How to See What Whales Are Buying

You can see what whales are buying, but only part of it. Every trade made directly on a blockchain - a swap on Uniswap, a token bought inside a Phantom or MetaMask wallet - is written into a public record that anyone can read, within seconds. Trades made on a company exchange like Coinbase are not: those happen on the firm's own private books. So whale watching means reading the public half of the market carefully, and making honest guesses about the rest.
Where does buying actually show up?
On a block explorer. Paste a wallet address into Etherscan for Ethereum, or Solscan for Solana, and you get every transaction that address has ever made, with a timestamp. A swap shows both sides of the trade: Tether went out, ETH came in. That is a purchase, in public, minutes after it happened. Dashboards such as Arkham and Nansen do the same job with name tags attached, so an address reads as "ETF custody wallet" instead of a string of letters.
What a big exchange withdrawal does and does not prove
Coins leaving an exchange into a private wallet is the signal people quote most, and it is the weakest one. It tells you someone moved coins out. It does not tell you they just bought them, at what price, or even that the wallet belongs to the buyer. It is like watching delivery trucks pull up behind a shop: you can see crates going in, but never the receipts, and some of those crates are only moving between warehouses.
How do you follow holdings over time?
One transaction is noise; the shape of a portfolio is the story. Free trackers like DeBank and Zerion put a wallet's whole balance sheet on one page, so you can check the same address once a week and see whether its pile of ETH is growing or shrinking. That slow picture tells you far more than any single alert.
Start with one address you can actually explain - a project treasury or an ETF custody wallet - and watch it for a month before you trust anything you read into it. Then see how to track whale movements and what crypto whales are.