When I sent myself testnet coins from my phone to my computer, I added a transaction label. When I look at the transaction in bitcoind, I can see the label but when I look at the transaction in a block explorer, I don't see the label.
Are the only people who can see transaction labels the sender and the receiver?
Thank you.
The only person who sees it is you. That is to help you document your transactions and is not broadcast to the network.