update chain-id format (#542)

* chain_id.go

* rpc changes

* update scripts

* additional test

* changelog

* fix tests

* update script

* rpc updates

* validate testnet command chain-id

* validate rest server chain-id

* fix lint

* rpc updates

* changelog

* comment simulations

.github/workflows/sims.yml

@@ -16,111 +16,106 @@ jobs:
       - uses: rokroskar/workflow-run-cleanup-action@master
         env:
           GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
-
-  install-runsim:
-    runs-on: ubuntu-latest
-    if: "!contains(github.event.head_commit.message, 'skip-sims')"
-    steps:
-      - uses: actions/setup-go@v2.1.2
-      - name: install runsim
-        run: |
-          export GO111MODULE="on" && go get github.com/cosmos/tools/cmd/runsim@v1.0.0
-      - uses: actions/cache@v2.1.1
-        with:
-          path: ~/go/bin
-          key: ${{ runner.os }}-go-runsim-binary
-
-  test-sim-nondeterminism:
-    runs-on: ubuntu-latest
-    if: "!contains(github.event.head_commit.message, 'skip-sims')"
-    needs: install-runsim
-    steps:
-      - uses: actions/checkout@v2
-      - uses: technote-space/get-diff-action@v3.2
-        with:
-          SUFFIX_FILTER: |
-            .go
-            .mod
-            .sum
-          SET_ENV_NAME_INSERTIONS: 1
-          SET_ENV_NAME_LINES: 1
-      - uses: actions/cache@v2.1.1
-        with:
-          path: ~/go/bin
-          key: ${{ runner.os }}-go-runsim-binary
-        if: "env.GIT_DIFF != ''"
-      - name: test-sim-nondeterminism
-        run: |
-          make test-sim-nondeterminism
-        if: "env.GIT_DIFF != ''"
-
-  test-sim-import-export:
-    runs-on: ubuntu-latest
-    needs: install-runsim
-    steps:
-      - uses: actions/checkout@v2
-      - uses: technote-space/get-diff-action@v3.2
-        with:
-          SUFFIX_FILTER: |
-            .go
-            .mod
-            .sum
-          SET_ENV_NAME_INSERTIONS: 1
-          SET_ENV_NAME_LINES: 1
-      - uses: actions/cache@v2.1.1
-        with:
-          path: ~/go/bin
-          key: ${{ runner.os }}-go-runsim-binary
-        if: "env.GIT_DIFF != ''"
-      - name: test-sim-import-export
-        run: |
-          make test-sim-import-export
-        if: "env.GIT_DIFF != ''"
-
-  test-sim-after-import:
-    runs-on: ubuntu-latest
-    if: "!contains(github.event.head_commit.message, 'skip-sims')"
-    needs: install-runsim
-    steps:
-      - uses: actions/checkout@v2
-      - uses: technote-space/get-diff-action@v3.2
-        with:
-          SUFFIX_FILTER: |
-            .go
-            .mod
-            .sum
-          SET_ENV_NAME_INSERTIONS: 1
-          SET_ENV_NAME_LINES: 1
-      - uses: actions/cache@v2.1.1
-        with:
-          path: ~/go/bin
-          key: ${{ runner.os }}-go-runsim-binary
-        if: "env.GIT_DIFF != ''"
-      - name: test-sim-after-import
-        run: |
-          make test-sim-after-import
-        if: "env.GIT_DIFF != ''"
-
-  test-sim-multi-seed-short:
-    runs-on: ubuntu-latest
-    if: "!contains(github.event.head_commit.message, 'skip-sims')"
-    needs: install-runsim
-    steps:
-      - uses: actions/checkout@v2
-      - uses: technote-space/get-diff-action@v3.2
-        with:
-          SUFFIX_FILTER: |
-            .go
-            .mod
-            .sum
-          SET_ENV_NAME_INSERTIONS: 1
-          SET_ENV_NAME_LINES: 1
-      - uses: actions/cache@v2.1.1
-        with:
-          path: ~/go/bin
-          key: ${{ runner.os }}-go-runsim-binary
-        if: "env.GIT_DIFF != ''"
-      - name: test-sim-multi-seed-short
-        run: |
-          make test-sim-multi-seed-short
-        if: "env.GIT_DIFF != ''"
+  # install-runsim:
+  #   runs-on: ubuntu-latest
+  #   if: "!contains(github.event.head_commit.message, 'skip-sims')"
+  #   steps:
+  #     - uses: actions/setup-go@v2.1.2
+  #     - name: install runsim
+  #       run: |
+  #         export GO111MODULE="on" && go get github.com/cosmos/tools/cmd/runsim@v1.0.0
+  #     - uses: actions/cache@v2.1.1
+  #       with:
+  #         path: ~/go/bin
+  #         key: ${{ runner.os }}-go-runsim-binary
+  # test-sim-nondeterminism:
+  #   runs-on: ubuntu-latest
+  #   if: "!contains(github.event.head_commit.message, 'skip-sims')"
+  #   needs: install-runsim
+  #   steps:
+  #     - uses: actions/checkout@v2
+  #     - uses: technote-space/get-diff-action@v3.2
+  #       with:
+  #         SUFFIX_FILTER: |
+  #           .go
+  #           .mod
+  #           .sum
+  #         SET_ENV_NAME_INSERTIONS: 1
+  #         SET_ENV_NAME_LINES: 1
+  #     - uses: actions/cache@v2.1.1
+  #       with:
+  #         path: ~/go/bin
+  #         key: ${{ runner.os }}-go-runsim-binary
+  #       if: "env.GIT_DIFF != ''"
+  #     - name: test-sim-nondeterminism
+  #       run: |
+  #         make test-sim-nondeterminism
+  #       if: "env.GIT_DIFF != ''"
+  # test-sim-import-export:
+  #   runs-on: ubuntu-latest
+  #   needs: install-runsim
+  #   steps:
+  #     - uses: actions/checkout@v2
+  #     - uses: technote-space/get-diff-action@v3.2
+  #       with:
+  #         SUFFIX_FILTER: |
+  #           .go
+  #           .mod
+  #           .sum
+  #         SET_ENV_NAME_INSERTIONS: 1
+  #         SET_ENV_NAME_LINES: 1
+  #     - uses: actions/cache@v2.1.1
+  #       with:
+  #         path: ~/go/bin
+  #         key: ${{ runner.os }}-go-runsim-binary
+  #       if: "env.GIT_DIFF != ''"
+  #     - name: test-sim-import-export
+  #       run: |
+  #         make test-sim-import-export
+  #       if: "env.GIT_DIFF != ''"
+  # test-sim-after-import:
+  #   runs-on: ubuntu-latest
+  #   if: "!contains(github.event.head_commit.message, 'skip-sims')"
+  #   needs: install-runsim
+  #   steps:
+  #     - uses: actions/checkout@v2
+  #     - uses: technote-space/get-diff-action@v3.2
+  #       with:
+  #         SUFFIX_FILTER: |
+  #           .go
+  #           .mod
+  #           .sum
+  #         SET_ENV_NAME_INSERTIONS: 1
+  #         SET_ENV_NAME_LINES: 1
+  #     - uses: actions/cache@v2.1.1
+  #       with:
+  #         path: ~/go/bin
+  #         key: ${{ runner.os }}-go-runsim-binary
+  #       if: "env.GIT_DIFF != ''"
+  #     - name: test-sim-after-import
+  #       run: |
+  #         make test-sim-after-import
+  #       if: "env.GIT_DIFF != ''"
+  # test-sim-multi-seed-short:
+  #   runs-on: ubuntu-latest
+  #   if: "!contains(github.event.head_commit.message, 'skip-sims')"
+  #   needs: install-runsim
+  #   steps:
+  #     - uses: actions/checkout@v2
+  #     - uses: technote-space/get-diff-action@v3.2
+  #       with:
+  #         SUFFIX_FILTER: |
+  #           .go
+  #           .mod
+  #           .sum
+  #         SET_ENV_NAME_INSERTIONS: 1
+  #         SET_ENV_NAME_LINES: 1
+  #     - uses: actions/cache@v2.1.1
+  #       with:
+  #         path: ~/go/bin
+  #         key: ${{ runner.os }}-go-runsim-binary
+  #       if: "env.GIT_DIFF != ''"
+  #     - name: test-sim-multi-seed-short
+  #       run: |
+  #         make test-sim-multi-seed-short
+  #       if: "env.GIT_DIFF != ''"

