question: how to recognize a signaling scheme

[jellegerbrandy]

So: Ape Unit is developing a signaling schem feature in #427

It works like this:

• generic actions include, in their ipfs data, a key-value pair and a corresponding action (add, delete, remove)
• these key-value paris are then indexed in the subgraph

This means that on-chain, there is no such thing as a "signalingscheme contract": it is just a GenericScheme that is treated different in subgraph and alchemy

The question is this:

• how does the subgraph know which GenericScheme to treat as a signaling scheme (how does the subgraph know for which contracts it needs to look for key-value pairs in the ipfs data)?
• how will alchemy know if a GenericScheme scheme is to be treated as a signaling scheme?

Example solution (not sure if this is good but would work):

• a schemeregistrar proposal for adding a new scheme includes in the data on ipfs under "descriptionHash" an (optional) field "typeofScheme"
• when registering a GenericScheme on proposal execution, the subgraph will read typeofScheme. If typeofScheme === 'SignalingScheme, it will (a) index the signal scheme events as described above and (b) set the name of the scheme to SignalingScheme
• alchemy can read the scheme name and provide the correct interface

[jellegerbrandy]

Maybe even better/easier to implement: just set contractToCall to an agreed-upon valie (say 0x0000000001), and use that.