A transfer between crypto platforms asks for both an address and a network. Choosing the wrong network is one of the few errors in the system that is genuinely irreversible.
Tokens exist separately on each chain
A widely used token often has versions issued on several different blockchains. They share a name and a price reference but are separate assets on separate ledgers.
Each chain maintains its own record of balances. A transaction on one chain has no effect on the others and is not visible to them.
Moving between chains requires a bridge or an exchange that holds assets on both sides, not a direct transfer, because no path exists between the ledgers themselves.
Address formats overlap between chains
Several networks use the same address format, which means an address valid on one is often syntactically valid on another.
Software therefore cannot reject the address as malformed. The transaction is constructed correctly, broadcast to the chosen network and confirmed there.
From the network's perspective nothing went wrong. The funds arrived at exactly the address specified, on the chain that was selected.
Recovery depends entirely on who controls the keys
If the destination is a wallet whose owner controls the private keys, those same keys often control the address on the other chain, and the funds can be reached.
If the destination is an exchange address, recovery depends on whether that exchange supports the chain the funds landed on and whether it offers a recovery process.
Where the exchange does not support that chain, the keys controlling the address may not be usable there, and the funds are unreachable regardless of intent.
Deposit addresses add another failure mode
Exchanges issue per-customer deposit addresses and credit accounts by matching incoming transactions to them. That matching runs per supported network.
An asset arriving on an unsupported network, or a token type the address was not issued for, may never be matched to any account even though it is on the ledger.
Some platforms operate manual recovery for these cases, often with a fee and no guarantee, and some state plainly that no recovery is available.
Why the confirmation offers no protection
In conventional payments a confirmation implies an intermediary accepted the instruction and can reverse it if something was wrong.
A blockchain confirmation means only that the transaction was included in a block. There is no counterparty holding the funds and no process for undoing it.
That is why platforms warn about network selection more insistently than about anything else in the transfer flow, and why small test transfers remain common practice.