What is a blockchain explorer?

A blockchain explorer is a public, read-only interface that lets anyone view data recorded on a blockchain — transactions, wallet balances, token holdings, and block information. No account, login, or special permissions are required. This transparency is one of the fundamental properties of public blockchains: every transaction is verifiable by anyone, independently.

For the TON blockchain, the primary explorer is Tonviewer.

What you can do with Tonviewer

Track transactions: look up a transaction ID (TXID) to see the exact amount sent, the sender and recipient wallet addresses, the confirmation timestamp, and the block it was included in.
Check wallet balances: enter any TON wallet address to see its current balance and full transaction history.
View NFTs and tokens: see which NFTs and fungible tokens are held by any wallet, along with their verification status (verified, unverified, or SCAM).
Explore blocks: view block height, the transactions included in each block, and validator activity.

How to look up a wallet or transaction

Go to tonviewer.com.
Paste a wallet address or a transaction ID (TXID) into the search bar.
Press Enter to view the details.

If you sent a transfer and the recipient says they haven't received it, Tonviewer is the authoritative source: look up the transaction ID from your Tonkeeper history to confirm whether it was confirmed on-chain and which address it was sent to.

For more on finding your transaction ID, see What is a TXID and how do I find it?