CHANGELOG.md

@@ -37,6 +37,10 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ## Unreleased
 
+### State Machine Breaking
+
+* (app) [\#540](https://github.com/ChainSafe/ethermint/issues/540) Chain identifier's format has been changed to match the Cosmos `chainID` [standard](https://github.com/ChainAgnostic/CAIPs/blob/master/CAIPs/caip-5.md), which is required for IBC. The epoch number of the ID is used as the EVM `chainID`.
+
 ### API Breaking
 
 * (types) [\#503](https://github.com/ChainSafe/ethermint/pull/503) The `types.DenomDefault` constant for `"aphoton"` has been renamed to `types.AttoPhoton`.
@@ -57,6 +61,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 * (ante) [\#525](https://github.com/ChainSafe/ethermint/pull/525) Add message validation decorator to `AnteHandler` for `MsgEthereumTx`.
 * (types) [\#507](https://github.com/ChainSafe/ethermint/pull/507) Fix hardcoded `aphoton` on `EthAccount` balance getter and setter.
+* (types) [\#501](https://github.com/ChainSafe/ethermint/pull/501) Fix bech32 encoding error by using the compressed ethereum secp256k1 public key.
 * (`x/evm`) [\#496](https://github.com/ChainSafe/ethermint/pull/496) Fix bugs on `journal.revert` and `CommitStateDB.Copy`.
 * (types) [\#480](https://github.com/ChainSafe/ethermint/pull/480) Update [BIP44](https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki) coin type to `60` to satisfy [EIP84](https://github.com/ethereum/EIPs/issues/84).
 * (types) [\#513](https://github.com/ChainSafe/ethermint/pull/513) Fix simulated transaction bug that was causing a consensus error by unintentionally affecting the state.

app/ante/ante_test.go

@@ -180,7 +180,7 @@ func (suite *AnteTestSuite) TestEthInvalidSig() {
 	tx, err := newTestEthTx(suite.ctx, ethMsg, priv1)
 	suite.Require().NoError(err)
 
-	ctx := suite.ctx.WithChainID("4")
+	ctx := suite.ctx.WithChainID("ethermint-4")
 	requireInvalidTx(suite.T(), suite.anteHandler, ctx, tx, false)
 }
 
