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Subject: Re: [bitcoin-dev] [BIP proposal] Private Payments
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Update: Bob doesn't have to watch all address types he's advertising. When =
notifying Bob, Alice will pick one address type out of the ones Bob is adve=
rtising and include it in the notification. That way even if Bob's wallet a=
ccepts many address types, he still doesn't have to watch all of them for e=
ach Alice.
The previous spec reads:
> Alice then constructs a 72-byte OP_RETURN output whose value is set to `B=
IPXXXX + notification + N_Alice` (`+` is concat) and sends it in a transact=
ion containing no other outputs (XXXX to be replaced once a BIP number is a=
ssigned).
We can extended the payload to 73 bytes and define it as: `BIPXXXX + notifi=
cation + N_Alice + address_type`, where `address_type` is a single byte con=
taining the desired address type index (1 out of 16, limited by Bob's payme=
nt code). If Alice ever wants to start sending to a different address type,=
she can simply re-notify Bob and Bob will switch to a new address type in =
the case of Alice.
Alfred
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