Demo based on paying tx fee for other

[arnabghose997]

Workflow of authz and feegrant module

We will be looking at how an Identity Provider will perform the DID Creation Transaction on behalf of its User

Let's assume the following roles who have their wallets created on Hypersign Identity Network:

1. IdP (Identity Provider whose role will be of a Granter)
2. User (Grantee, on whose behalf the transaction will be performed)

Steps:

1. IdP provides the necessary authorization to User by using the authz module:

hid-noded tx authz grant <User> generic --from <IdP> --msg-type "/hypersignprotocol.hidnode.ssi.MsgCreateDID"

2. IdP then provides FeeAllowance to User, where it can specify the fee spend limit

hid-noded tx feegrant grant <IdP> <User> --spend-limit 1000uhid

3. Generate the transaction which states that the IdP will be creating the DID

hid-noded tx ssi create-did '{
"context": [
"https://www.w3.org/ns/did/v1",
"https://w3id.org/security/v1",
"https://schema.org"
],
"id": "did:hs:0f49341a-20ef-43d1-bc93-de30993e6c52",
"controller": ["did:hs:0f49341a-20ef-43d1-bc93-de30993e6c52"],
"alsoKnownAs": ["did:hs:1f49341a-de30993e6c52"],
"verificationMethod": [
{
"id": "did:hs:0f49341a-20ef-43d1-bc93-de30993e6c52#z8BXg2zjwBRTrjPs7uCnkFBKrL9bPD14HxEJMENxm3CJ4",
"type": "Ed25519VerificationKey2020",
"controller": "did:hs:0f49341a-20ef-43d1-bc93-de30993e6c52",
"publicKeyMultibase": "z8BXg2zjwBRTrjPs7uCnkFBKrL9bPD14HxEJMENxm3CJ4"
}
],
"service": [{
"id":"did:hs:0f49341a-20ef-43d1-bc93-de30993e6c52#vcs",
"type": "LinkedDomains",
"serviceEndpoint": "https://example.com/vc"
},
{
"id":"did:hs:0f49341a-20ef-43d1-bc93-de30993e6c51#file",
"type": "LinkedDomains",
"serviceEndpoint": "https://example.in/somefile"
}
],
"authentication": [
"did:hs:0f49341a-20ef-43d1-bc93-de30993e6c52#z8BXg2zjwBRTrjPs7uCnkFBKrL9bPD14HxEJMENxm3CJ4"
]
}' did:hs:0f49341a-20ef-43d1-bc93-de30993e6c52#z8BXg2zjwBRTrjPs7uCnkFBKrL9bPD14HxEJMENxm3CJ4 --ver-key <private-key> --generate-only > tx.json

4. Broadcast the DID transaction to the Blockchain. This will be performed by the User and IdP will act as the fee account

hid-noded tx authz exec tx.json --from <User> --fee-account <IdP>