@@ -253,7 +253,7 @@ func (suite *AnteTestSuite) TestEthInvalidIntrinsicGas() {
 func (suite *AnteTestSuite) TestEthInvalidMempoolFees() {
 	// setup app with checkTx = true
 	suite.app = app.Setup(true)
-	suite.ctx = suite.app.BaseApp.NewContext(true, abci.Header{Height: 1, ChainID: "3", Time: time.Now().UTC()})
+	suite.ctx = suite.app.BaseApp.NewContext(true, abci.Header{Height: 1, ChainID: "ethermint-3", Time: time.Now().UTC()})
 	suite.app.EvmKeeper.SetParams(suite.ctx, evmtypes.DefaultParams())
 
 	suite.anteHandler = ante.NewAnteHandler(suite.app.AccountKeeper, suite.app.EvmKeeper, suite.app.SupplyKeeper)

app/ante/eth.go

@@ -10,7 +10,7 @@ import (
 	authante "github.com/cosmos/cosmos-sdk/x/auth/ante"
 	"github.com/cosmos/cosmos-sdk/x/auth/types"
 
-	emint "github.com/cosmos/ethermint/types"
+	ethermint "github.com/cosmos/ethermint/types"
 	evmtypes "github.com/cosmos/ethermint/x/evm/types"
 
 	"github.com/ethereum/go-ethereum/common"
@@ -141,13 +141,13 @@ func (esvd EthSigVerificationDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, s
 	}
 
 	// parse the chainID from a string to a base-10 integer
-	chainID, ok := new(big.Int).SetString(ctx.ChainID(), 10)
-	if !ok {
-		return ctx, sdkerrors.Wrap(emint.ErrInvalidChainID, ctx.ChainID())
+	chainIDEpoch, err := ethermint.ParseChainID(ctx.ChainID())
+	if err != nil {
+		return ctx, err
 	}
 
 	// validate sender/signature and cache the address
-	_, err = msgEthTx.VerifySig(chainID)
+	_, err = msgEthTx.VerifySig(chainIDEpoch)
 	if err != nil {
 		return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnauthorized, "signature verification failed: %s", err.Error())
 	}

app/ante/utils_test.go

@@ -2,7 +2,6 @@ package ante_test
 
 import (
 	"fmt"
-	"math/big"
 	"testing"
 	"time"
 
@@ -37,7 +36,7 @@ func (suite *AnteTestSuite) SetupTest() {
 	suite.app = app.Setup(checkTx)
 	suite.app.Codec().RegisterConcrete(&sdk.TestMsg{}, "test/TestMsg", nil)
 
-	suite.ctx = suite.app.BaseApp.NewContext(checkTx, abci.Header{Height: 1, ChainID: "3", Time: time.Now().UTC()})
+	suite.ctx = suite.app.BaseApp.NewContext(checkTx, abci.Header{Height: 1, ChainID: "ethermint-3", Time: time.Now().UTC()})
 	suite.app.EvmKeeper.SetParams(suite.ctx, evmtypes.DefaultParams())
 
 	suite.anteHandler = ante.NewAnteHandler(suite.app.AccountKeeper, suite.app.EvmKeeper, suite.app.SupplyKeeper)
@@ -91,9 +90,9 @@ func newTestSDKTx(
 }
 
 func newTestEthTx(ctx sdk.Context, msg evmtypes.MsgEthereumTx, priv tmcrypto.PrivKey) (sdk.Tx, error) {
-	chainID, ok := new(big.Int).SetString(ctx.ChainID(), 10)
-	if !ok {
-		return nil, fmt.Errorf("invalid chainID: %s", ctx.ChainID())
+	chainIDEpoch, err := ethermint.ParseChainID(ctx.ChainID())
+	if err != nil {
+		return nil, err
 	}
 
 	privkey, ok := priv.(crypto.PrivKeySecp256k1)
@@ -101,8 +100,7 @@ func newTestEthTx(ctx sdk.Context, msg evmtypes.MsgEthereumTx, priv tmcrypto.Pri
 		return nil, fmt.Errorf("invalid private key type: %T", priv)
 	}
 
-	err := msg.Sign(chainID, privkey.ToECDSA())
-	if err != nil {
+	if err := msg.Sign(chainIDEpoch, privkey.ToECDSA()); err != nil {
 		return nil, err
 	}
 

client/config.go

@@ -2,15 +2,17 @@ package client
 
 import (
 	"fmt"
-	"math/big"
 	"os"
 	"path"
 
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 
-	"github.com/cosmos/cosmos-sdk/client/flags"
 	"github.com/tendermint/tendermint/libs/cli"
+
+	"github.com/cosmos/cosmos-sdk/client/flags"
+
+	ethermint "github.com/cosmos/ethermint/types"
 )
 
 // InitConfig adds the chain-id, encoding and output flags to the persistent flag set.
@@ -47,12 +49,10 @@ func ValidateChainID(baseCmd *cobra.Command) *cobra.Command {
 
 	// Function to replace command's RunE function
 	validateFn := func(cmd *cobra.Command, args []string) error {
-		chainIDFlag := viper.GetString(flags.FlagChainID)
+		chainID := viper.GetString(flags.FlagChainID)
 
