> For the complete documentation index, see [llms.txt](https://docs.zircofi.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zircofi.com/robinhood-chain/network-details.md).

# Network details

{% hint style="info" %}
RPC endpoints, explorer URLs and Robinhood's own contract addresses are published at [docs.robinhood.com/chain](https://docs.robinhood.com/chain/). ZircoFi contract addresses are recorded in `contracts/deployments/4663.json` and described on the [Deployment](/architecture/deployment.md) page. Always verify addresses against those sources before sending funds.
{% endhint %}

## Network

| Network         | Chain ID | Status                    | ZircoFi               |
| --------------- | -------- | ------------------------- | --------------------- |
| Robinhood Chain | 4663     | Mainnet since 1 July 2026 | Production deployment |

## Chain parameters

| Parameter               | Value                                                               |
| ----------------------- | ------------------------------------------------------------------- |
| Execution               | Arbitrum Nitro, EVM-equivalent, ArbOS 40 (EIP-7702 supported)       |
| Settlement layer        | Ethereum                                                            |
| Data availability       | Ethereum blobs (rollup mode)                                        |
| Block time              | About 250 ms                                                        |
| Preconfirmation latency | About 100 ms                                                        |
| Gas token               | ETH                                                                 |
| Median transaction cost | About $0.001                                                        |
| Canonical withdrawal    | 7 days                                                              |
| Sequencer               | Single, operated by Robinhood; sanctions screening at the sequencer |
| Forced inclusion        | L1 delayed inbox, 24-hour delay                                     |
| Explorer                | Blockscout                                                          |

## Precompiles and conventions used by ZircoFi

| Item                      | Usage                                                                                     |
| ------------------------- | ----------------------------------------------------------------------------------------- |
| `block.timestamp`         | All time-based logic: quote expiries, staleness bounds, grace periods, the timelock       |
| `block.number`            | Never used for time; on Arbitrum it reflects the L1 block                                 |
| `ArbSys.arbBlockNumber()` | Only where an L2 block height is required, for example in event metadata                  |
| Compressed calldata       | RFQ quote structs are packed and signatures compacted because L1 data cost dominates fees |

## Standards in use

| Standard | Where                                                                   |
| -------- | ----------------------------------------------------------------------- |
| ERC-20   | Stock Tokens (18 decimals), USDG (6 decimals)                           |
| ERC-8056 | Stock Token corporate actions, `uiMultiplier()`                         |
| ERC-4626 | Vault share accounting (with dual-asset, in-kind withdrawal extensions) |
| EIP-712  | RFQ quote signing                                                       |
| EIP-1271 | Smart-account signature validation for maker quotes                     |
| ERC-4337 | Account abstraction entry points v0.6 to v0.8                           |
| EIP-7702 | EOA delegation to smart-account code                                    |
| Permit2  | Allowance-based pulls at settlement, for takers and makers              |
| EAS      | Eligibility attestations                                                |

## Chainlink services on chain 4663

| Service                    | Purpose in ZircoFi                           |
| -------------------------- | -------------------------------------------- |
| Data Feeds (24/5 equities) | The mid for vault quoting and band checks    |
| Data Streams (v11 RWA)     | Session classification and fill cross-checks |
| Sequencer Uptime Feed      | Post-outage trading grace                    |
| CCIP                       | Bridged treasuries and gold (roadmap)        |
| ACE / CCID                 | Alternative eligibility adapter              |


---

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