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Author: williamrobertson13

sui/README.md

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+---
+namespace-identifier: sui
+title: Sui Ecosystem
+author: William Robertson (@williamrobertson13)
+discussions-to: https://github.com/ChainAgnostic/namespaces/pull/146
+status: Draft
+type: Informational
+created: 2025-06-18
+updated: 2025-06-18
+---
+
+# Namespace for Sui Chains
+
+Sui is a smart contract platform that uses a Move-based, object-centric data model and is optimized for parallel execution. Transactions in Sui operate on objects rather than accounts, allowing independent operations to be executed in parallel without coordination. This enables high throughput while preserving safety and determinism.
+
+A Sui network is maintained by a validator committee responsible for processing transactions, reaching consensus, and producing checkpoint digests — cryptographic summaries of network state at fixed intervals. These checkpoints serve as the canonical state and ensure consistency across nodes.
+
+Each network is uniquely identified by its genesis checkpoint digest — the cryptographic hash of the very first checkpoint, signed by the original validator set. This digest anchors the network’s identity in verifiable history and validator consensus.
+
+## Rationale
+
+Because chain identity and state in Sui revolve around checkpoints and objects rather than blocks and accounts, standard CAIP identifiers (e.g., for chains, accounts, and assets) must be adapted accordingly.
+
+This namespace defines how Sui’s architecture maps to cross-chain standards to support consistent and interoperable multi-chain tooling.
+
+## Governance
+
+Sui protocol upgrades and standards are coordinated by the Sui Foundation in collaboration with core contributors and the broader developer community. Changes are proposed through SIPs (Sui Improvement Proposals), with open discussion and reference implementations maintained on GitHub.
+
+## References
+
+- [Sui Docs] — Developer documentation and concept overviews for building on Sui.
+- [Sui GitHub] — Official GitHub repository for the Sui smart contract platform.
+- [Sui SIPs] — Official GitHub repository for Sui Improvement Proposals.
+
+[Sui Docs]: https://docs.sui.io/
+[Sui GitHub]: https://github.com/MystenLabs/sui
+[Sui SIPs]: https://github.com/sui-foundation/sips
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).

sui/caip2.md

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+---
+namespace-identifier: sui-caip2
+title: Sui Namespace - Chains
+author: William Robertson (@williamrobertson13)
+discussions-to: https://github.com/ChainAgnostic/namespaces/pull/146
+status: Draft
+type: Informational
+created: 2025-06-18
+updated: 2025-06-18
+---
+
+# CAIP-2
+
+_For context, see the [CAIP-2][] specification._
+
+## Introduction
+
+The Sui namespace in CAIP-2 defines chain identifiers based on the **genesis checkpoint digest**, a cryptographically unique and immutable value derived from the first checkpoint of a Sui network. This ensures that identifiers are stable, verifiable, and unambiguous.
+
+## Specification
+
+### Semantics
+
+A valid CAIP-2 identifier in the Sui namespace takes the form:
+
+```
+sui:<genesis_checkpoint_digest>
+```
+
+Where `<genesis_checkpoint_digest>` is the first 4 bytes (8 hex characters) of the network’s genesis checkpoint digest.
+
+### Syntax
+
+#### Regular Expression
+
+```
+^sui:[0-9a-fA-F]{8}$
+```
+
+#### Example
+
+```
+sui:35834a8a
+```
+
+### Resolution Mechanics
+
+To resolve a CAIP-2 chain identifier, clients query a trusted full node associated with the specified network. While the `suix_getChainIdentifier` JSON-RPC method is commonly used for this purpose, resolution is not limited to JSON-RPC. Other interfaces, such as GraphQL, may also support retrieving the corresponding genesis checkpoint digest.
+
+**Sample request:**
+
+```json
+{
+  "jsonrpc": "2.0",
+  "id": 1,
+  "method": "suix_getChainIdentifier",
+  "params": []
+}
+```
+
+**Sample response:**
+
+```json
+{
+  "jsonrpc": "2.0",
+  "id": 1,
+  "result": "35834a8a"
+}
+```
+
+## Rationale
+
+This approach advocates for the exclusive use of unambiguous chain identifiers for identifying Sui chains in CAIP-2 format.
+
+While human-readable identifiers like `sui:mainnet` or `sui:testnet` are intuitive, they are not stable over time. Networks like testnet and devnet may be reset by Sui maintainers, resulting in a new genesis state. When this happens, the associated digest changes, meaning the underlying chain is no longer the same, even if the CAIP-2 identifier remains unchanged.
+
+Using the digest-based identifier directly avoids this ambiguity by ensuring all references point to a specific, verifiable chain instance. This eliminates reliance on potentially outdated or re-used labels and simplifies validation logic.
+
+By relying solely on unambiguous identifiers, we prioritize long-term compatibility, security, and correctness. This ensures that clients consistently interact with the intended chain, even as network environments evolve.
+
+### Backwards Compatibility
+
+There are no legacy identifiers or alternate forms for Sui chains.
+
+## Test Cases
+
+Below are manually composed examples:
+
+```
+# CAIP-2 Chain ID for Mainnet**
+sui:35834a8a
+
+# CAIP-2 Chain ID for Testnet**
+sui:4c78adac
+
+# CAIP-2 Chain ID for Devnet**
+sui:aba3e445
+```
+
+## References
+
+- [Sui Docs] - Developer documentation and concept overviews for building on Sui.
+- [Sui RPC] - Reference documentation for interacting with Sui networks via RPC.
+- [Sui GitHub] - Official GitHub repository for the Sui smart contract platform.
+- [CAIP-2] - Chain ID Specification.
+
+[Sui Docs]: https://docs.sui.io/
+[Sui RPC]: https://docs.sui.io/references/sui-api
+[Sui GitHub]: https://github.com/MystenLabs/sui
+[CAIP-2]: https://chainagnostic.org/CAIPs/caip-2
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).