Let’s say I sent some BTC to Bob, so I created a transaction (forget about scriptPubKey) since let’s say I was able to prove it by executing scriptPubKey. so After I sent BTC to BOB, new transaction’s input looks like this:
in: [
{
"prev_out": {
"hash": txId,
"n": 0
},
scriptSig:"3045....e5f5"
}
],
Now, this scriptSig exists because when other nodes come and see this, they should be able to validate it. Now, all we have here is the signature , public key (mine), txId(output transaction that I used).
How can another Node which got this transaction validate it ?
You might say: he will see signature + public key of yours. so what will it do to validate it ? if you say that it will try to decrypt signature with public key, that’s not enough. Because what I could do is encrypt blablabla string my private key and I’d put that signature there.
So I guess, my question relates to: how Node will prove I proved that I had BTC with scriptSig + txId ?
