evmos · fedekunze · Aug 17, 2021 · Aug 17, 2021 · Aug 17, 2021 · Aug 17, 2021
@@ -39,6 +39,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### State Machine Breaking
 
+* (app, rpc) [tharsis#447](https://github.com/tharsis/ethermint/pull/447) Chain ID format has been changed from `<identifier>-<epoch>` to `<identifier>_<EIP155_number>-<epoch>`
+in order to clearly distinguish permanent vs impermanent components.
 * (app, evm) [tharsis#434](https://github.com/tharsis/ethermint/pull/434) EVM `Keeper` struct and `NewEVM` function now have a new `trace` field to define
 the Tracer type used to collect execution traces from the EVM transaction execution.
 * (evm) [tharsis#175](https://github.com/tharsis/ethermint/issues/175) The msg `TxData` field is now represented as a `*proto.Any`.

@@ -44,7 +44,7 @@ type AnteTestSuite struct {
 func (suite *AnteTestSuite) SetupTest() {
 	checkTx := false
 	suite.app = app.Setup(checkTx)
-	suite.ctx = suite.app.BaseApp.NewContext(checkTx, tmproto.Header{Height: 2, ChainID: "ethermint-1", Time: time.Now().UTC()})
+	suite.ctx = suite.app.BaseApp.NewContext(checkTx, tmproto.Header{Height: 2, ChainID: "ethermint_9000-1", Time: time.Now().UTC()})
 	suite.ctx = suite.ctx.WithMinGasPrices(sdk.NewDecCoins(sdk.NewDecCoin(evmtypes.DefaultEVMDenom, sdk.OneInt())))
 	suite.ctx = suite.ctx.WithBlockGasMeter(sdk.NewGasMeter(1000000000000000000))
 	suite.app.EvmKeeper.WithChainID(suite.ctx)

@@ -27,7 +27,7 @@ func TestEthermintAppExport(t *testing.T) {
 	// Initialize the chain
 	app.InitChain(
 		abci.RequestInitChain{
-			ChainId:       "ethermint-1",
+			ChainId:       "ethermint_9000-1",
 			Validators:    []abci.ValidatorUpdate{},
 			AppStateBytes: stateBytes,
 		},

@@ -48,7 +48,7 @@ func Setup(isCheckTx bool) *EthermintApp {
 		// Initialize the chain
 		app.InitChain(
 			abci.RequestInitChain{
-				ChainId:         "ethermint-1",
+				ChainId:         "ethermint_9000-1",
 				Validators:      []abci.ValidatorUpdate{},
 				ConsensusParams: DefaultConsensusParams,
 				AppStateBytes:   stateBytes,

@@ -130,7 +130,7 @@ func InitTestnet(
 ) error {
 
 	if chainID == "" {
-		chainID = fmt.Sprintf("ethermint-%d", tmrand.Int63n(9999999999999)+1)
+		chainID = fmt.Sprintf("ethermint_%d-1", tmrand.Int63n(9999999999999)+1)
 	}
 
 	if !ethermint.IsValidChainID(chainID) {

@@ -17,10 +17,10 @@ import (
 func TestInitCmd(t *testing.T) {
 	rootCmd, _ := ethermintd.NewRootCmd()
 	rootCmd.SetArgs([]string{
-		"init",           // Test the init cmd
-		"ethermint-test", // Moniker
+		"init",          // Test the init cmd
+		"etherminttest", // Moniker
 		fmt.Sprintf("--%s=%s", cli.FlagOverwrite, "true"), // Overwrite genesis.json, in case it already exists
-		fmt.Sprintf("--%s=%s", flags.FlagChainID, "ethermint-1"),
+		fmt.Sprintf("--%s=%s", flags.FlagChainID, "ethermint_9000-1"),
 	})
 
 	err := svrcmd.Execute(rootCmd, app.DefaultNodeHome)

@@ -18,7 +18,7 @@ init:
       address: "0.0.0.0:8545"     # change the JSON-RPC address and port
       ws-address: "0.0.0.0:8546"  # change the JSON-RPC websocket address and port
 genesis:
-  chain_id: "ethermint-2"
+  chain_id: "ethermint_9000-1"
   app_state:
     staking:
       params:

@@ -8,9 +8,10 @@ parent:
 
 This repository contains reference documentation on the basic concepts of Ethermint.
 