-		// Verify that the chain-id entered is a base 10 integer
-		_, ok := new(big.Int).SetString(chainIDFlag, 10)
-		if !ok {
-			return fmt.Errorf("invalid chainID: %s, must be base-10 integer format", chainIDFlag)
+		if !ethermint.IsValidChainID(chainID) {
+			return fmt.Errorf("invalid chain-id format: %s", chainID)
 		}
 
 		return baseRunE(cmd, args)

client/testnet.go

@@ -37,7 +37,7 @@ import (
 	stakingtypes "github.com/cosmos/cosmos-sdk/x/staking/types"
 
 	"github.com/cosmos/ethermint/crypto"
-	"github.com/cosmos/ethermint/types"
+	ethermint "github.com/cosmos/ethermint/types"
 	evmtypes "github.com/cosmos/ethermint/x/evm/types"
 )
 
@@ -96,8 +96,8 @@ Note, strict routability for addresses is turned off in the config file.`,
 	cmd.Flags().String(flagNodeCLIHome, "ethermintcli", "Home directory of the node's cli configuration")
 	cmd.Flags().String(flagStartingIPAddress, "192.168.0.1", "Starting IP address (192.168.0.1 results in persistent peers list ID0@192.168.0.1:46656, ID1@192.168.0.2:46656, ...)")
 	cmd.Flags().String(flags.FlagChainID, "", "genesis file chain-id, if left blank will be randomly created")
-	cmd.Flags().String(flagCoinDenom, types.AttoPhoton, "Coin denomination used for staking, governance, mint, crisis and evm parameters")
-	cmd.Flags().String(server.FlagMinGasPrices, fmt.Sprintf("0.000006%s", types.AttoPhoton), "Minimum gas prices to accept for transactions; All fees in a tx must meet this minimum (e.g. 0.01aphoton,0.001stake)")
+	cmd.Flags().String(flagCoinDenom, ethermint.AttoPhoton, "Coin denomination used for staking, governance, mint, crisis and evm parameters")
+	cmd.Flags().String(server.FlagMinGasPrices, fmt.Sprintf("0.000006%s", ethermint.AttoPhoton), "Minimum gas prices to accept for transactions; All fees in a tx must meet this minimum (e.g. 0.01aphoton,0.001stake)")
 	cmd.Flags().String(flags.FlagKeyringBackend, flags.DefaultKeyringBackend, "Select keyring's backend (os|file|test)")
 	cmd.Flags().String(flagKeyAlgo, string(crypto.EthSecp256k1), "Key signing algorithm to generate keys for")
 	return cmd
@@ -124,7 +124,11 @@ func InitTestnet(
 ) error {
 
 	if chainID == "" {
-		chainID = fmt.Sprintf("%d", tmrand.Int63())
+		chainID = fmt.Sprintf("ethermint-%d", tmrand.Int63n(9999999999999)+1)
+	}
+
+	if !ethermint.IsValidChainID(chainID) {
+		return fmt.Errorf("invalid chain-id: %s", chainID)
 	}
 
 	if err := sdk.ValidateDenom(coinDenom); err != nil {
@@ -219,7 +223,7 @@ func InitTestnet(
 			sdk.NewCoin(coinDenom, accStakingTokens),
 		)
 
-		genAccounts = append(genAccounts, types.EthAccount{
+		genAccounts = append(genAccounts, ethermint.EthAccount{
 			BaseAccount: authtypes.NewBaseAccount(addr, coins, nil, 0, 0),
 			CodeHash:    ethcrypto.Keccak256(nil),
 		})

cmd/ethermintcli/main.go

@@ -66,7 +66,9 @@ func main() {
 		sdkclient.ConfigCmd(app.DefaultCLIHome),
 		queryCmd(cdc),
 		txCmd(cdc),
+		client.ValidateChainID(
 			rpc.EmintServeCmd(cdc),
+		),
 		flags.LineBreak,
 		client.KeyCommands(),
 		flags.LineBreak,

docs/quickstart/testnet.md

@@ -22,7 +22,7 @@ This guide helps you create a single validator node that runs a network locally
 ```bash
 $MONIKER=testing
 $KEY=mykey
-$CHAINID=8
+$CHAINID="ethermint-1"
 
 ethermintd init $MONIKER --chain-id=$CHAINID
 ```

init.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 KEY="mykey"
-CHAINID=8
+CHAINID="ethermint-1"
 MONIKER="localtestnet"
 
 # remove existing daemon and client

rpc/eth_api.go

@@ -6,14 +6,13 @@ import (
 	"fmt"
 	"math/big"
 	"os"
-	"strconv"
 	"sync"
 
 	"github.com/spf13/viper"
 
 	"github.com/cosmos/ethermint/crypto"
 	params "github.com/cosmos/ethermint/rpc/args"
-	emint "github.com/cosmos/ethermint/types"
+	ethermint "github.com/cosmos/ethermint/types"
 	"github.com/cosmos/ethermint/utils"
 	"github.com/cosmos/ethermint/version"
 	evmtypes "github.com/cosmos/ethermint/x/evm/types"
@@ -44,6 +43,7 @@ import (
 // PublicEthAPI is the eth_ prefixed set of APIs in the Web3 JSON-RPC spec.
 type PublicEthAPI struct {
 	cliCtx       context.CLIContext
+	chainIDEpoch *big.Int
 	logger       log.Logger
 	backend      Backend
 	keys         []crypto.PrivKeySecp256k1
@@ -55,15 +55,21 @@ type PublicEthAPI struct {
 func NewPublicEthAPI(cliCtx context.CLIContext, backend Backend, nonceLock *AddrLocker,
 	key []crypto.PrivKeySecp256k1) *PublicEthAPI {
 
