feat: accept credentials from SocialKYC on Spiritnet as well (#63)

## fixes KILTProtocol/ticket#3093

Modifies `listOfRequests.ts` in a way that makes the project compatible
with the both blockchains, Spiritnet and Peregrine. Now it could be
merged into `main` an have all deployments depending on the same branch.

Author: rompemoldes

backend/src/credentials/listOfRequests.ts

@@ -2,6 +2,13 @@ import * as Kilt from '@kiltprotocol/sdk-js'
 
 // Establish which cTypes our dApp accepts and which attesters we trust:
 
+/**
+ * Usually, attesters have different DIDs depending on the blockchain, i.e. production or testnet.
+ *
+ * On the other hand, a cType Hash is calculated from the cType structure.
+ * If exactly the same structure is used on the test and production chain, the cType Hash will be the same.
+ */
+
 /**
  * Email Credential Type attested from SocialKYC.io
  */
@@ -11,15 +18,23 @@ export const emailRequest: Kilt.IRequestCredentialContent = {
       cTypeHash:
         '0x3291bb126e33b4862d421bfaa1d2f272e6cdfc4f96658988fbcffea8914bd9ac',
       trustedAttesters: [
-        'did:kilt:4pehddkhEanexVTTzWAtrrfo2R7xPnePpuiJLC7shQU894aY'
+        /** SocialKYC on the KILT Peregrine (Test) Blockchain: */
+        'did:kilt:4pehddkhEanexVTTzWAtrrfo2R7xPnePpuiJLC7shQU894aY',
+        /** SocialKYC on the KILT Spiritnet (Production) Blockchain: */
+        'did:kilt:4pnfkRn5UurBJTW92d9TaVLR2CqJdY4z5HPjrEbpGyBykare'
       ],
       requiredProperties: ['Email']
     },
     {
+      // On the future, SocialKYC will use this cType instead.
+      // which includes "'additionalProperties': false,"
       cTypeHash:
         '0xae5bc64e500eb576b7b137288cec5d532094e103be46872f1ad54641e477d9fe',
       trustedAttesters: [
-        'did:kilt:4pehddkhEanexVTTzWAtrrfo2R7xPnePpuiJLC7shQU894aY'
+        /** SocialKYC on the KILT Peregrine (Test) Blockchain: */
+        'did:kilt:4pehddkhEanexVTTzWAtrrfo2R7xPnePpuiJLC7shQU894aY',
+        /** SocialKYC on the KILT Spiritnet (Production) Blockchain: */
+        'did:kilt:4pnfkRn5UurBJTW92d9TaVLR2CqJdY4z5HPjrEbpGyBykare'
       ],
       requiredProperties: ['Email']
     }