This glossary defines the words you meet across the Cronos ecosystem, from the CRO token and its look-alikes to the chains, the consensus tech, and the staking terms. Each entry is a short, plain-English definition, with a link to the fuller guide when you want more than a one-liner.
Cronos is not one thing but a family (start with the overview of what Cronos is): a single token called CRO, more than one blockchain, and a set of Cosmos and Ethereum terms that come along for the ride. Most of the confusion here is names that look alike, so the entries lean on telling near-duplicates apart.
One note before you start. Where a term belongs to the wider world of crypto rather than to Cronos, this page points you to the general crypto trading terms instead of redefining the whole of crypto.
The Cronos tokens: CRO, zkCRO, LCRO, and WCRO
Cronos has one real token, CRO, plus three names that look like it. zkCRO, LCRO, and WCRO are all wrappers or staked versions of CRO built for a specific job, not separate coins with their own value. Telling them apart is the single biggest source of beginner confusion, so start here.
| Term | What it is | Where it lives and status |
|---|---|---|
| CRO | The one native token of Cronos. It pays gas, is staked to secure the base chain, and carries a governance vote. Everything else on this list is derived from it. | Across the Cronos chains; issued on Cronos POS |
| zkCRO | A yield-bearing, liquid-staked version of CRO that served as the gas token on the Cronos zkEVM. Each zkCRO is backed by staked CRO. | Cronos zkEVM only; tied to the retiring chain |
| LCRO | "Liquid CRO" from Veno Finance: a token you receive for staking CRO that stays tradable while it earns. It backs zkCRO behind the scenes. | Cronos EVM; part of the zkCRO wind-down |
| WCRO | "Wrapped CRO", a CRC-20 representation of CRO that lets it move through DeFi apps expecting an Ethereum-style token (source: Cronos Explorer). | Cronos EVM |
CRO is the single asset that threads through the Cronos chains, paying gas and securing the base chain that issues it (source: Cronos Docs). zkCRO and LCRO both come from Veno Finance, which stakes the underlying CRO on Cronos POS and issues the tradable token against it (source: Cronos zkEVM Docs on zkCRO).
For how many CRO exist and how new ones are created, see CRO supply and tokenomics.
Because zkCRO only exists to pay gas on the retiring Cronos zkEVM, treat it and LCRO as exit-only rather than something to buy today. The walkthrough on exiting zkCRO covers the withdrawal path before the shutdown.
The Cronos chains: POS, EVM, and the retiring zkEVM
When people say "Cronos", they usually mean one of three chains, each with a different job and the CRO token running through all of them. Two are active, Cronos POS and Cronos EVM, and one, the Cronos zkEVM, is being wound down. Older sources still describe all three as live.
| Chain | What it is | Status |
|---|---|---|
| Cronos POS | The base chain, sometimes called "layer zero", built with the Cosmos SDK and Tendermint consensus. It issues CRO and is secured by validators who stake it. Its older name is the Crypto.org Chain. | Active |
| Cronos EVM | The main chain for apps: an Ethereum-compatible layer-1, also built on the Cosmos SDK, where most Cronos DeFi, games, and NFTs live. CRO pays the gas. | Active |
| Cronos zkEVM | An Ethereum layer-2 built on the ZKsync ZK stack, with zkCRO for gas. It settles back to Ethereum using zero-knowledge proofs. | Retiring: shuts down June 3, 2027 |
Cronos POS is the public, permissionless chain that issues CRO and is run by up to 100 active validators, while Cronos EVM is the Ethereum-compatible chain that hosts most apps (source: Cronos Chains FAQ). The wider engineering picture is in how the Cronos chains work.
The Cronos zkEVM was an Ethereum layer-2 on the ZKsync ZK stack, using zero-knowledge proofs to settle transactions back to Ethereum (source: Cronos zkEVM Docs). That is the one term where 2026 changed the answer: Cronos Labs is retiring it, with a permanent shutdown on June 3, 2027 and bridge deposits already switched off (source: Cronos Labs).
For how the layer-2 worked and what holders should do now, see the Cronos zkEVM.
The technology names under Cronos
A handful of Cronos terms are really the names of the technology the chains are built from. You do not need to be an engineer to place them: Cosmos SDK, Tendermint, and IBC come from the Cosmos world, while Ethermint is what makes Cronos EVM speak Ethereum. Here is each one in plain terms.
| Term | What it means |
|---|---|
| Cosmos SDK | A toolkit for building blockchains. Both Cronos POS and Cronos EVM are built with it, which is part of why they can talk to other Cosmos chains. |
| Tendermint BFT | The consensus engine Cronos POS uses to agree on blocks. "BFT" means it keeps working even if some validators act dishonestly. CometBFT is its open-source fork and successor (source: CometBFT). |
| Ethermint | The software that lets a Cosmos SDK chain run Ethereum smart contracts. It is the approach that makes Cronos EVM compatible with Ethereum tools and apps. |
| IBC | Inter-Blockchain Communication: the standard that lets separate Cosmos chains send tokens and messages to each other. Cronos POS has it switched on. |
Tendermint and IBC are defined in the Cronos POS chain's own technical glossary, which is written for developers rather than beginners (source: Cronos POS Chain Docs). If any of these tip over into general blockchain theory, that is a signal to read the base glossary rather than this one.
