Featured Application Activity Marker

The featured application activity marker is specified in CIP 47. A summary follows.

Featured application activity markers (FeaturedAppActivityMarker) can be created for a transaction that adds value but does not involve a CC Transfer (e.g., a stable coin transfer or the settlement of a trade). CIP 47 says:

Featured application providers are expected to create featured application activity markers only for transactions that correspond to a transfer of an asset, or an equivalent transaction, which was enabled by the application provider. The detailed fair usage policy and enforcement thereof is left up to the Tokenomics Committee of the Global Synchronizer Foundation (GSF).

Generally the guidance is to create a FeaturedAppActivityMarker for any economically important event, such as:

• Lock or unlock a Real World Asset (RWA).

• Transfer a RWA.

• Mint or burn tokens.

However, it should not be created for any intermediate steps or a propose step.

A FeaturedAppActivityMarker is immediately converted into an AppRewardCoupon by the automation run by the Super Validators. The AppRewardCoupon is created with the DSO as the signatory and the provider field as an observer. By default, the provider can mint CC in the minting step. The featured field is set to true to indicate eligibility to receive featured application rewards, based on a FeaturedAppRight contract.

There can be several FeaturedAppActivityMarkers per transaction tree which increases the total reward. However, this is only allowed for composed transactions (e.g. a settlement transaction) where trading venue and all the registries of the transferred assets would get featured app rewards. It is also possible for a single Canton transaction tree to include ValidatorRewardCoupon, an AppRewardCoupon and a FeaturedAppActivityMarker(s) if there are sub-transcations that create each separately.

A non-featured app cannot accrue a FeaturedAppActivityMarker.

Creating a Featured Application Activity Marker

There are two prerequisites for an application to create a FeaturedAppActivityMarker. The first is to become an approved featured application which was described in the Types of Activity Records section. The second is to update the application code:

1. Find the fully qualified package-id of the interface definition for the FeaturedAppRight interface which is 7804375fe5e4c6d5afe067bd314c42fe0b7d005a1300019c73154dd939da4dda:Splice.Api.FeaturedAppRightV1:FeaturedAppRight for Splice.Api.FeaturedAppRightV1. The command daml damlc inspect-dar can be used to find this.

2. Query the ledger using this ID to retrieve contracts from the Daml ledger that implement the FeaturedAppRight interface. The curl example below illustrates this approach.

curl "http://$lapiParticipant/v2/state/active-contracts" \
"$jwtToken" "application/json" \
   --data-raw '{
   "filter": {
   "filtersByParty": {
         "'$holderPartyId'": {
         "cumulative":
         [
            {
               "identifierFilter": {
               "InterfaceFilter": {
                  "value": {
                     "interfaceId": "'7804375fe5e4c6d5afe067bd314c42fe0b7d005a1300019c73154dd939da4dda:Splice.Api.FeaturedAppRightV1:FeaturedAppRight'",
                     "includeInterfaceView": true,
                     "includeCreatedEventBlob": false
                  }
               }
               }
            }
         ]}
   }
   },
   "verbose": false,
   "activeAtOffset":"'$latestOffset'"
}'

3. The application’s Daml code will have to depend on the splice-api-featured-app-v1.dar and take an argument of type ContractId FeaturedAppRight on the choice whose execution should be featured, which allows that choice’s body to call the FeaturedAppRight_CreateActivityMarker in the next step.

3. In the application’s Daml code, using the FeaturedAppRight interface, exercise the FeaturedAppRight_CreateActivityMarker choice. Set the templateId to the fully qualified interface ID above.

4. For testing examples, please review the example DamlScript test here.

Consider a single, simple transaction of a RWA which creates a single FeaturedAppActivityMarker activity record for one provider and the beneficiary is the provider:

1. A FeaturedAppActivityMarker contract is created in the business transaction. The provider is set to the featured application provider’s party. The beneficiary must be set (unlike an AppRewardCoupon) to the party that should be eligible to mint the CC for that activity. The provider field of the FeaturedAppActivityMarker is set by calling the interface choice FeaturedAppRight_CreateActivityMarker.

1. No ValidatorRewardCoupon is created.

It is possible to share the attribution of activity for the FeaturedAppActivityMarker. The FeaturedAppRight_CreateActivityMarker choice accepts a list of AppRewardBeneficiary contracts. Then a FeaturedAppActivityMarker is created for each beneficiary with the weight field set appropriately.

Comments