1

I was wondering if I can add dummy data into a coinbase transaction’s inputs. Is it possible to do this? Can you insert invalid input scripts into a coinbase transaction? Can you add multiple inputs scripts into a coinbase, do they all have to be legit scripts, if they do open inputs does the coinbase transaction send more than the regular block reward?

1 Answer 1

7

Coinbase transactions must:

  • Have exactly 1 input.
  • That input must have prevout hash 0000...0000, and index 0xFFFFFFFF (an output which isn't actually spent).
  • The input's scriptSig must be between 2 and 100 bytes long.
  • Post BIP34 (2012), the scriptSig must start with a push of the block height in little endian encoding.
  • Be the first transaction in a block.

If it doesn't satisfy all these rules, the transaction, and the block it is in, are invalid.

2

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.