Hedera NFT Asset Definition

CAIPs/caip-78.md

@@ -0,0 +1,74 @@
+---
+caip: 78
+title: Asset Reference for the Hedera nft namespace
+author: Danno Ferrin (@shemnon)
+discussions-to: https://github.com/hashgraph/hedera-improvement-proposal/discussions/169
+status: Draft
+type: Standard
+created: 2021-11-01
+updated: 2021-11-01
+requires: 19, 75
+---
+
+## Simple Summary
+
+This document is about the details of the Hedera Token Service 'nft' asset
+namespace and reference for CAIP-19.
+
+## Abstract
+
+In CAIP-19 a general asset identification scheme is defined. This is the
+implementation of CAIP-19 for `nft` in the
+[Hedera Token Service](https://docs.hedera.com/guides/docs/integrating-a-hedera-token-service-token#hedera-token-service)
+representing non-fungible tokens.
+
+## Motivation
+
+See CAIP-19.
+
+## Specification
+
+### Token Asset Namespace
+
+The asset namespace is called `nft` hosted in the Hedera Token Service (HTS). It
+references HTS non-fungible tokens in the `hedera` namespace (see CAIP-75).
+
+#### Asset Reference Definition
+
+The Asset reference format is the tokenID in the specific hashgraph.
+
+#### Token ID Definition
+
+The Token ID reference format is the serial number of the token.
+
+## Rationale
+
+The tokenID is the canonical reference to the token within hedera. The serial
+number uniquely identifies each NFT in the token namespace.
+
+## Backwards Compatibility
+
+Not applicable
+
+## Test Cases
+
+This is a list of manually composed examples
+
+```
+# Edition 12 of 50: First-Generation Hedera Robot VENOM EDITION
+hedera:mainnet/nft:0.0.55492/12
+```
+
+## Links
+
+- [CAIP-19](./caip-19.md) Asset Type and Asset ID Specification
+- [CAIP-75](./caip-75.md) Blockchain Reference for the Hedera namespace
+- [HIP-15](https://github.com/hashgraph/hedera-improvement-proposal/blob/master/HIP/hip-15.md)
+  Address Checksum
+- [HIP-30](https://github.com/hashgraph/hedera-improvement-proposal/blob/master/HIP/hip-30.md)
+  CAIP Identifiers for the Hedera Network
+
+## Copyright
+
+Copyright and related rights waived
+via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).