Is it possible to change an output of a partially signed transaction?

2

In step 5 of the procedure described in https://en.bitcoin.it/wiki/Smart_Property#Theory, the buyer creates a partially signed transaction. Will the seller be able to change an output prior to signing and broadcasting - and thus returning the token to an output he may redeem himself?

bitcoinbob

Posted 2015-04-01T15:09:16.960

Reputation: 21

Answers

2

In one word: no. Changing tx output after signing makes existing signature invalid.

( There are some special cases, like signature hash type SIGHASH_SINGLE or SIGHASH_NONE, but we assume that the buyer uses correct signing SIGHASH_ALL )

amaclin

Posted 2015-04-01T15:09:16.960

Reputation: 5 763

There's nothing more correct about SIGHASH_ALL than other signature types. – Matthieu – 2015-04-01T18:13:16.063

Asked: 2015-04-01T15:09:16.960

Viewed: 154 times

Active: 2015-04-01T16:54:34.923