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docs: document official chain IDs and canonical testnet explorer
- #263
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docs: document official chain IDs and canonical testnet explorer
#263
memosr
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circlefin/arc-node:main
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memosr:docs/readme-chain-id-explorer
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Commits on Aug 14, 2026
docs: clarify Arc Testnet chain ID is 5042002, not 1516
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docs: note canonical explorer/docs URLs and flag dead ones
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docs: correct explorer note — drop inaccurate docs.arc.io dead-link claim
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docs: attribute wrong chain IDs to name collisions, not the registry
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