Add Sapling support to z_getbalance and z_gettotalbalance
Also includes preparatory changes for various other RPCs that depend on `GetFilteredNotes` etc.
Closes#3214.
Revise help output for z_sendmany
The previous version of the usage message for z_sendmany used the word "Change"
in an ambiguous way.
The intent was to describe "Change" the noun that indicates the portion of a
transaction's funds that are returned to the payer, however the context did not
provide an immediate cue to differentiate from the verb form meaning
"to alter". Indeed, in other help strings in the same file that meaning of the
word is correct, i.e. the verb form is used. Moreover a typo in the form of a
missing "a" later in the same sentence exacerbated the problem, by decreasing
readability precisely where context could reduce confusion.
When used, it is cast to an integer_coeff_t, which is currently a long.
On LP64 systems, this cast is lossless. Issues with LLP64 systems will
be addressed later.
This could in future be refactored to be generic over PaymentAddress and
NotePlaintext in the return type, but for now let's be explicit about which
returned notes are for Sprout vs Sapling, and handle them separately.
Co-authored-by: Sean Bowe <ewillbefull@gmail.com>
Track Sapling notes and nullifiers in the wallet (in-memory only, no persistence to disk)
Part of #3061. Add in-memory tracking of Sapling notes and nullifiers to the wallet.
By using the flags defined through ./configure instead, libzcash will react to
configuration and build system changes (such as PIC_FLAGS being empty for
Windows builds).
We need separate functions for checking Sprout and Sapling nullifiers,
because they are in separate domains and aren't guaranteed to be
collision-resistant (otherwise there is a possibility of a nullifier
collision, however remote, between Sprout and Sapling causing the spend
of one to prevent the spend of the other).
When diversified addresses are supported, iterating over
mapSaplingIncomingViewingKeys will be inefficient as the mapping will
be addresses->ivk (n:1).
Jack Grigg