Understanding cross‑chain compatibility and what you can do when funds go missing.

You buy your first serious amount of Ethereum. You copy the deposit address, compare the first and last few characters, and hit send. Five minutes go by. Then ten. An hour later, your exchange balance is still zero, even though your wallet shows the crypto as sent.
There is no chargeback in crypto. In banking, a wire to a bad account number often bounces back. On a blockchain, once a transaction is confirmed, it is final. If you send funds to the wrong place, or even just on the wrong network, they do not come back on their own. They sit there, out of reach, and in many cases they stay that way.
Each cryptocurrency lives on a specific network. Think of networks like different countries, each with its own postal system. A correct house number is not enough if you mail your package to the wrong country.
The tricky part is that some networks use the same address format. Ethereum, BNB Smart Chain (BSC), and Polygon all use addresses that start with "0x". Because the address format looks valid, your wallet will happily send the transaction.
Here is the problem. If you send a token using BSC to an exchange that only accepts that token on Ethereum, the exchange’s systems never see the deposit. The coins are sitting at that address on BSC. The exchange is only watching Ethereum.
Most of these mistakes involve Ethereum Virtual Machine (EVM) compatible chains.
Imagine you are moving ETH from your wallet to a centralized exchange. You see that sending on Ethereum mainnet will cost around $15 in gas, but a Layer 2 network or a chain like BSC is only about $0.50. To save money, you pick the cheaper option.
You send ETH to your exchange deposit address using that low-fee network. The exchange, however, only supports ETH deposits on Ethereum mainnet, not on the network you selected.
Whether your crypto can be recovered depends on where you sent it.
If you sent the funds to your own non-custodial wallet, such as MetaMask, Trust Wallet, or a hardware wallet, and you control the seed phrase, you usually have a good chance.
Try this:
Your seed phrase is what controls the address on all compatible networks. Once you connect the correct network and token details, the funds should show up and become usable.
If you sent the funds to a centralized exchange or a broker, you do not control the private keys. Your only option is their support team and their internal rules.
CoinJar provides a dedicated recovery service for issues like unsupported networks or tokens sent to a CoinJar-controlled address.
There is a standard recovery fee, usually around $100, that applies when the recovery is successful. The initial review of your case is free, and in most situations the full fee is only charged if the funds are actually recovered. This is different from some platforms that charge large, non-refundable fees upfront, even when there is little chance of success.
If you talk about your lost funds on X, Reddit, Telegram, or anywhere else, scammers will show up fast.
The Scam: Bots or fake “experts” send you direct messages. They claim to be “blockchain support”, “CoinJar support”, or professional recovery agents. They promise to reverse your transaction, hack a smart contract, or somehow force the funds back.
The Reality: Blockchain transactions are final once confirmed. No one can truly reverse them. Anyone who says they can is lying.
Watch for:
Avoiding the mistake is far easier, cheaper, and less stressful than fixing it later.
Use these habits every time you move money:
Blockchains are powerful and transparent, but they are not forgiving. Sending crypto on the wrong network is like sending a package to the right street address in the wrong city. If you control the wallet, you can usually fix the problem by adding the correct network and token details. If you sent it to a centralized platform, recovery depends on their willingness and ability to help, and often comes with a fee.
Take a few extra seconds before you hit send. Check the network, run a small test transaction, and use tools like whitelists. Those small steps can save you from a very expensive mistake.




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