Updates for Mainnet Deployment

README.md

@@ -26,7 +26,7 @@ so they can build a basic understanding of the programming language.
 | ------------- | -------------------- |
 | Previewnet    | Coming Soon |
 | Testnet       | [`0x4516677f8083d680`](https://contractbrowser.com/A.4516677f8083d680.USDCFlow) |
-| Mainnet       | Coming Soon |
+| Mainnet       | [`0xf1ab99c82dee3526`]() |
 
 This is the contract that defines the Cadence version of Flow USDC. 
 Before the Sept 4th Crescendo migration, users can send

contracts/USDCFlow.cdc

@@ -113,12 +113,10 @@ pub contract USDCFlow: FungibleToken {
                     return FungibleTokenMetadataViews.FTDisplay(
                         name: "USDC (Flow)",
                         symbol: "USDCf",
-                        description: "This fungible token representation of USDC is bridged from Flow EVM.",
-                        externalURL: MetadataViews.ExternalURL("https://www.circle.com/en/usdc"),
+                        description: "This fungible token representation of Axelar USDC is bridged from Flow EVM.",
+                        externalURL: MetadataViews.ExternalURL("https://docs.axelar.dev/learn/axlusdc"),
                         logos: medias,
-                        socials: {
-                            "x": MetadataViews.ExternalURL("https://x.com/circle")
-                        }
+                        socials: {},
                     )
                 case Type<FungibleTokenMetadataViews.FTVaultData>():
                     return FungibleTokenMetadataViews.FTVaultData(
@@ -179,6 +177,26 @@ pub contract USDCFlow: FungibleToken {
         self.VaultPublicPath = /public/usdcFlowMetadata
         self.ReceiverPublicPath = /public/usdcFlowReceiver
 
+        // Create a new FiatToken Vault and put it in storage
+        self.account.save(
+            <-FiatToken.createEmptyVault(),
+            to: FiatToken.VaultStoragePath
+        )
+
+        // Create FiatToken Vault Capabilities
+        self.account.link<&FiatToken.Vault{FungibleToken.Receiver}>(
+            FiatToken.VaultReceiverPubPath,
+            target: FiatToken.VaultStoragePath
+        )
+        self.account.link<&FiatToken.Vault{FiatToken.ResourceId}>(
+            FiatToken.VaultUUIDPubPath,
+            target: FiatToken.VaultStoragePath
+        )
+        self.account.link<&FiatToken.Vault{FungibleToken.Balance}>(
+            FiatToken.VaultBalancePubPath,
+            target: FiatToken.VaultStoragePath
+        )
+
         // Create the Vault with the total supply of tokens and save it in storage.
         let vault <- create Vault(balance: self.totalSupply)
         self.account.save(<-vault, to: self.VaultStoragePath)

contracts/utility/FiatToken.cdc

@@ -9,6 +9,7 @@ pub contract FiatToken: FungibleToken {
     pub let VaultStoragePath: StoragePath
     pub let VaultBalancePubPath: PublicPath
     pub let VaultReceiverPubPath: PublicPath
+    pub let VaultUUIDPubPath: PublicPath
     pub let MinterStoragePath: StoragePath
 
     pub var totalSupply: UFix64
@@ -24,12 +25,20 @@ pub contract FiatToken: FungibleToken {
 
     /// ------- FiatToken Resources -------
 
-    pub resource Vault: FungibleToken.Provider,
+    pub resource interface ResourceId {
+        pub fun UUID(): UInt64
+    }
+
+    pub resource Vault: ResourceId, FungibleToken.Provider,
         FungibleToken.Receiver,
         FungibleToken.Balance {
 
         pub var balance: UFix64
 
+        pub fun UUID(): UInt64 {
+            return self.uuid
+        }
+
         /// getSupportedVaultTypes optionally returns a list of vault types that this receiver accepts
         pub fun getSupportedVaultTypes(): {Type: Bool} {
             let supportedTypes: {Type: Bool} = {}
@@ -78,6 +87,7 @@ pub contract FiatToken: FungibleToken {
         VaultStoragePath: StoragePath,
         VaultBalancePubPath: PublicPath,
         VaultReceiverPubPath: PublicPath,
+        VaultUUIDPubPath: PublicPath,
         MinterStoragePath: StoragePath,
         initTotalSupply: UFix64,
     ) {
@@ -87,6 +97,7 @@ pub contract FiatToken: FungibleToken {
         self.VaultStoragePath = VaultStoragePath
         self.VaultBalancePubPath = VaultBalancePubPath
         self.VaultReceiverPubPath = VaultReceiverPubPath
+        self.VaultUUIDPubPath = VaultUUIDPubPath
 
