Fix tests w/ sending outputs as subset of receiving #7
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Co-authored-by: RubenSomsen <rsomsen@gmail.com>
Co-authored-by: Vojtěch Strnad <43024885+vostrnad@users.noreply.github.com>
BIP173 defines a 90 char limit, but we need 115. Most implementations already remove this limit as lightning encodings are longer than 90 char and use bech32, but still should be mentioned for wallet implementors.
This better matches conventions used in other BIPS. It's also likely wallet software already has code for doing these operations if they support BIP32.
Remove version since upgrades to silent payments not require regenerating silent payment keys. If there is a future upgrade that would require regenerating keys, then it should have a new BIP number.
Instead of 32-byte x-only keys, use compressed public keys for the silent payments address. This is to avoid parity mismatches, especially in the case of adding labels to the spend public key, which will cause the sign of the y point to flip between even and odd. Without the extra byte, we would need the sender and receiver to constantly negate the public and private keys at each step, which adds complexity and computational expense.
If Alice's wallet supports receiving silent payments, they can use the silent payment protocol to create change outputs for themselves. Mention this explicitly in the specification for sending.
Include a modified copy of bech32m (removes the 90 char limit) and a copy of the python secp256k1 implementation from the Bitcoin Core test framework
In order to maintain parity, negate the private keys for taproot outputs before performing ECDH. This ensures the receiver will arrive at the same result without needing to check both the even and odd y points for taproot x-only public keys
Detail backwards compatible upgrades vs backwards incompatible upgrades
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I was having trouble running the tests, it failed at "Multiple outputs: multiple outputs, same recipient". After looking at the test logic and cygnet3 implementation, I noticed this slight difference between the python code and his rust. It seems to make sense to me and after that all tests pass.