Key Terms You Can’t Avoid with Stablecoins: Coins, Chains, Addresses, Gas

Explains coins/tokens, chains, addresses, private keys, seed phrases, and gas in plain language.

Stablehunter · Published: 2025-12-14 · Updated: 2026-01-05

Preface

Many people aren’t “scared off” by stablecoins themselves—they’re scared off by a pile of intimidating words:

• Token, chain, L1, L2
• address, public key, private key, seed phrase
• gas, miner fee, network congestion…

In reality, these words point to very ordinary ideas—just wrapped in new packaging. This piece does one thing:

Explain the few core concepts most relevant to stablecoins in plain English, so the next time you see these terms, you won’t instinctively want to close the tab.

1. “Coins” vs. Tokens: where do all these “coins” come from?

In everyday talk, people call almost everything on-chain a “coin.” But in technical/product terms, you should distinguish at least two categories:

• a chain’s native coin
• tokens issued on top of a chain

1.1 Native coins: the chain’s own “fuel”

Examples:

• ETH on Ethereum
• BTC on the Bitcoin network
• BNB on BNB Chain

Common traits:

• They are the chain’s “built-in” asset.
• They are usually used to pay network fees (gas).
• Sometimes they also support security incentives and governance.

A useful analogy:

To drive on a highway, your toll and fuel are paid in that highway’s own “fuel.”

1.2 Tokens: “application-layer assets” living on a chain

Tokens are assets built on top of a chain, for example:

• USDT on Ethereum (ERC‑20 USDT)
• project tokens issued on Ethereum
• DAI on Ethereum

They typically:

• follow a token standard (e.g., ERC‑20)
• use smart contracts to track balances and transfers
• require the native coin (e.g., ETH) to pay gas for transfers

Stablecoins are usually tokens, not native coins.

One-line distinction:

Native coin = the highway’s own fuel vouchers. Token = store credit / vouchers issued by shops on that highway.

2. “Chains”: why does the same stablecoin have multiple versions?

A common first question:

Why are there USDT‑ERC20, USDT‑TRC20, USDT‑BEP20…? What do these suffixes mean?

Because: the same stablecoin brand can issue tokens on multiple chains.

2.1 A chain is a different “base highway system”

Common examples:

• Ethereum
• Tron
• BNB Chain (formerly BSC)
• various Layer 2s (Arbitrum, Optimism, etc.)

Each chain has its own:

• ledger design
• node network
• security model
• fee structure

Think of them as:

Highway systems in different countries/cities— all “roads,” but with very different tolls, speed, and safety.

2.2 One coin, many chains: the same brand has “branches” on multiple highways

Take USDT as an example:

• USDT on Ethereum (ERC‑20)
• USDT on Tron (TRC‑20)
• USDT on BNB Chain (BEP‑20) …

These USDTs:

• have similar names and the same peg target (in theory, $1)
• but they live on different chains, like the same company operating in different countries

This leads to a very important operational detail:

Before you transfer, confirm the chain. If you send ERC‑20 USDT to an address that only supports TRC‑20, it may be effectively “lost.”

3. Address, public key, private key, seed phrase: who actually controls the money?

This cluster of concepts is critical for security, but the core idea is not complicated.

3.1 Address: your “bank account number”

On-chain, every account has a long string, for example:

0xA31f...9c8F

That’s your address, similar to:

• a bank card/account number
• an Alipay/WeChat “receive money” QR code

If someone knows your address, they can send you stablecoins.

3.2 Public key & private key: the lock and the key

Behind every address is a pair: “public key + private key”:

• Public key: can be public; often used to derive the address
• Private key: must never be public; whoever has it can move your funds

A good analogy:

Address = street address / door number Public key = the lock’s structure Private key = the key

People can know where you live and what lock model you use, but the key must stay with you.

3.3 Seed phrase: a backup of the “master key”

Most wallets generate a list of 12 or 24 words—this is the seed phrase. It can:

• regenerate your private keys and addresses
• effectively act as a master key

Two hard rules:

- Never screenshot it, never store it in cloud drives, never send it via chat apps. - Write it on paper, store backups separately, and don’t keep it with your ID documents.

If someone gets your seed phrase, they can “restore” your wallet on any device— meaning all your stablecoins (and other assets) are exposed.

4. Gas / miner fees: why do transfers require a “toll”?

First-time users often wonder:

I only sent 100 USDT— why is my wallet asking me to hold some ETH/TRX for fees?

Because:

• stablecoins are tokens “living on” a chain
• every transfer executes contract logic on that chain
• computation consumes network resources, so validators need to be paid

Different ecosystems use different names:

• Ethereum calls it gas fee
• Bitcoin culture often says “miner fee”
• the essence is the same: “pay the people maintaining the network”

4.1 A simple intuition for how gas fees work

Gas is mainly driven by two factors:

• how complex the action is (simple transfer vs. contract interaction vs. batch ops)
• how congested the network is (competition for scarce block space)

Think of it like:

ride-hailing base fare (complexity) + surge pricing (congestion).

4.2 Fee differences across chains

This is why:

• sending on Ethereum mainnet can sometimes be expensive
• sending on other chains (e.g., Tron) can be much cheaper

In practice, you often see this pairing:

• Use stablecoins as the asset (for price stability)
• Choose a chain with acceptable fees (for controllable cost)

5. One overview table: connect all the concepts at once

Summary

This section may look like “technical details,” but you can treat it as traffic rules + a basic toolkit for the stablecoin world:

• Coins vs. tokens: stablecoins are tokens living on a chain
• Chains: there are many; costs and UX differ; one stablecoin often exists on multiple chains
• Address / public key / private key / seed phrase: determines who truly controls the money
• Gas / fees: every movement costs a little “toll”

Once you have a mental picture of these concepts, later topics like “how to choose a chain,” “how to choose a wallet,” and “how to reduce fees” will feel like navigating a map—instead of staring into fog.

Resources

• Ethereum.org: Accounts, Keys, Wallets
• MetaMask Help Center
• Tron documentation (TRC‑20 overview)
• BNB Chain documentation
• Etherscan block explorer

If this piece helped even a little, feel free to share it with friends—so more people can understand the underlying logic first, and only then decide whether they want to deal with stablecoins.

Research methodology & corrections