From b6f4677fcb9cc3f0d0bb81f9a9f8ed9d3aa12721 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?St=C3=A9phane?= <sudoweezy@gmail.com>
Date: Fri, 8 Sep 2023 16:13:09 +0200
Subject: [PATCH] Create arc-0078.md

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+---
+arc: 78
+title: NFT's vault of Application NFTs
+description: Application subsidiaries of an NFT storing Application NFTs
+author: Stéphane BARROSO (@SudoWeezy)
+discussions-to: https://github.com/algorandfoundation/ARCs/issues/213
+status: Draft
+type: Standards Track
+category: Interface
+created: 2023-06-16
+---
+
+## Abstract
+This standard is inspired by <a href="https://eips.ethereum.org/EIPS/eip-6551">EIP-6551</a>
+The goal is to create a smart contract that will give its owner a way to bundle multiple Algo/Fungible Token/NFTs at once.
+
+
+## Specification
+The key words "**MUST**", "**MUST NOT**", "**REQUIRED**", "**SHALL**", "**SHALL NOT**", "**SHOULD**", "**SHOULD NOT**", "**RECOMMENDED**", "**MAY**", and "**OPTIONAL**" in this document are to be interpreted as described in <a href="https://www.ietf.org/rfc/rfc2119.txt">RFC-2119</a>.
+
+### Glossary
+In the document, we will use the following syntax:
+- Authority NFT -> [ARC-72](./arc-0072.md) NFT that detain & manage others ARC-72 NFTs
+- Vault -> Application ID holding ARC-72 NFTs of the Authority NFT
+
+### Events
+To allow wallet & dApps to identify the vault of the Authority NFT, an [ARC-28](./arc-0028.md) event MUST be emitted when creating the vault.
+```json
+{
+  "events": [
+      {
+      "name": "arc78_AccountCreated",
+      "desc": "Creation of a Vault",
+      "args": [
+        {
+          "type": "address",
+          "name": "account",
+          "desc": "The current owner of the authority NFT"
+        },
+        {
+          "type": "uint256",
+          "name": "tokenId",
+          "desc": "The ID of the authority NFT"
+        },
+        {
+          "type": "uint64",
+          "name": "appId",
+          "desc": "The Application ID of the authority NFT"
+        }
+      ]
+    }
+  ]
+}
+```
+
+An `arc78_AccountCreated` event MUST be emitted when a vault is created.
+
+
+### Interface
+```json
+{
+  "name": "ARC-78",
+  "desc": "Authority NFT's Vault Base Interface",
+  "methods": [
+    {
+      "name": "arc78_isOwner",
+      "desc": "Indicate if the caller detains the Authority NFT of this vault",
+      "readonly": true,
+      "returns": { "type": "bool", "desc": "True if the caller detains the Authority NFT of this vault, False otherwise" }
+    },
+    {
+      "name": "arc78_setOwner",
+      "desc": "If the caller detains the Authority NFT of this vault, this method MUST set him as Owner of the vault",
+      "readonly": true,
+      "returns": { "type": "bool", "desc": "True if the caller detains the Authority NFT of this vault, False otherwise" }
+    },
+    {
+      "name": "arc78_transferTo",
+      "desc": "Transfers ownership of an NFT/fungible Token",
+      "readonly": false,
+      "args": [
+        { "type": "address", "name": "to" },
+        { "type": "uint64", "name": "amount" },
+        {
+          "type": "uint256",
+          "name": "tokenId",
+          "desc": "The ID of the Smart Contract/Application NFT to transfer (0 if ASA)"
+        },
+        {
+          "type": "uint64",
+          "name": "appId",
+          "desc": "The Application ID of the Smart Contract/Application NFT to transfer (0 if ASA)"
+        }
+      ],
+      "returns": { "type": "void" }
+    }
+  ]
+}
+```
+
+The `arc78_isOwner` method MUST be called internally by every other method.
+The `arc78_setOwner` method MUST error when the caller is not the owner of authority NFT.
+The `arc78_transferAlgoTo` method MUST error when `arc78_isOwner` returns false.
+The `arc78_transferTo` method MUST error when `arc78_isOwner` returns false.
+
+## Rationale
+Application NFT are compatible with this standard.
+
+## Backwards Compatibility
+This standard is compatible ARC-72 NFT standard.
+
+## Security Considerations
+The method `isOwner` **MUST** be called internally by the logic of every other application method (except `arc78_setOwner`) to ensure that the caller detains the Authority NFT.
+
+## Copyright
+Copyright and related rights waived via <a href="https://creativecommons.org/publicdomain/zero/1.0/">CCO</a>.