EIP: Implement eth_chainId method in JSON-RPC
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| ## Preamble | ||
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| EIP: 695 | ||
| Title: Create `eth_chainId` method for JSON-RPC | ||
| Author: Isaac Ardis: isaac.ardis@gmail.com, Wei Tang: hi@that.world, [@tcz001](https://github.com/tcz001) | ||
| Type: Standard Track | ||
| Category: Interface | ||
| Status: Draft | ||
| Created: 2017-08-21 | ||
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| ## Simple Summary | ||
| Include `eth_chainId` method in `eth_`-namespaced JSON-RPC methods. | ||
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| ## Abstract | ||
| The `eth_chainId` method should return a single STRING result | ||
| for an integer value in hexadecimal format, describing the | ||
| currently configured "Chain Id" value used for signing replay-protected transactions, | ||
| introduced via EIP-155. | ||
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| ## Motivation | ||
| Currently although we can use net_version RPC call to get the | ||
| current network ID, there's no RPC for querying the chain ID. This | ||
| makes it impossible to determine the current actual blockchain using | ||
| the RPC. | ||
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| ## Specification | ||
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| ### eth_chainId | ||
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| Returns the currently configured chain id, a value used in replay-protected transaction | ||
| signing as introduced by EIP-155. | ||
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There was a problem hiding this comment. Please link |
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| ##### Parameters | ||
| none | ||
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| ##### Returns | ||
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| `QUANTITY` - big integer of the current chain id. Defaults are mainnet=61, morden=62. | ||
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There was a problem hiding this comment. JSON RPC has String, Number, Booleans or Null. I guess it's a String representing an integer. There was a problem hiding this comment. Maybe "big integer" is the usual way to say it? There was a problem hiding this comment. Also, I'll change it to There was a problem hiding this comment.
https://github.com/ethereum/wiki/wiki/JSON-RPC#hex-value-encoding There was a problem hiding this comment. Thank you. Will you add that link to the PR? Maybe in a |
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| ##### Example | ||
| ```js | ||
| curl -X POST --data '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1}' | ||
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| // Result | ||
| { | ||
| "id":83, | ||
| "jsonrpc": "2.0", | ||
| "result": "0x3d" // 61 | ||
| } | ||
| ``` | ||
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| ---- | ||
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| ## Rationale | ||
| An ETH/ETC client can accidentally connect to an ETC/ETH RPC | ||
| endpoint without knowing it unless it tries to sign a transaction or | ||
| it fetch a transaction that is known to have signed with a chain | ||
| ID. This has since caused trouble for application developers, such as | ||
| MetaMask, to add multi-chain support. | ||
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| Please note related links: | ||
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| - [Parity PR](https://github.com/paritytech/parity/pull/6329) | ||
| - [Geth Classic PR (merged)](https://github.com/ethereumproject/go-ethereum/pull/336) | ||
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| ## Backwards Compatibility | ||
| Not relevant. | ||
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| ## Test Cases | ||
| Not currently implemented. | ||
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| ## Implementation | ||
| Would be good to have a test to confirm that expected==got. | ||
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| ## Copyright | ||
| Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/). | ||
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Usually, we don't have this. It's fine for me though.