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I'm seeing MemoSq4gqABAXKb96qnH8TysNcWxMyWCqXgDLGmfcHr referenced in solana cookbook and memo doc but also seeing another memo program Memo1UhkJRfHyvLMcVucJwxXeuD728EqVDDwQDxFMNo used by others e.g Magic Eden. What are their differences and which one is recommended?

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    I'm guessing one is v1 and the other v2?
    – Cactus
    Commented Aug 6, 2022 at 15:30

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Memo1UhkJRfHyvLMcVucJwxXeuD728EqVDDwQDxFMNo is for v1 of the memo program.

MemoSq4gqABAXKb96qnH8TysNcWxMyWCqXgDLGmfcHr is for the latest memo program.

You can see that in the source code for the memo program

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