Corn is an Ethereum Layer 2 that does something unusual: it uses a Bitcoin-backed token, BTCN, to pay for gas instead of ETH. If you want to use apps on the Corn network from your existing wallet, you will need to add it to MetaMask first — MetaMask does not ship with every network pre-installed.
This guide walks you through exactly what Corn is, the network details you need, and two ways to add it to MetaMask step by step. You will also learn how to verify you added the right network and how to avoid the fake “Corn RPC” pages that scammers use to target people setting up new chains.
id=”what-is-corn”>What Is Corn?
Corn is an Ethereum-compatible Layer 2 network built on Arbitrum Orbit technology. What makes it different from most L2s is its gas token: instead of ETH, transactions on Corn are paid for with BTCN, a wrapped token designed to be backed 1:1 by native Bitcoin through multiple custodians and bridging protocols.
The idea behind Corn is to give Bitcoin real utility inside DeFi. Every transaction on the network consumes BTCN, which puts Bitcoin — usually a buy-and-hold asset — at the center of network activity. The network also has a governance token, CORN, used for staking and governance participation, plus a staking incentive design it calls “popCORN” that rewards long-term holders.
Key facts about Corn, as of this guide’s writing:
- Network name: Corn (sometimes listed as “Corn Maizenet”)
- Chain ID: 21000000 (reported consistently across Chainlink’s token docs, infrastructure providers, and exchange listings)
- Currency symbol (gas): BTCN
- Block explorer: shown in public guides as cornscan.io
- Base technology: Arbitrum Orbit, EVM-compatible
One important caution: in mid-2026, developers in the bridging community reported that Corn’s operator-run public RPC endpoints had stopped responding, with some endpoints returning errors. That does not necessarily mean the chain itself is gone — but it does mean you should verify the network’s current status through Corn’s own official channels before adding it, and only ever use RPC details published by the Corn team or a trusted infrastructure provider you already know. If official endpoints are down, there is nothing urgent to add; wait until the team confirms current status.
Why Add Corn to MetaMask?
MetaMask is a general-purpose Ethereum wallet: it can connect to any EVM-compatible network once you register that network’s details. Corn is EVM-compatible, so MetaMask handles it fine — you just need to teach it which chain to talk to.
Adding Corn to MetaMask lets you:
- View your Corn balances without a separate wallet app.
- Send and receive BTCN and Corn-based tokens with the same interface you already use.
- Connect to DeFi apps on Corn — lending, liquidity, and DEX frontends that support the chain.
- Interact with the explorer by copying your address or transaction hashes.
It is worth being clear about what adding a network does not do. Adding Corn to MetaMask does not buy you anything, move funds automatically, or earn rewards by itself. It simply registers the network so your wallet can display and sign transactions on it. Anything involving gas, bridging, or staking happens afterward and is a separate step with its own risks.
If you have already added other custom networks before — for example following our guide on how to add Polygon to MetaMask — this process will feel familiar. The fields are the same; only the values differ.
How to Add Corn to MetaMask, Step by Step
There are two main ways to add a custom network: typing the details in yourself (manual add) or approving a pre-filled request from a trusted website (one-click add). Here is how they compare:
| Method | How it works | Pros | Cons |
|---|---|---|---|
| Manual add | You type the network name, RPC URL, chain ID, currency symbol, and explorer URL into MetaMask yourself. | Full control; nothing is approved from an outside site. | You must type everything correctly; typos can connect you to the wrong chain. |
| One-click add | A website sends MetaMask a network request; you review and click Approve. | Fast; no typing; details are pre-filled. | You must trust the site completely — a malicious site can send fake network details. |
For a network like Corn, where the public documentation situation is mixed, the manual method is the safer choice: it keeps you in control and forces you to compare each field against the official values. Below are the full steps for both.
Method 1: Add Corn manually (recommended)
- Open MetaMask and click the network dropdown at the top of the wallet (it usually shows your current network, such as Ethereum Mainnet).
- Click “Add network” at the bottom of the network list. This opens MetaMask’s network page in a new tab.
- Choose “Add a network manually.” You will see a form with five fields.