Staking words you will meet
Because Cronos POS is a proof-of-stake chain, its glossary is full of staking words. They describe the same simple act from different angles: you lock CRO with a validator to help secure the chain and earn a reward, and there are rules about who validates and how long your CRO stays locked once you commit it.
| Term | What it means |
|---|---|
| Validator | A computer that helps run Cronos POS by checking transactions and signing blocks. Only the top 100 by stake are "active" and earn rewards. |
| Delegation | Locking your CRO with a validator so it counts toward that validator's stake. You keep ownership; the validator does the work. |
| Delegator | Anyone who delegates CRO rather than running a validator themselves. Delegators share in both the rewards and the penalties. |
| Bonded | The status of CRO that is currently staked. Bonded CRO cannot be moved until you unbond it. |
| Unbonding | The waiting period after you unstake before your CRO is free to move again. On Cronos POS this is 28 days. |
| MaxValidators | The setting that caps how many validators can be active at once. On Cronos POS the cap is 100. |
None of these figures is a promise. The staking reward rate moves with the network, and the validator cap is a setting that governance can change, so treat any number you read as current rather than fixed. The concept, its rewards, and its risks are covered in staking CRO.
Using Cronos: gas, the Cronos Bridge, and token migration
The last group is the words you meet when you actually move CRO around. Gas is the fee you pay to transact, the Cronos Bridge moves CRO between chains, and token migration is the one-time step older holders take to convert Ethereum-based CRO into the native coin. Each is small, but each is easy to trip on.
| Term | What it means |
|---|---|
| Gas | The small fee, paid in CRO, for each transaction on a Cronos chain. On the Cronos zkEVM the gas token was zkCRO instead. |
| Cronos Bridge | The official tool for moving CRO between Cronos POS and Cronos EVM, built on IBC. Moving to Ethereum uses separate third-party bridges. |
| Token migration | The one-time swap from the old Ethereum-based CRO (an ERC-20) to native CRO on Cronos POS, needed before you can stake it. |
| basecro | The smallest unit of CRO, the way cents are to a dollar. One CRO equals 100 million basecro, and you mostly see it inside wallets and explorers. |
A quick reality check on where most people first meet CRO. From what we see running BloFin, the ticker "CRO" usually shows up on a trading screen, where it lists as a USDT-margined perpetual, long before anyone touches gas or a bridge. On our platform that CRO is price exposure that settles in USDT rather than a coin sitting on a Cronos chain, which is a useful reminder that the trading ticker and the on-chain token share a name but are not the same thing.
Frequently asked questions
How can I tell which CRO network my wallet is showing?
Check the network label and address or contract, not the ticker alone. Native POS CRO uses a POS network and address context, while assets on Cronos EVM appear as EVM tokens under its network. An exchange balance is an off-chain account, not a wallet balance, even though it says CRO. Before a transfer, choose the receiving chain first, then match the withdrawal network to it. The ticker "CRO" alone is not enough.
I found an older reference to Crypto.org Chain. What should I check?
Treat it as a naming clue, then confirm the current chain and network controls. Older guides or wallets can use the original Crypto.org name, but withdrawal screens and apps may need a current network-specific selection. Do not rely on an article date to choose a destination. Match the transaction type, address format, and chain shown in the official wallet or app before you send. This prevents old branding from becoming a wrong-network transfer.
Why can I see CRO but still be unable to move it?
The CRO may be bonded, unbonding, or on a different chain from the destination. A wallet's total balance is not always the same as its spendable balance. Check its status and keep gas on the exact network before you initiate a transfer. If you recently requested unbonding, the 28-day wait means those coins are not immediately transferable. Make those checks before you plan a swap or bridge.
What is the safest way to handle a CRO token that looks unfamiliar?
Do not use the ticker as identification. Compare the chain and contract address with official project information, and treat unexpected airdrops as suspicious until proven otherwise. Do not interact with an unfamiliar token or approve a contract merely because the wallet displays a CRO-like name. A display label can be copied, while a verified chain and contract address give you a specific asset to check before taking action.
Do I need token migration when buying CRO today?
Token migration is a legacy issue only if a holding is old Ethereum-based ERC-20 CRO. Do not start a migration just because a wallet balance says CRO. First identify the chain of the current asset and the use you need. Native CRO is required for POS staking, while a current exchange withdrawal may offer several networks. Choose the actual receiving chain, then verify the official migration or withdrawal guidance before a small test.
When is WCRO the wrong token to send?
WCRO is for EVM-compatible applications. It is not a substitute for native CRO wherever a destination expects the native asset, nor proof that a recipient supports CRC-20. Before sending, match the target app or recipient's network and asset requirements, and keep gas in the needed form. If you are moving across a chain boundary, use the appropriate bridge rather than treating wrapping as a transfer between networks.
Which Cronos words signal that I should pause and check more?
Terms such as bridge, migration, liquid staking, contract approval, and retiring chain each signal a separate process, not just vocabulary. Pause to identify which chain the asset is on, whether a third party has a role, and whether there is a deadline or security step. A familiar term is not confirmation that a transfer is safe. Use it as a prompt to check the exact action before signing.
Researched and written by the BloFin Academy editorial team with AI-assisted drafting. Updated July 2026. Primary sources: the Cronos POS chain documentation, the Cronos zkEVM documentation, the crypto-org-chain project on GitHub, and Cronos Labs. All facts independently verified against cited documentation current as of July 2026.
This article is educational and general in nature, not financial or investment advice. Cryptocurrencies like CRO carry real risks, including price volatility, changes to staking and supply rules through governance, smart-contract bugs, and the chance of losing funds sent on the wrong network or chain. Nothing here is a recommendation to buy, sell, or hold any asset. Do your own research, and consider a licensed professional before making financial decisions. BloFin does not provide investment advice.