+1. [Chain ID](./chain_id)
 1. [Accounts](./accounts)
-2. [Gas and Fees](./gas)
-3. [Lifecycle of a transaction](./transactions)
-4. [Tokens](./tokens)
+1. [Gas and Fees](./gas)
+1. [Lifecycle of a transaction](./transactions)
+1. [Tokens](./tokens)
 
 After reading the basics, head on to the [Core Reference](../core/README) for more advanced material.
@@ -1,5 +1,5 @@
 <!--
-order: 1
+order: 2
 -->
 
 # Accounts

@@ -0,0 +1,36 @@
+<!--
+order: 1
+-->
+
+# Chain ID
+
+Learn about the Ethermint chain-id format {synopsis}
+
+## The Chain Identifier
+
+Every chain must have a unique identifier or `chain-id`. Tendermint requires each application to
+define its own `chain-id` in the [genesis.json fields](https://docs.tendermint.com/master/spec/core/genesis.html#genesis-fields). However, in order to comply with both EIP155 and Cosmos standard for chain upgrades, Ethermint-compatible chains must implement a special structure for their chain identifiers.
+
+## Structure
+
+The Ethermint Chain ID contains 3 main components
+
+- **Identifier**: Unstructured string that defines the name of the application.
+- **EIP155 Number**: Immutable [EIP155](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-155.md) `CHAIN_ID` that defines the replay attack protection number.
+- **Version Number**: Is the version number (always positive) that the chain is currently running.
+This number **MUST** be incremented every time the chain is upgraded or forked in order to avoid network or consensus errors.
+
+### Format
+
+The format for specifying and Ethermint compatible chain-id in genesis is the following:
+
+```bash
+{identifier}_{EIP155}-{version}
+```
+
+The following table provides an example where the second row corresponds to an upgrade from the first one:
+
+| ChainID            | Identifier | EIP155 Number | Version Number |
+|--------------------|------------|---------------|----------------|
+| `ethermint_9000-1` | ethermint  | 9000          | 1              |
+| `ethermint_9000-2` | ethermint  | 9000          | 2              |
@@ -1,5 +1,5 @@
 <!--
-order: 3
+order: 4
 -->
 
 # Gas and Fees

@@ -1,5 +1,5 @@
 <!--
-order: 4
+order: 5
 -->
 
 # Tokens

@@ -1,5 +1,5 @@
 <!--
-order: 2
+order: 3
 -->
 
 # Transactions

@@ -15,8 +15,8 @@ are not already. Then click the top right circle and go to `Settings` > `Network
 Network` button and fill the form as shown below with your application `ChainID`.
 
 ::: tip
-To find your full `ChainID`, got your genesis.json file. To get the Ethereum chain ID from the Cosmos chain ID, you need to consider only the last digit in the string value. For example
-if your chain id on ethermint is `"chain_id": "ethermint-1337"`, then you will have to use the value `1337` on Metamask.
+To find your full `ChainID`, got your genesis.json file. To get the [EIP155](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-155.md) chain ID from the Cosmos chain ID, you need to consider only the second number in the string value. For example
+if your chain id on ethermint is `"chain_id": "ethermint_9000-1"`, then you will have to use the value `9000` on Metamask.
 :::
 
 ![metamask networks settings](./../img/metamask_network_settings.png)

@@ -24,7 +24,7 @@ This guide helps you create a single validator node that runs a network locally
 ```bash
 $MONIKER=testing
 $KEY=mykey
-$CHAINID="ethermint-777"
+$CHAINID="ethermint_9000-1"
 
 ethermintd init $MONIKER --chain-id=$CHAINID
 ```

@@ -63,13 +63,13 @@ ethermintd config
 
 We can make changes to the default settings upon our choices, so it allows users to set the configuration beforehand all at once, so it would be ready with the same config afterward.
 
