CTE prefix is not used any more I think

https://elementsproject.org/features/confidential-transactions

That page refers to CTE being the prefix but I think it's VJ for Live Liquid and in elementsregtest it's Azp.

We should also note somewhere that that address format is only known to the sender and receiver and that it is a combination of the public address (what you see in blockstream.info for example) and the blinding keys the receiver uses.