Quote from: Michael_S on January 17, 2025, 01:09:18 PM

Any ideas? How can I broadcast a "scriptsig-not-pushonly" signed transaction? It seems to be valid, but servers seem to reject it...

Usually, nodes throws that error if the signature in the transaction is invalid.
And based from your tries, it's not limited to Electrum servers (which are Bitcoin nodes too), blockexplorers' nodes rejects it as well.

Quote from: Michael_S on January 17, 2025, 01:09:18 PM

It verifies correctly on "https://coinb.in/#verify" but I cannot broadcast it anywhere. I always get error messages like these:

The problem is, coinb.in doesn't verify the validity of the signature in that page.
It just checks if the raw transaction's structure is correct.
It'll mark it as "signed" if it detected the presence of scriptSig whether it's valid or not.

You can try this with a signed raw transaction edited with the wrong signature.

Why do you have to use 1.7x anyways?
old "electrum.dat" wallet files and its seed phrase are still supported by the latest version.