Blockchain network
The specific chain a crypto transfer travels on, such as TRC-20 (Tron), BEP-20 (BNB Chain) or ERC-20 (Ethereum); sender and receiver must match.
Many tokens exist on several blockchains at once. USDT, for example, is issued on Tron, BNB Chain, Ethereum, TON, Solana and others. Each is a separate network with its own addresses, fees and confirmation times. Token standard names such as TRC-20, BEP-20 and ERC-20 tell you which network a token lives on.
The rule that matters most: the network you send on must be the network the receiving address expects. Exchanges ask you to choose a network when you withdraw, and picking the wrong one can mean the funds arrive where the recipient can't automatically see them, or can't reach them at all.
Networks also differ in cost and speed. Ethereum (ERC-20) is usually the most expensive to use, which is one reason minimum amounts are often higher there. Tron, BNB Chain and TON are popular for cheaper transfers.
At Sky Trade each deposit shows its own address for the coin and network you selected. If the wrong coin or network is used, there is no automatic credit: the case goes to manual review via support, and funds sent on a wrong network may be unrecoverable. See how to deposit, how withdrawals work and the entry on wallet addresses.
Your deposit page shows a USDT BEP-20 address. On the exchange you select BNB Smart Chain (BEP20) as the withdrawal network — not TRC-20 or ERC-20 — and paste that address.