- Fill in the fields using the values below. Copy carefully — the chain ID in particular must be exact:
- Network name: Corn
- RPC URL: the official RPC published by the Corn team (as of this guide’s writing, public guides list endpoints such as mainnet.corn-rpc.com or an Ankr Corn endpoint — confirm whichever is currently live on Corn’s official channels before using it)
- Chain ID: 21000000
- Currency symbol: BTCN
- Block explorer URL: cornscan.io (as listed in public guides)
- Click Save. MetaMask will validate the chain ID against the RPC and add the network. You may be asked whether you want to switch to it.
Method 2: Add Corn via a one-click request
Some chain-listing websites and Corn ecosystem pages offer an “Add to MetaMask” button. Clicking it opens a MetaMask prompt asking you to approve adding the network with the site’s suggested details. This only takes seconds, and it is legitimate when the site is genuinely the project’s own page.
The risk is that scammers clone these pages. A fake “add Corn” page can submit any RPC URL it wants — including one run by the attacker, or chain parameters for a lookalike network. If you use this method, do it only from a website you navigated to yourself through the project’s official channels, never from a link in a DM, email, or search ad. And even then, check every field in the approval popup against the official values before clicking Approve.
For more on moving safely between networks once they are set up, see how to switch networks in MetaMask safely.
How to Verify You Added the Right Network
Adding the network is only half the job. Spend a minute confirming it is correct — a wrong chain ID or RPC is exactly the kind of quiet mistake that causes confusing errors later.
- Check the chain ID matches. Open MetaMask’s network settings for Corn and confirm the chain ID reads 21000000. Chain IDs are the one thing that cannot be faked in your wallet’s own settings — if it shows 21000000, you are at least pointing at the real Corn chain parameters.
- Confirm the gas symbol. Corn’s gas token is BTCN. If MetaMask shows ETH or anything else as the native currency, something is wrong — delete the network entry and re-add it.
- Open the explorer and search your address. Paste your wallet address into the Corn block explorer (listed as cornscan.io in public guides). If the explorer recognizes your address format and shows the chain’s recent blocks, your setup is consistent. If the explorer does not load at all, treat that as a signal to pause and check network status rather than pushing transactions through blind.
- Send nothing real first. Before moving any funds to your Corn address, switch to the Corn network and simply look: does the account balance area behave normally, does the network name display correctly, does the explorer link resolve? These small checks take seconds.
Common Mistakes to Avoid
Most problems people hit when adding Corn come from a handful of avoidable errors:
- Typing the chain ID wrong. 21000000 has a lot of zeros, and one missing or extra zero points you at a different chain or fails validation entirely. Copy it as a block rather than retyping it — and double-check the count.
- Confusing CORN with BTCN. Corn has two tokens: CORN (governance and staking) and BTCN (the gas token). In MetaMask’s network form, the currency symbol field must be BTCN — that is the token used to pay transaction fees. Entering CORN there is incorrect.
- Expecting Corn to appear automatically. MetaMask only pre-lists popular networks; everything else is manual. If you cannot find “Corn” in the built-in list, that is normal — it just means you need to add it yourself.
- Adding it from a random blog’s one-click button. Blog tutorials are fine to learn from, but the “Add to MetaMask” button on an unfamiliar page deserves skepticism. Prefer manual entry with officially sourced values.
- Assuming a quiet network means a broken wallet. If the RPC you entered is slow or unreachable — something that has been reported with Corn’s operator endpoints — your wallet may fail to load balances. That is an endpoint problem, not lost funds. Do not “fix” it by re-entering seed phrases anywhere; check network status through official channels instead.
- Never enter your seed phrase on any setup page. Adding a network never requires your secret recovery phrase. Any site or popup asking for it during network setup is a scam, full stop.
If you are adding several new chains this week, our guide to adding Soneium to MetaMask follows the same pattern and can serve as a second practice run.
FAQs
The Bottom Line
Adding Corn to MetaMask takes about two minutes: open the network menu, add the details manually with chain ID 21000000 and currency symbol BTCN, and verify everything matches Corn’s official values. The one extra step this network deserves is checking its current status first, since public reports suggest its RPC endpoints have had reliability problems.
Once added, treat it like any custom network — confirm the explorer loads, start with tiny amounts, and keep your network details sourced from the project’s own channels rather than random pages.
This guide is for education only — not financial advice.