-For example, the chain identifier can be changed to `ethermint-777` from a blank name by using:
+For example, the chain identifier can be changed to `ethermint_9000-1` from a blank name by using:
 
 ```bash
-ethermintd config "chain-id" ethermint-777
+ethermintd config "chain-id" ethermint_9000-1
 ethermintd config
 {
- "chain-id": "ethermint-777",
+ "chain-id": "ethermint_9000-1",
  "keyring-backend": "os",
  "output": "text",
  "node": "tcp://localhost:26657",
@@ -89,7 +89,7 @@ Alternatively, we can directly make the changes to the config values in one plac
 
 # The network chain ID
 
-chain-id = "ethermint-777"
+chain-id = "ethermint_9000-1"
 
 # The keyring's backend, where the keys are stored (os|file|kwallet|pass|test|memory)
 
@@ -108,12 +108,12 @@ node = "tcp://localhost:26657"
 broadcast-mode = "sync"
 ```
 
-After the necessary changes are made in the `client.toml`, then save. For example, if we directly change the chain-id from `ethermint-0` to `etherminttest-1`, and output to number, it would change instantly as shown below.
+After the necessary changes are made in the `client.toml`, then save. For example, if we directly change the chain-id from `ethermint_9000-1` to `etherminttest_9000-1`, and output to number, it would change instantly as shown below.
 
 ```bash
 ethermintd config
 {
- "chain-id": "etherminttest-1",
+ "chain-id": "etherminttest_9000-1",
  "keyring-backend": "os",
  "output": "number",
  "node": "tcp://localhost:26657",
@@ -126,7 +126,7 @@ ethermintd config
 A list of commonly used flags of `ethermintd` is listed below:
 
 | Option              | Description                   | Type         | Default Value   |
-| ------------------- | ----------------------------- | ------------ | --------------- |
+|---------------------|-------------------------------|--------------|-----------------|
 | `--chain-id`        | Full Chain ID                 | String       | ---             |
 | `--home`            | Directory for config and data | string       | `~/.ethermintd` |
 | `--keyring-backend` | Select keyring's backend      | os/file/test | os              |
@@ -136,13 +136,13 @@ A list of commonly used flags of `ethermintd` is listed below:
 
 A list of commonly used `ethermintd` commands. You can obtain the full list by using the `ethermintd -h` command.
 
-| Command         | Description              | Subcommands (example)                                        |
-| --------------- | ------------------------ | ------------------------------------------------------------ |
-| `keys`          | Keys management          | `list`, `show`, `add`, `add  --recover`, `delete`                |
-| `tx`            | Transactions subcommands | `bank send`, `ibc-transfer transfer`, `distribution withdraw-all-rewards` |
-| `query`         | Query subcommands        | `bank balance`, `staking validators`, `gov proposals`                          |
-| `tendermint`    | Tendermint subcommands   | `show-address`, `show-node-id`, `version`                                |
-| `config` | Client configuration     |                                                              |
-| `init`  | Initialize full node     |                                                              |
-| `start` | Run full node            |                                                              |
-|     `version`            |     Ethermint version                     |                                                              |
+| Command      | Description              | Subcommands (example)                                                     |
+|--------------|--------------------------|---------------------------------------------------------------------------|
+| `keys`       | Keys management          | `list`, `show`, `add`, `add  --recover`, `delete`                         |
+| `tx`         | Transactions subcommands | `bank send`, `ibc-transfer transfer`, `distribution withdraw-all-rewards` |
+| `query`      | Query subcommands        | `bank balance`, `staking validators`, `gov proposals`                     |
