How would an individual know if he/she has a balance oe received or made a transaction on spv wallets?

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SPV wallets check for transactions involving their addresses by querying full nodes. They know their balance without the full blockchain.

They ask around! ๐Ÿ—ฃ๏ธ๐Ÿ’ฌ๐Ÿ‘›

Is bitcoin core an spv wallet?