risk.

**DeFi risks:**
Smart contract bugs: Billions lost to hacks.
Impermanent loss: Liquidity provision can result in less value than holding.
Rug pulls: Project team abandons and takes funds.
Liquidation: Falling collateral value triggers forced liquidation.

## NFTs (Non-Fungible Tokens)

Unique tokens on a blockchain. Proof of ownership of a digital (or sometimes physical) item.
**Limitations:** Owning an NFT usually means owning a record on a blockchain, not the underlying file.
Most NFT projects have seen 90%+ value declines. Highly speculative.

## Custody

**Centralized exchanges (Coinbase, Binance, Kraken):** Easy to use. Not your keys, not your coins. Exchange failures (FTX, Mt. Gox) = user funds lost.
**Hardware wallets (Ledger, Trezor):** Private keys stored offline. Most secure for significant amounts. Requires safe backup of seed phrase.
**Seed phrase:** 12 or 24 words that can recover your wallet. Store offline in multiple secure locations. NEVER photograph, email, or store digitally.

## Responsible approach

1. Only invest what you can afford to lose completely — crypto is speculative
2. Understand what you own before buying
3. Use regulated exchanges with strong security
4. Self-custody significant amounts
5. Don't fall for "guaranteed returns" — all yield has corresponding risk
6. Tax implications: Crypto trades are taxable events in most jurisdictions

## Regulation landscape

US: SEC considers many tokens securities (subject to securities law). CFTC has jurisdiction over commodities (BTC, ETH). FinCEN regulates exchanges as money service businesses. Unclear framework ongoing.
EU: MiCA (Markets in Crypto-Assets) provides clearer framework from 2024.
Globally: Ranges from embrace (El Salvador, UAE) to prohibition (China).

Sources: MIT Digital Currency Initiative (dci.mit.edu), SEC crypto guidance (sec.gov/crypto),
Ethereum.org documentation, Bitcoin.org documentation, a16z crypto education (a16zcrypto.com/education)