Hi Andreas,

> I'm trying to finish off bitcoinj's implementation for sending to 
taproot addresses. For this, I'd like to test against a wallet that can
receive to P2TR and spend back.

I did this transaction few days back which creates a P2TR output while answering a question on Bitcoin Stackexchange: https://blockstream.info/testnet/tx/2035ead4a9d0c8e2da1184924abc9034d26f2a7093371183ef12891623b235d1

Pieter Wuille and Anthony Towns already shared things that would be helpful. Still wanted to share the steps I did for above transaction:

https://bitcoin.stackexchange.com/a/108013/

TL;DR - 

1.Create a blank descriptor wallet with private keys disabled

2.Import TPUB descriptor in wallet

3.Create new bech32m address

4.Send some bitcoin from another wallet

The answer could be improved if test vectors are added in BIP 86 for TPRV for follow things suggested by Anthony Towns in last email.

-- 
Prayank

A3B1 E430 2298 178F