+| `tendermint` | Tendermint subcommands   | `show-address`, `show-node-id`, `version`                                 |
+| `config`     | Client configuration     |                                                                           |
+| `init`       | Initialize full node     |                                                                           |
+| `start`      | Run full node            |                                                                           |
+| `version`    | Ethermint version        |                                                                           |
@@ -9,7 +9,7 @@ rem 3. add path C:\msys64\mingw64\bin
 rem             C:\msys64\usr\bin
 
 set KEY="mykey"
-set CHAINID="ethermint-2"
+set CHAINID="ethermint_9000-1"
 set MONIKER="localtestnet"
 set KEYRING="test"
 set KEYALGO="eth_secp256k1"

@@ -1,6 +1,6 @@
 
 KEY="mykey"
-CHAINID="ethermint-2"
+CHAINID="ethermint_9000-1"
 MONIKER="localtestnet"
 KEYRING="test"
 KEYALGO="eth_secp256k1"

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 KEY="mykey"
-CHAINID="ethermint-100"
+CHAINID="ethermint_9000-1"
 MONIKER="localtestnet"
 
 # stop and remove existing daemon and client data and process(es)

@@ -17,7 +17,7 @@ RPC_PORT="854"
 IP_ADDR="0.0.0.0"
 
 KEY="mykey"
-CHAINID="ethermint-2"
+CHAINID="ethermint_9000-1"
 MONIKER="mymoniker"
 
 ## default port prefixes for ethermintd

@@ -10,7 +10,7 @@ localKeyAddr=0x7cb61d4117ae31a12e393a1cfa3bac666481d02e
 user1Addr=0xc6fe5d33615a1c52c08018c47e8bc53646a0e101
 user2Addr=0x963ebdf2e1f8db8707d05fc75bfeffba1b5bac17
 
-CHAINID="ethermint-1337"
+CHAINID="ethermint_9000-1"
 
 # build ethermint binary
 make install

@@ -15,7 +15,7 @@ IP_ADDR="0.0.0.0"
 MODE="rpc"
 
 KEY="mykey"
-CHAINID="ethermint-2"
+CHAINID="ethermint_9000-1"
 MONIKER="mymoniker"
 
 ## default port prefixes for ethermintd
@@ -47,14 +47,14 @@ done
 
 set -euxo pipefail
 
-DATA_DIR=$(mktemp -d -t ethermint-datadir.XXXXX)
+DATA_DIR=$(mktemp -d -t ethermint_9000-datadir.XXXXX)
 
 if [[ ! "$DATA_DIR" ]]; then
     echo "Could not create $DATA_DIR"
     exit 1
 fi
 
-DATA_CLI_DIR=$(mktemp -d -t ethermint-cli-datadir.XXXXX)
+DATA_CLI_DIR=$(mktemp -d -t ethermint_9000-cli-datadir.XXXXX)
 
 if [[ ! "$DATA_CLI_DIR" ]]; then
     echo "Could not create $DATA_CLI_DIR"

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-CHAINID="ethermint-1337"
+CHAINID="ethermint_9000-1"
 MONIKER="localtestnet"
 
 # localKey address 0x7cb61d4117ae31a12e393a1cfa3bac666481d02e

@@ -117,7 +117,7 @@ func DefaultConfig() Config {
 		AppConstructor:    NewAppConstructor(encCfg),
 		GenesisState:      app.NewDefaultGenesisState(),
 		TimeoutCommit:     2 * time.Second,
-		ChainID:           "ethermint-" + fmt.Sprintf("%d", tmrand.NewRand().Int63n(1000)),
+		ChainID:           "ethermint_9000-" + fmt.Sprintf("%d", tmrand.NewRand().Int63n(1000)),
 		NumValidators:     4,
 		BondDenom:         ethermint.AttoPhoton,
 		MinGasPrices:      fmt.Sprintf("0.000006%s", ethermint.AttoPhoton),

@@ -10,10 +10,12 @@ import (
 )
 
 var (
-	regexChainID     = `[a-z]*`
-	regexSeparator   = `-{1}`
-	regexEpoch       = `[1-9][0-9]*`
-	ethermintChainID = regexp.MustCompile(fmt.Sprintf(`^(%s)%s(%s)$`, regexChainID, regexSeparator, regexEpoch))
+	regexChainID         = `[a-z]{1,}`
+	regexEIP155Separator = `_{1}`
+	regexEIP155          = `[1-9][0-9]*`
+	regexEpochSeparator  = `-{1}`
+	regexEpoch           = `[1-9][0-9]*`
+	ethermintChainID     = regexp.MustCompile(fmt.Sprintf(`^(%s)%s(%s)%s(%s)$`, regexChainID, regexEIP155Separator, regexEIP155, regexEpochSeparator, regexEpoch))
 )
 
 // IsValidChainID returns false if the given chain identifier is incorrectly formatted.
@@ -34,8 +36,8 @@ func ParseChainID(chainID string) (*big.Int, error) {
 	}
 
 	matches := ethermintChainID.FindStringSubmatch(chainID)
-	if matches == nil || len(matches) != 3 || matches[1] == "" {
-		return nil, sdkerrors.Wrap(ErrInvalidChainID, chainID)
+	if matches == nil || len(matches) != 4 || matches[1] == "" {
+		return nil, sdkerrors.Wrapf(ErrInvalidChainID, "%s: %v", chainID, matches)
 	}
 
 	// verify that the chain-id entered is a base 10 integer