Why do I see two wallet addresses next to the signer for one single transaction on Solscan?

External question — Solana Stack Exchange Author: user52192 Original post: https://solana.stackexchange.com/questions/24277 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. I wanted to check somebody buying into a memecoin on Jupiter. Dexscreener redirects me to Solscan. Why do I see two wallet addresses next to the signer for one single transaction? Thank you.

External answer — Solana Stack Exchange Author: Hamid Burek Original post: https://solana.stackexchange.com/a/24303 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. A Solana tx can have multiple signers, it's not limited to one. Usually means one wallet is the fee payer and the other had to sign because the instruction needed its authority too. Common cases: Separate fee payer (one wallet pays fees, another authorizes the swap). Bots and aggregators do this a lot. The tx moves funds or changes authority on an account owned by the second wallet, so that wallet has to sign off. Multisig or a relayer setup. First signer in the list is the fee payer. The second one signed because some instruction in the tx required its signature, check the instructions tab and you'll see which one and why.