         self.MinterStoragePath = MinterStoragePath
 

flow.json

@@ -95,8 +95,9 @@
 		"USDCFlow": {
 			"source": "./contracts/USDCFlow.cdc",
 			"aliases": {
-				"testing": "0000000000000007",
-                "testnet": "4516677f8083d680"
+				"mainnet": "f1ab99c82dee3526",
+				"testing": "0000000000000008",
+				"testnet": "4516677f8083d680"
 			}
 		},
 		"USDCFlowMinterToBridge": {
@@ -118,6 +119,28 @@
 			"address": "f8d6e0586b0a20c7",
 			"key": "758abfd76ad82071cbeeb309f251eeefbe9bb8442557de745769a6ff0a912636"
 		},
+		"mainnet-test": {
+			"address": "93a83fa73bc253ce",
+			"key": {
+				"type": "file",
+				"location": "./mainnet-test.pkey"
+			}
+		},
+		"mainnet-usdc-josh": {
+			"address": "f1ab99c82dee3526",
+			"key": {
+				"type": "google-kms",
+				"hashAlgorithm": "SHA2_256",
+				"resourceID": "projects/dl-flow-admin/locations/global/keyRings/flow-usdc/cryptoKeys/flow-usdc-mainnet/cryptoKeyVersions/1"
+			}
+		},
+		"testnet-test": {
+			"address": "85639e2129d50be5",
+			"key": {
+				"type": "file",
+				"location": "testnet-test.pkey"
+			}
+		},
 		"testnet-usdc": {
 			"address": "4516677f8083d680",
 			"key": {

tests/transactions/create_fiattoken_vault.cdc

@@ -0,0 +1,42 @@
+
+import "FungibleToken"
+import "FiatToken"
+
+transaction() {
+
+    prepare(signer: AuthAccount) {
+
+        // Return early if the account already stores a FiatToken Vault
+        if signer.borrow<&FiatToken.Vault>(from: FiatToken.VaultStoragePath) != nil {
+            return
+        }
+
+        // Create a new ExampleToken Vault and put it in storage
+        signer.save(
+            <-FiatToken.createEmptyVault(),
+            to: FiatToken.VaultStoragePath
+        )
+
+        // Create a public capability to the Vault that only exposes
+        // the deposit function through the Receiver interface
+        signer.link<&FiatToken.Vault{FungibleToken.Receiver}>(
+            FiatToken.VaultReceiverPubPath,
+            target: FiatToken.VaultStoragePath
+        )
+
+        // Create a public capability to the Vault that only exposes
+        // the UUID() function through the VaultUUID interface
+        signer.link<&FiatToken.Vault{FiatToken.ResourceId}>(
+            FiatToken.VaultUUIDPubPath,
+            target: FiatToken.VaultStoragePath
+        )
+
+        // Create a public capability to the Vault that only exposes
+        // the balance field through the Balance interface
+        signer.link<&FiatToken.Vault{FungibleToken.Balance}>(
+            FiatToken.VaultBalancePubPath,
+            target: FiatToken.VaultStoragePath
+        )
+
+    }
+}

tests/wrapped_fiattoken_test.cdc

@@ -7,11 +7,13 @@ import "USDCFlow"
 import "FiatToken"
 
 access(all) let admin = Test.getAccount(0x0000000000000007)
+access(all) let usdcFlowContractAccount = Test.getAccount(0x0000000000000008)
 access(all) let recipient = Test.createAccount()
 
 access(all) let VaultStoragePath = StoragePath(identifier: "USDCVault")!
 access(all) let VaultBalancePubPath = PublicPath(identifier: "USDCVaultBalance")!
 access(all) let VaultReceiverPubPath = PublicPath(identifier: "USDCVaultReceiver")!
+access(all) let VaultUUIDPubPath = PublicPath(identifier: "USDCVaultUUID")!
 access(all) let MinterStoragePath = StoragePath(identifier: "USDCMinter")!
 access(all) let initTotalSupply = 1000.0
 
@@ -42,6 +44,7 @@ fun setup() {
             VaultStoragePath,
             VaultBalancePubPath,
             VaultReceiverPubPath,
+            VaultUUIDPubPath,
             MinterStoragePath,
             initTotalSupply
         ]
@@ -101,6 +104,8 @@ fun testWrapTokens() {
         []
     )
     Test.expect(scriptResult, Test.beSucceeded())
+    var totalSupply = scriptResult.returnValue! as! UFix64
+    Test.assertEqual(250.0, totalSupply)
 
     // FiatToken supply should not have decreased
     scriptResult = _executeScript(
@@ -109,17 +114,26 @@ fun testWrapTokens() {
     )
     Test.expect(scriptResult, Test.beSucceeded())
 
-    let totalSupply = scriptResult.returnValue! as! UFix64
+    totalSupply = scriptResult.returnValue! as! UFix64
     Test.assertEqual(1000.0, totalSupply)
 
-    // Verify the senders old FiatToken balance
+    // Verify the senders old FiatToken balance was decreased by the amount wrapped
     scriptResult = _executeScript(
         "scripts/get_fiattoken_balance.cdc",
         [admin.address]
     )
     Test.expect(scriptResult, Test.beSucceeded())
     var balance = scriptResult.returnValue! as! UFix64
-    Test.assertEqual(1000.0, balance)
+    Test.assertEqual(750.0, balance)
+
+    // Verify the USDCFlow old FiatToken balance was increased by the amount minted
+    scriptResult = _executeScript(
+        "scripts/get_fiattoken_balance.cdc",
+        [usdcFlowContractAccount.address]
+    )
+    Test.expect(scriptResult, Test.beSucceeded())
+    balance = scriptResult.returnValue! as! UFix64
+    Test.assertEqual(250.0, balance)
 }
 
 access(all)