Spark Program | Dular

[Hanssen]

@duongja

So the “phone-to-pubkey registry” should be interpreted as a discovery/
identity layer, not as a claim that every pilot user already runs an
independent always-on Fiber node. It maps a verified phone number to the Fiber
identity/receiving endpoint Dular can route to. In the current prototype this
is Dular-managed; in the fuller Fiber-native version, that same registry can
point to a user-owned or hosted-user Fiber node pubkey.

Because internal transfers are not yet individual Fiber channel updates, user-
level watchtower hosting is not part of the current implementation. The Fiber
nodes used in the prototype are operator-managed testnet nodes. If we move to
fully Fiber-native per-user channels, the design would need either hosted
Fiber nodes/watchtowers for mobile/USSD users or user-controlled nodes for
advanced users.

For non-Dular Fiber users: the lower-level Fiber integration exists, but the
current user-facing product is focused on phone-number transfers inside Dular.
Sending to an external Fiber user would mean exposing a “pay Fiber invoice”
flow. Receiving from an external Fiber user would mean exposing a Dular-
generated Fiber invoice or receive endpoint. These are technically aligned
with the current Fiber RPC integration, but they are not yet polished as end-
user flows in the Milestone 1/2 app.

I can totally understand that it’s not the highest priority to have a per-user Fiber node in this stage. I would still like to confirm with you about what we can expect at the end of all milestones.

1. You mentioned that the Fiber node is operator-managed. Does that mean we should expect all users to share the same public key? If not, how Dular implement this?

2. You mentioned that sending/receiving from non-Dular Fiber users is not implemented yet, which totally makes sense. But can we expect to have this feature at the end of all milestones? Because if not, the relationship between Dular and Fiber will be greatly weakened due to the fact that assets can’t flow freely inside Fiber.