Transactin

• verison
• input
• output
• locktime

Input

Reference of bitcoins you received previsouly

• Previous transaction ID
• Previous transaction index

Proof that you can spend these

• ScriptSig
  (Key to open locked ScriptPubKey, which is output of Previous transaction )
  

Sequence

Output

Define where the bitcoins are going

• ScriptPubKey
• Amount of bitcoins being assigned