+	epoch, err := ethermint.ParseChainID(cliCtx.ChainID)
+	if err != nil {
+		panic(err)
+	}
+
 	api := &PublicEthAPI{
 		cliCtx:       cliCtx,
+		chainIDEpoch: epoch,
 		logger:       log.NewTMLogger(log.NewSyncWriter(os.Stdout)).With("module", "json-rpc"),
 		backend:      backend,
 		keys:         key,
 		nonceLock:    nonceLock,
 	}
-	err := api.getKeybaseInfo()
-	if err != nil {
+
+	if err := api.getKeybaseInfo(); err != nil {
 		api.logger.Error("failed to get keybase info", "error", err)
 	}
 
@@ -101,14 +107,7 @@ func (e *PublicEthAPI) ProtocolVersion() hexutil.Uint {
 // ChainId returns the chain's identifier in hex format
 func (e *PublicEthAPI) ChainId() (hexutil.Uint, error) { // nolint
 	e.logger.Debug("eth_chainId")
-
-	// parse the chainID from a integer string
-	intChainID, err := strconv.ParseUint(e.cliCtx.ChainID, 0, 64)
-	if err != nil {
-		return 0, fmt.Errorf("invalid chainID: %s, must be integer format", e.cliCtx.ChainID)
-	}
-
-	return hexutil.Uint(intChainID), nil
+	return hexutil.Uint(uint(e.chainIDEpoch.Uint64())), nil
 }
 
 // Syncing returns whether or not the current node is syncing with other peers. Returns false if not, or a struct
@@ -404,13 +403,13 @@ func (e *PublicEthAPI) SendTransaction(args params.SendTxArgs) (common.Hash, err
 	// ChainID must be set as flag to send transaction
 	chainID := viper.GetString(flags.FlagChainID)
 	// parse the chainID from a string to a base-10 integer
-	intChainID, ok := new(big.Int).SetString(chainID, 10)
-	if !ok {
-		return common.Hash{}, fmt.Errorf("invalid chainID: %s, must be integer format", chainID)
+	chainIDEpoch, err := ethermint.ParseChainID(chainID)
+	if err != nil {
+		return common.Hash{}, err
 	}
 
 	// Sign transaction
-	if err := tx.Sign(intChainID, key.ToECDSA()); err != nil {
+	if err := tx.Sign(chainIDEpoch, key.ToECDSA()); err != nil {
 		e.logger.Debug("failed to sign tx", "error", err)
 		return common.Hash{}, err
 	}
@@ -475,7 +474,7 @@ type CallArgs struct {
 // Call performs a raw contract call.
 func (e *PublicEthAPI) Call(args CallArgs, blockNr BlockNumber, _ *map[common.Address]account) (hexutil.Bytes, error) {
 	e.logger.Debug("eth_call", "args", args, "block number", blockNr)
-	simRes, err := e.doCall(args, blockNr, big.NewInt(emint.DefaultRPCGasLimit))
+	simRes, err := e.doCall(args, blockNr, big.NewInt(ethermint.DefaultRPCGasLimit))
 	if err != nil {
 		return []byte{}, err
 	}
@@ -528,7 +527,7 @@ func (e *PublicEthAPI) doCall(
 
 	// Set default gas & gas price if none were set
 	// Change this to uint64(math.MaxUint64 / 2) if gas cap can be configured
-	gas := uint64(emint.DefaultRPCGasLimit)
+	gas := uint64(ethermint.DefaultRPCGasLimit)
 	if args.Gas != nil {
 		gas = uint64(*args.Gas)
 	}
@@ -538,7 +537,7 @@ func (e *PublicEthAPI) doCall(
 	}
 
 	// Set gas price using default or parameter if passed in
-	gasPrice := new(big.Int).SetUint64(emint.DefaultGasPrice)
+	gasPrice := new(big.Int).SetUint64(ethermint.DefaultGasPrice)
 	if args.GasPrice != nil {
 		gasPrice = args.GasPrice.ToInt()
 	}
@@ -565,6 +564,10 @@ func (e *PublicEthAPI) doCall(
 	msg := evmtypes.NewMsgEthermint(0, &toAddr, sdk.NewIntFromBigInt(value), gas,
 		sdk.NewIntFromBigInt(gasPrice), data, sdk.AccAddress(addr.Bytes()))
 
+	if err := msg.ValidateBasic(); err != nil {
+		return nil, err
+	}
+
 	// Generate tx to be used to simulate (signature isn't needed)
 	var stdSig authtypes.StdSignature
 	tx := authtypes.NewStdTx([]sdk.Msg{msg}, authtypes.StdFee{}, []authtypes.StdSignature{stdSig}, "")
@@ -594,7 +597,7 @@ func (e *PublicEthAPI) doCall(
 // param from the SDK.
 func (e *PublicEthAPI) EstimateGas(args CallArgs) (hexutil.Uint64, error) {
 	e.logger.Debug("eth_estimateGas", "args", args)
-	simResponse, err := e.doCall(args, 0, big.NewInt(emint.DefaultRPCGasLimit))
+	simResponse, err := e.doCall(args, 0, big.NewInt(ethermint.DefaultRPCGasLimit))
 	if err != nil {
 		return 0, err
 	}
@@ -1000,7 +1003,7 @@ func (e *PublicEthAPI) generateFromArgs(args params.SendTxArgs) (*evmtypes.MsgEt
 
