docs: clarify Arc Testnet chain ID is 5042002, not 1516#148
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Add a Networks section to the README documenting Arc's official chain IDs and the correct wallet configuration for Arc Testnet, with a prominent note that the incorrectly-circulated value 1516 is wrong. Fixes circlefin#94
Document that testnet.arcscan.app and docs.arc.network are the canonical Arc Testnet explorer and docs, and that the dead explorer.testnet.arc.network, explorer.arc.io, and docs.arc.io URLs should not be used. Fixes circlefin#81
…laim docs.arc.io is the live canonical docs host (docs.arc.network 301-redirects to it), so it does not belong in the dead-URL list. Keep the note focused on the block explorer: testnet.arcscan.app is canonical; explorer.testnet.arc.network (unreachable) and explorer.arc.io (team-login-gated) are not publicly usable.
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Closes #94.
Fixes #81.
Summary
Arc Testnet's chain ID is
5042002(0x4cef52), but some third-party chain registries and older community guides circulate the incorrect value1516, causing wallet connection failures. Separately, several Arc Testnet block explorer URLs that circulate in external guides and wallet configs are dead (unreachable / login-gated).Note: this repo's code and config were already consistent on
5042002, and contained no dead explorer URLs — both bad values circulate outside this repo. The gap was the lack of a clear, discoverable network reference for people setting up wallets/tooling. This PR adds one.Changes
README.md:5042), Testnet (5042002), Devnet (5042001)[!IMPORTANT]callout that1516is incorrect, with acurlsnippet to verify the chain ID straight from a node (Chain ID inconsistency: some documentation references 1516, actual Arc Testnet chain ID is 5042002 #94)[!NOTE]callout namingtestnet.arcscan.appas the canonical block explorer and flagging the non-usableexplorer.testnet.arc.network(unreachable) andexplorer.arc.io(team-login-gated) URLs (docs: multiple Arc Testnet block explorer URLs are dead — testnet.arcscan.app is the live explorer #81)Out of scope
Issue #94 also suggests submitting a PR to
ethereum-lists/chains, and #81's remaining fixes live in third-party registries / MetaMask guides. Those are external registries, separate from this repo.Test plan
crates/shared/src/chain_ids.rs