ICON Developer Portal

ICON Developer Portal

ICON Network is a decentralized smart contract protocol based on ‘loopchain’, a high-performance blockchain engine. The ICON Network aims to remove barriers among different blockchains and allow them to exchange values without intermediaries. By realizing this goal, ICON will realize the mass adoption of blockchain technology and Hyperconnect the World.

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tbears genconf command will generate the default configuration files and a test keystore file.
If the configurations files do not exist, T-Bears follows the default config values which are presented below. If the default config files (tbears_server_config.json or tbears_cli_config.json) exist in the same folder where tbears is executed, tbears loads the values from the file. You can override the default behavior by updating the values in the config file or specifying a custom config file path with -c option. For the details of T-Bears commands, please read CLI Commands.


When starting T-Bears (tbears start), "tbears_server_config.json" is used to configure the parameters and initial settings of the T-Bears Server.
In this configuration file, for example, you can configure log file path, turn on/off transaction fees, and add another test account with initial ICX balance.

// tbears_server_config.json
    "hostAddress": "",
    "port": 9000,
    "scoreRootPath": "./.score",
    "stateDbRootPath": "./.statedb",
    "log": {
        "logger": "tbears",
        "level": "info",
        "filePath": "./tbears.log",
        "colorLog": true,
        "outputType": "file",
        "rotate": {
            "type": "bytes",
            "maxBytes": 10485760,
            "backupCount": 10
    "service": {
        "fee": false,
        "audit": false,
        "deployerWhiteList": false
    "genesis": {
        "nid": "0x3",
        "accounts": [
                "name": "genesis",
                "address": "hx0000000000000000000000000000000000000000",
                "balance": "0x2961fff8ca4a62327800000"
                "name": "fee_treasury",
                "address": "hx1000000000000000000000000000000000000000",
                "balance": "0x0"
                "name": "test1",
                "address": "hxe7af5fcfd8dfc67530a01a0e403882687528dfcb",
                "balance": "0x2961fff8ca4a62327800000"
    "blockConfirmInterval": 10,
    "blockConfirmEmpty": true
FieldData typeDescription
hostAddressstringIP address that T-Bears service will listen on.
portintPort number that T-Bears service will listen on.
scoreRootPathstringRoot directory where SCORE will be installed.
stateDbRootPathstringRoot directory where state DB file will be created.
logdictT-Bears log setting
log.loggerstringMain logger in process
log.levelstringlog level.
"debug", "info", "warning", "error"
log.filePathstringLog file path.
log.colorLogbooleanLog display option (color or black)
log.outputTypestring“console”: log outputs to the console that T-Bears is running.
“file”: log outputs to the file path.
“console|file”: log outputs to both console and file.
log.rotatedictLog rotate setting
log.rotate.typestring"period": rotate by period.
"bytes": rotate by maxBytes.
"period|bytes": log rotate to both period and bytes.
log.rotate.periodstringuse logging.TimedRotatingFileHandler 'when'
ex) daily, weekly, hourly or minutely
log.rotate.intervalstringuse logging.TimedRotatingFileHandler 'interval'
ex) (period: hourly, interval: 24) == (period: daily, interval: 1)
log.rotate.maxBytesintegeruse logging.RotatingFileHandler 'maxBytes'
ex) 10mb == 10 1024 1024
log.rotate.backupCountintegerlimit log file count
servicedictT-Bears service setting
service.feebooleantrue | false. Charge a fee per transaction when enabled
service.auditbooleantrue | false. Audit deploy transactions when enabled
service.deployerWhiteListbooleantrue | false. Limit SCORE deploy permission when enabled
genesisdictGenesis information of T-Bears node.
genesis.nidstringNetwork ID.
genesis.accountslistList of accounts that holds initial coins.
(index 0) genesis: account that holds initial coins.
(index 1) fee_treasury: account that collects transaction fees.
(index 2~): test accounts that you can add.
channelstringchannel name interact with iconrpcserver and iconservice
amqpKeystringamqp key name interact with iconrpcserver and iconservice
amqpTargetstringamqp target name interact with iconrpcserver and iconservice
blockConfirmIntervalintegerConfirm block every N seconds
blockConfirmEmptybooleantrue | false. Confirm empty block when enabled


For every T-Bears SCORE & Other CLI Commands except init and test, this file is used to configure the default parameters and initial settings.

In this configuration file, you can define default option values for some CLI commands. For example, SCORE's on_install() or on_update() method is called on deployment. In this config file, you can set the deploy "mode" and the parameters ("scoreParams") of on_install() or on_update() as shown in the following example.

// tbears_cli_config.json
    "uri": "",
    "nid": "0x3",
    "keyStore": null,
    "from": "hxe7af5fcfd8dfc67530a01a0e403882687528dfcb",
    "to": "cx0000000000000000000000000000000000000000",
    "deploy": {
        "mode": "install",
        "scoreParams": {}
    "txresult": {},
    "transfer": {}
FieldData typeDescription
uristringURI to send the request.
nidstringNetwork ID. 0x3 is reserved for T-Bears.
keyStorestringKeystore file path.
fromstringFrom address. It is ignored if 'keyStore' is set.
tostringTo address.
stepLimitstring(optional) stepLimit value.
deploydictOptions for deploy command.
deploy.modestringDeploy mode.
install: new SCORE deployment.
update: update the SCORE that was previously deployed.
deploy.scoreParamsdictParameters to be passed to on_install() or on_update()
deploy.fromstringAddress of the SCORE deployer
Optional. This value will override "from" value. If not given, "from" value will be used.
deploy.tostringUsed when update SCORE (The address of the SCORE being updated).
In the case of "install" mode, the address should be 'cx0000~'.
Optional. This value will override "to" value. If not given, "to" value will be used.
txresultdictOptions for txresult command.
You can define command options in a dict.
transferdictOptions for transfer command.
You can define command options in a dict.

Following CLI commands and options can be defined in the configuration file.

deployuri, nid, keyStore, from, to, mode, scoreParams, stepLimit
transferuri, nid, keyStore, from, stepLimit
sendtxuri, nid, keyStore, from, stepLimit


Keystore file for a test account. The password of this keystore file is test1_Account.
You will find the test account test1 in tbears_server_config.json and see the account has enough ICX balance (0x2961fff8ca4a62327800000) to test.

Do not transfer any ICX or tokens to 'test1' account.

// keystore_test1
    "address": "hxe7af5fcfd8dfc67530a01a0e403882687528dfcb",
    "crypto": {
        "cipher": "aes-128-ctr",
        "cipherparams": {
            "iv": "dc0762c56ca56cd06038df5051c9e23e"
        "ciphertext": "7cc40efac0b14eaf56f951c9c9620f9f34bac548175e85052aa9f753423dc984",
        "kdf": "scrypt",
        "kdfparams": {
            "dklen": 32,
            "n": 16384,
            "r": 1,
            "p": 8,
            "salt": "380c00457be5fd1c244f5745c322b21f"
        "mac": "157dda6fb7092df62ff93411bed54e5a64dbf06c1aae3b375d356061a9c3dfd1"
    "id": "e2ca66c6-b8de-4413-82cb-52c2a2200b8d",
    "version": 3,
    "coinType": "icx"



This project follows the Apache 2.0 License. Please refer to LICENSE for details.

Updated about a year ago


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