Change Details

T3582 Implement new ecash-lib for building txs in Cashtab

T3582 Implement ecash-lib for building txs in Cashtab. This diff uses ecash-lib instead of utxo-lib + ecash-coinselect to build raw txs with schnorr signatures (previously all Cashtab txs were ECDSA). Because `ecash-coinselect` is calibrated for ECDSA, it does not provide accurate fee estimation for Schnorr txs (hence, it also does not provide accurate estimation of the maximum amount of satoshis a wallet can send, or a useful utxo selection algorithm). The key feature of `ecash-coinselect` --- determining whether or not a tx needs a change output, and what the value of that output should be given the desired tx fee --- is handled by ecash-lib. Going forward, we may wish to add utxo selection algorithms to ecash-lib. For now, since Cashtab only uses a simple accumulative algorithm and this was all that `ecash-coinselect` provided -- simply deprecate ecash-coinselect. Since `ecash-lib` already does most of what `ecash-coinselect` used to do (but better and for schnorr), `ecash-coinselect` should go through a deprecation cycle. No point in adding new features to the lib. There is still more work to be done to fully implement `ecash-lib` in Cashtab. `ecash-lib` covers features where Cashtab is currently still using `utxo-lib` or `slp-mdm`. These will be deprecated in subseqent diffs (see T3582).

T3582 Implement new ecash-lib for building txs in Cashtabecash-lib for building txs in Cashtab. This diff uses ecash-lib instead of utxo-lib + ecash-coinselect to build raw txs with schnorr signatures (previously all Cashtab txs were ECDSA). Because `ecash-coinselect` is calibrated for ECDSA, it does not provide accurate fee estimation for Schnorr txs (hence, it also does not provide accurate estimation of the maximum amount of satoshis a wallet can send, or a useful utxo selection algorithm). The key feature of `ecash-coinselect` --- determining whether or not a tx needs a change output, and what the value of that output should be given the desired tx fee --- is handled by ecash-lib. Going forward, we may wish to add utxo selection algorithms to ecash-lib. For now, since Cashtab only uses a simple accumulative algorithm and this was all that `ecash-coinselect` provided -- simply deprecate ecash-coinselect. Since `ecash-lib` already does most of what `ecash-coinselect` used to do (but better and for schnorr), `ecash-coinselect` should go through a deprecation cycle. No point in adding new features to the lib. There is still more work to be done to fully implement `ecash-lib` in Cashtab. `ecash-lib` covers features where Cashtab is currently still using `utxo-lib` or `slp-mdm`. These will be deprecated in subseqent diffs (see T3582).