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Just like https://www.blockchain.com/btc/tx/230636ab4f285ca5e9f4c32dbae581c10d491a99493d8733c594af780f1edc5e

what does it mean when a transaction contain multiple inputs? as i know, an transaction should be signed by the sender`s the private key. However there are a lot of sender in one transaction, how does it happen? thanks

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  • It is just like in the real world, you combine multiple bills and coins to pay for an item. Two bills of 1 USD to form a payment of 2 USD.
    – Penquin
    Sep 20, 2018 at 1:30
  • ...and in the real world, your ownership is proven by possession of each the bills. In bitcoin, this is proven by each of the signatures.
    – hedgedandlevered
    Sep 21, 2018 at 23:55

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A single transaction may contain multiple inputs and outputs. It is not the transaction that is signed by the sender, but each input. The signature is in the scriptSig field of each input.

See http://en.bitcoin.it/wiki/transaction

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