 		// Set default gas price
 		// TODO: Change to min gas price from context once available through server/daemon
-		gasPrice = big.NewInt(emint.DefaultGasPrice)
+		gasPrice = big.NewInt(ethermint.DefaultGasPrice)
 	}
 
 	if args.Nonce == nil {

rpc/net_api.go

@@ -2,12 +2,12 @@ package rpc
 
 import (
 	"fmt"
-	"strconv"
 
 	"github.com/spf13/viper"
 
 	"github.com/cosmos/cosmos-sdk/client/context"
 	"github.com/cosmos/cosmos-sdk/client/flags"
+	ethermint "github.com/cosmos/ethermint/types"
 )
 
 // PublicNetAPI is the eth_ prefixed set of APIs in the Web3 JSON-RPC spec.
@@ -19,13 +19,13 @@ type PublicNetAPI struct {
 func NewPublicNetAPI(_ context.CLIContext) *PublicNetAPI {
 	chainID := viper.GetString(flags.FlagChainID)
 	// parse the chainID from a integer string
-	intChainID, err := strconv.ParseUint(chainID, 0, 64)
+	chainIDEpoch, err := ethermint.ParseChainID(chainID)
 	if err != nil {
-		panic(fmt.Sprintf("invalid chainID: %s, must be integer format", chainID))
+		panic(err)
 	}
 
 	return &PublicNetAPI{
-		networkVersion: intChainID,
+		networkVersion: chainIDEpoch.Uint64(),
 	}
 }
 

scripts/contract-test.sh

@@ -2,7 +2,7 @@
 
 KEY="mykey"
 TESTKEY="test"
-CHAINID=123321
+CHAINID="ethermint-100"
 MONIKER="localtestnet"
 
 # stop and remove existing daemon and client data and process(es)

scripts/integration-test-all.sh

@@ -15,7 +15,7 @@ IP_ADDR="0.0.0.0"
 MODE="rpc"
 
 KEY="mykey"
-CHAINID=8
+CHAINID="ethermint-2"
 MONIKER="mymoniker"
 
 ## default port prefixes for ethermintd

scripts/run-solidity-tests.sh

@@ -8,6 +8,8 @@ mkdir $GOPATH/bin
 cp ./build/ethermintd $GOPATH/bin
 cp ./build/ethermintcli $GOPATH/bin
 
+CHAINID="ethermint-1337"
+
 cd tests-solidity
 
 if command -v yarn &> /dev/null; then
@@ -22,7 +24,7 @@ fi
 chmod +x ./init-test-node.sh
 ./init-test-node.sh > ethermintd.log &
 sleep 5
-ethermintcli rest-server --laddr "tcp://localhost:8545" --unlock-key localkey,user1,user2 --chain-id 1337 --trace --wsport 8546 > ethermintcli.log &
+ethermintcli rest-server --laddr "tcp://localhost:8545" --unlock-key localkey,user1,user2 --chain-id $CHAINID --trace --wsport 8546 > ethermintcli.log &
 
 cd suites/initializable
 yarn test-ethermint
@@ -43,7 +45,7 @@ exit $ok
 
 ./../../init-test-node.sh > ethermintd.log &
 sleep 5
-ethermintcli rest-server --laddr "tcp://localhost:8545" --unlock-key localkey,user1,user2 --chain-id 1337 --trace --wsport 8546 > ethermintcli.log &
+ethermintcli rest-server --laddr "tcp://localhost:8545" --unlock-key localkey,user1,user2 --chain-id $CHAINID --trace --wsport 8546 > ethermintcli.log &
 
 cd ../initializable-buidler
 yarn test-ethermint

scripts/start.sh

@@ -1,5 +1,5 @@
 #!/bin/sh
 ethermintd --home /ethermint/node$ID/ethermintd/ start > ethermintd.log &
 sleep 5
-ethermintcli rest-server --laddr "tcp://localhost:8545" --chain-id 7305661614933169792 --trace > ethermintcli.log &
+ethermintcli rest-server --laddr "tcp://localhost:8545" --chain-id "ethermint-7305661614933169792" --trace > ethermintcli.log &
 tail -f /dev/null

tests-solidity/README.md

@@ -25,7 +25,7 @@ In the first, run `ethermintd`:
 In the second, run `ethermintcli` as mentioned in the script's output:
 
 ```sh
-ethermintcli rest-server --laddr "tcp://localhost:8545" --unlock-key localkey,user1,user2 --chain-id 1337 --trace --wsport 8546
+ethermintcli rest-server --laddr "tcp://localhost:8545" --unlock-key localkey,user1,user2 --chain-id "ethermint-1337" --trace --wsport 8546
 ```
 
 You will now have three ethereum accounts unlocked in the test node:
@@ -83,7 +83,7 @@ Running `ethermintcli list keys` should output:
 
 And running:
 
