add gridZERO (gridzero-1) — Move appchain on Initia mainnet

[penguinpecker]

gridZERO is a 5×5 on-chain lottery game appchain built as a MiniMove rollup on Initia.
Pick a cell, the round resolves a winner from occupied cells every 60 seconds. Native INIT
entry, $ZERO reward emission, 1-in-100 motherlode bonus rounds (10× pot + 1000 $ZERO).

Chain summary

• Chain ID: gridzero-1
• OPinit Bridge ID: 47 (registered on interwoven-1 OPHost on 2026-05-28)
• Codebase: initia-labs/minimove v1.1.12
• DA: Initia DA
• Submission interval / finalization: 1h / 7d
• Native gas: uinit (free, fixed_min_gas_price=0 — game uses uinit as entry currency)

IBC channels (gridzero-1 ↔ interwoven-1)

• transfer: channel-0 ↔ channel-110
• nft-transfer: channel-1 ↔ channel-111

Both relayed by an active Hermes relayer (informalsystems/hermes v1.13.3); OPinit executor (opinitd v1.0.20) submits DA batches + output proposals.

Endpoints

	URL
RPC	https://gridzero-sequencer-production.up.railway.app
REST	https://gridzero-rest-production.up.railway.app
Game site	https://gridzero-initia.vercel.app

$ZERO token

Native Move FA published by gridzero::zero_token. Metadata: 0x1ed4c19b0f2410cc1773bf82d5b6d378bb61caeb821ce060018e456e72915924. Bank denom: move/1ed4c19b0f2410cc1773bf82d5b6d378bb61caeb821ce060018e456e72915924.

Repo / source

https://github.com/penguinpecker/gridzero-initia

Files changed

• mainnets/gridzero/chain.json
• mainnets/gridzero/assetlist.json
• images/gridzero.png (512×512)

Both JSON files validate against chain.schema.json + assetlist.schema.json (verified locally with jsonschema Draft7).

Summary by CodeRabbit

• New Features
  • Added GridZero mainnet support with complete chain configuration, including metadata, RPC/REST API endpoints, and supported key algorithms.
  • Added asset definitions for the GridZero chain, including the native INIT token and ZERO reward token with full metadata and branding information.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 0e32de4c-7dd7-4293-9e12-4577bf84218d

📥 Commits

Reviewing files that changed from the base of the PR and between d2adecf and 3280f27.

⛔ Files ignored due to path filters (1)

• images/gridzero.png is excluded by !**/*.png

📒 Files selected for processing (2)

• mainnets/gridzero/assetlist.json
• mainnets/gridzero/chain.json

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Walkthrough

This PR adds two JSON configuration files to register the GridZero mainnet within the Initia chain registry. The chain configuration defines network identity, RPC/REST endpoints, and metadata; the asset registry enumerates the two supported tokens (INIT and ZERO) with denom units and logo URIs.

Changes

GridZero Mainnet Registration

Layer / File(s)	Summary
Chain configuration and metadata mainnets/gridzero/chain.json	GridZero mainnet is registered with chain identity, RPC and REST endpoint URLs, genesis/codebase sources, fee parameters, key algorithms, explorer links, and Initia-specific metadata including IBC channel mappings and asset list reference.
Asset registry for supported tokens mainnets/gridzero/assetlist.json	Two assets are registered: INIT native token (with INITia bridge trace) and ZERO reward token, each with denom unit configurations and remote logo image URLs.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 A rabbit hops through GridZero's gate,
Two JSON scrolls define its fate—
INIT and ZERO, assets bright,
Chain and registry, registered just right! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and accurately describes the main change: adding gridZERO (gridzero-1), a Move appchain on Initia mainnet, which directly matches the two new configuration files being added.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 0