No accounts, no cookies, no trackers. The explorer is a static page that reads the chain.
Ordinary web logs. This site is served through Cloudflare, which sees your IP address and request details and keeps aggregate, short-lived logs as any web host does. The node behind it keeps standard access logs for a short time to keep the service running.
Wallet accounts. If you create one, the site stores your username, a hash of a login value derived from your password in your browser (never the password itself), the address, and your wallet key encrypted in your browser with your password. The site cannot decrypt it, cannot spend from it, and cannot reset your password. An email address is optional; if you give one it is stored unverified and, for now, used for nothing.
Market offers. If you post an offer, your wallet address, the amount, the price and your note are public on the board. The payment contact you enter (an Apple Cash phone or email, or a $cashtag) is stored and shown only to a buyer who takes your offer (and to you). Trades and their status are kept as a record; completed-trade counts per address are public.
Notifications. If you turn them on, your browser’s push subscription (an opaque endpoint issued by Apple, Google or Mozilla) is stored against your account so the site can send short notices; nothing else about your device is kept. Turn them off on the wallet page to delete it.
The address lookup sends the address you type to the node so it can answer. It is not stored beyond the logs above.
What the blockchain records
A blockchain is a public, permanent ledger. Every transaction, address, amount and miner tag ever included in a block is visible to anyone, forever, and cannot be deleted by us or by you. Do not put anything on it you would not put on a billboard.
Your keys
The software generates and stores your private key on your own computer. It is never sent to this site or to anyone. Sending coins transmits only a signed transaction.
Contact
Questions about this policy can be raised as an issue on the project’s GitHub repository.