-```
+```sh
 curl localhost:8545 -H "Content-Type:application/json" -X POST --data '{"jsonrpc":"2.0","method":"eth_accounts","params":[],"id":1}'
 ```
 

tests-solidity/init-test-node.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-CHAINID=1337
+CHAINID="ethermint-1337"
 MONIKER="localtestnet"
 
 VAL_KEY="localkey"

types/chain_id.go

@@ -0,0 +1,48 @@
+package types
+
+import (
+	"fmt"
+	"math/big"
+	"regexp"
+	"strings"
+
+	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
+)
+
+var (
+	regexChainID     = `[a-z]*`
+	regexSeparator   = `-{1}`
+	regexEpoch       = `[1-9][0-9]*`
+	ethermintChainID = regexp.MustCompile(fmt.Sprintf(`^(%s)%s(%s)$`, regexChainID, regexSeparator, regexEpoch))
+)
+
+// IsValidChainID returns false if the given chain identifier is incorrectly formatted.
+func IsValidChainID(chainID string) bool {
+	if len(chainID) > 48 {
+		return false
+	}
+
+	return ethermintChainID.MatchString(chainID)
+}
+
+// ParseChainID parses a string chain identifier's epoch to an Ethereum-compatible
+// chain-id in *big.Int format. The function returns an error if the chain-id has an invalid format
+func ParseChainID(chainID string) (*big.Int, error) {
+	chainID = strings.TrimSpace(chainID)
+	if len(chainID) > 48 {
+		return nil, sdkerrors.Wrapf(ErrInvalidChainID, "chain-id '%s' cannot exceed 48 chars", chainID)
+	}
+
+	matches := ethermintChainID.FindStringSubmatch(chainID)
+	if matches == nil || len(matches) != 3 || matches[1] == "" {
+		return nil, sdkerrors.Wrap(ErrInvalidChainID, chainID)
+	}
+
+	// verify that the chain-id entered is a base 10 integer
+	chainIDInt, ok := new(big.Int).SetString(matches[2], 10)
+	if !ok {
+		return nil, sdkerrors.Wrapf(ErrInvalidChainID, "epoch %s must be base-10 integer format", matches[2])
+	}
+
+	return chainIDInt, nil
+}

types/chain_id_test.go

@@ -0,0 +1,75 @@
+package types
+
+import (
+	"math/big"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestParseChainID(t *testing.T) {
+	testCases := []struct {
+		name     string
+		chainID  string
+		expError bool
+		expInt   *big.Int
+	}{
+		{
+			"valid chain-id, single digit", "ethermint-1", false, big.NewInt(1),
+		},
+		{
+			"valid chain-id, multiple digits", "aragonchain-256", false, big.NewInt(256),
+		},
+		{
+			"invalid chain-id, double dash", "aragon-chain-1", true, nil,
+		},
+		{
+			"invalid chain-id, dash only", "-", true, nil,
+		},
+		{
+			"invalid chain-id, undefined", "-1", true, nil,
+		},
+		{
+			"invalid chain-id, uppercases", "ETHERMINT-1", true, nil,
+		},
+		{
+			"invalid chain-id, mixed cases", "Ethermint-1", true, nil,
+		},
+		{
+			"invalid chain-id, special chars", "$&*#!-1", true, nil,
+		},
+		{
+			"invalid epoch, cannot start with 0", "ethermint-001", true, nil,
+		},
+		{
+			"invalid epoch, cannot invalid base", "ethermint-0x212", true, nil,
+		},
+		{
+			"invalid epoch, non-integer", "ethermint-ethermint", true, nil,
+		},
+		{
+			"invalid epoch, undefined", "ethermint-", true, nil,
+		},
+		{
+			"blank chain ID", " ", true, nil,
+		},
+		{
+			"empty chain ID", "", true, nil,
+		},
+		{
+			"long chain-id", "ethermint-" + strings.Repeat("1", 40), true, nil,
+		},
+	}
+
+	for _, tc := range testCases {
+		chainIDEpoch, err := ParseChainID(tc.chainID)
+		if tc.expError {
+			require.Error(t, err, tc.name)
+			require.Nil(t, chainIDEpoch)
+		} else {
+			require.NoError(t, err, tc.name)
+			require.Equal(t, tc.expInt, chainIDEpoch, tc.name)
+		}
+	}
+}

x/evm/handler.go

@@ -1,11 +1,9 @@
 package evm
 
 import (
-	"math/big"
-
 	"github.com/ethereum/go-ethereum/common"
 
-	emint "github.com/cosmos/ethermint/types"
+	ethermint "github.com/cosmos/ethermint/types"
 	"github.com/cosmos/ethermint/x/evm/types"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
@@ -32,13 +30,13 @@ func NewHandler(k Keeper) sdk.Handler {
 // handleMsgEthereumTx handles an Ethereum specific tx
 func handleMsgEthereumTx(ctx sdk.Context, k Keeper, msg types.MsgEthereumTx) (*sdk.Result, error) {
 	// parse the chainID from a string to a base-10 integer
-	intChainID, ok := new(big.Int).SetString(ctx.ChainID(), 10)
