nLocktime - What is it and how can I send a transaction?

nLocktime - What is it and how can I send a transaction?

Can someone please explain to me how nLocktime works? We are currently at block 506503 would it be possible to send Bob 1 BTC now but lock it up until block 600000? Also is there any way I could cheat Bob by double spending that Bitcoin in nLocktime?

Also how am I able to send a Bitcoin transaction using nLocktime?

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