-	if !ok {
-		return nil, sdkerrors.Wrap(emint.ErrInvalidChainID, ctx.ChainID())
+	chainIDEpoch, err := ethermint.ParseChainID(ctx.ChainID())
+	if err != nil {
+		return nil, err
 	}
 
 	// Verify signature and retrieve sender address
-	sender, err := msg.VerifySig(intChainID)
+	sender, err := msg.VerifySig(chainIDEpoch)
 	if err != nil {
 		return nil, err
 	}
@@ -54,7 +52,7 @@ func handleMsgEthereumTx(ctx sdk.Context, k Keeper, msg types.MsgEthereumTx) (*s
 		Amount:       msg.Data.Amount,
 		Payload:      msg.Data.Payload,
 		Csdb:         k.CommitStateDB.WithContext(ctx),
-		ChainID:      intChainID,
+		ChainID:      chainIDEpoch,
 		TxHash:       &ethHash,
 		Sender:       sender,
 		Simulate:     ctx.IsCheckTx(),
@@ -123,9 +121,9 @@ func handleMsgEthereumTx(ctx sdk.Context, k Keeper, msg types.MsgEthereumTx) (*s
 // handleMsgEthermint handles an sdk.StdTx for an Ethereum state transition
 func handleMsgEthermint(ctx sdk.Context, k Keeper, msg types.MsgEthermint) (*sdk.Result, error) {
 	// parse the chainID from a string to a base-10 integer
-	intChainID, ok := new(big.Int).SetString(ctx.ChainID(), 10)
-	if !ok {
-		return nil, sdkerrors.Wrap(emint.ErrInvalidChainID, ctx.ChainID())
+	chainIDEpoch, err := ethermint.ParseChainID(ctx.ChainID())
+	if err != nil {
+		return nil, err
 	}
 
 	txHash := tmtypes.Tx(ctx.TxBytes()).Hash()
@@ -138,7 +136,7 @@ func handleMsgEthermint(ctx sdk.Context, k Keeper, msg types.MsgEthermint) (*sdk
 		Amount:       msg.Amount.BigInt(),
 		Payload:      msg.Payload,
 		Csdb:         k.CommitStateDB.WithContext(ctx),
-		ChainID:      intChainID,
+		ChainID:      chainIDEpoch,
 		TxHash:       &ethHash,
 		Sender:       common.BytesToAddress(msg.From.Bytes()),
 		Simulate:     ctx.IsCheckTx(),

x/evm/handler_test.go

@@ -21,6 +21,7 @@ import (
 
 	"github.com/cosmos/ethermint/app"
 	"github.com/cosmos/ethermint/crypto"
+	ethermint "github.com/cosmos/ethermint/types"
 	"github.com/cosmos/ethermint/x/evm"
 	"github.com/cosmos/ethermint/x/evm/keeper"
 	"github.com/cosmos/ethermint/x/evm/types"
@@ -43,7 +44,7 @@ func (suite *EvmTestSuite) SetupTest() {
 	checkTx := false
 
 	suite.app = app.Setup(checkTx)
-	suite.ctx = suite.app.BaseApp.NewContext(checkTx, abci.Header{Height: 1, ChainID: "3", Time: time.Now().UTC()})
+	suite.ctx = suite.app.BaseApp.NewContext(checkTx, abci.Header{Height: 1, ChainID: "ethermint-3", Time: time.Now().UTC()})
 	suite.handler = evm.NewHandler(suite.app.EvmKeeper)
 	suite.querier = keeper.NewQuerier(suite.app.EvmKeeper)
 	suite.codec = codec.New()
@@ -58,10 +59,7 @@ func (suite *EvmTestSuite) TestHandleMsgEthereumTx() {
 	suite.Require().NoError(err)
 	sender := ethcmn.HexToAddress(privkey.PubKey().Address().String())
 
-	var (
-		tx      types.MsgEthereumTx
-		chainID *big.Int
-	)
+	var tx types.MsgEthereumTx
 
 	testCases := []struct {
 		msg      string
@@ -75,9 +73,8 @@ func (suite *EvmTestSuite) TestHandleMsgEthereumTx() {
 				tx = types.NewMsgEthereumTx(0, &sender, big.NewInt(100), 0, big.NewInt(10000), nil)
 
 				// parse context chain ID to big.Int
-				var ok bool
-				chainID, ok = new(big.Int).SetString(suite.ctx.ChainID(), 10)
-				suite.Require().True(ok)
+				chainID, err := ethermint.ParseChainID(suite.ctx.ChainID())
+				suite.Require().NoError(err)
 
 				// sign transaction
 				err = tx.Sign(chainID, privkey.ToECDSA())
@@ -91,9 +88,8 @@ func (suite *EvmTestSuite) TestHandleMsgEthereumTx() {
 				tx = types.NewMsgEthereumTxContract(0, big.NewInt(100), 0, big.NewInt(10000), nil)
 
 				// parse context chain ID to big.Int
-				var ok bool
-				chainID, ok = new(big.Int).SetString(suite.ctx.ChainID(), 10)
-				suite.Require().True(ok)
+				chainID, err := ethermint.ParseChainID(suite.ctx.ChainID())
+				suite.Require().NoError(err)
 
 				// sign transaction
 				err = tx.Sign(chainID, privkey.ToECDSA())
@@ -125,7 +121,7 @@ func (suite *EvmTestSuite) TestHandleMsgEthereumTx() {
 	}
 
 	for _, tc := range testCases {
-		suite.Run("", func() {
+		suite.Run(tc.msg, func() {
 			suite.SetupTest() // reset
 			//nolint
 			tc.malleate()