This example of an .env file for the erc-to-erc bridge mode includes comments describing each parameter.
# The type of bridge. Defines set of contracts to be deployed.
BRIDGE_MODE=ERC_TO_ERC
# The private key hex value of the account responsible for contracts
# deployments and initial configuration. The account's balance must contain
# funds from both networks.
DEPLOYMENT_ACCOUNT_PRIVATE_KEY=67..14
# The "gas" parameter set in every deployment/configuration transaction.
DEPLOYMENT_GAS_LIMIT=4000000
# The "gasPrice" parameter set in every deployment/configuration transaction on
# Home network (in Wei).
HOME_DEPLOYMENT_GAS_PRICE=10000000000
# The "gasPrice" parameter set in every deployment/configuration transaction on
# Foreign network (in Wei).
FOREIGN_DEPLOYMENT_GAS_PRICE=10000000000
# The timeout limit to wait for receipt of the deployment/configuration
# transaction.
GET_RECEIPT_INTERVAL_IN_MILLISECONDS=3000
# The name of the ERC677 token to be deployed on the Home network.
BRIDGEABLE_TOKEN_NAME=Your New Bridged Token
# The symbol name of the ERC677 token to be deployed on the Home network.
BRIDGEABLE_TOKEN_SYMBOL=TEST
# The number of supportable decimal digits after the "point" in the ERC677 token
# to be deployed on the Home network.
BRIDGEABLE_TOKEN_DECIMALS=18
# The RPC channel to a Home node able to handle deployment/configuration
# transactions.
HOME_RPC_URL=https://poa.infura.io
# Address on Home network with permissions to change parameters of the bridge contract.
# For extra security we recommended using a multi-sig wallet contract address here.
HOME_BRIDGE_OWNER=0x
# Address on Home network with permissions to change parameters of bridge validator contract.
HOME_VALIDATORS_OWNER=0x
# Address on Home network with permissions to upgrade the bridge contract and the bridge validator contract.
HOME_UPGRADEABLE_ADMIN=0x
# The daily transaction limit in Wei. As soon as this limit is exceeded, any
# transaction which requests to relay assets will fail.
HOME_DAILY_LIMIT=30000000000000000000000000
# The maximum limit for one transaction in Wei. If a single transaction tries to
# relay funds exceeding this limit it will fail.
HOME_MAX_AMOUNT_PER_TX=1500000000000000000000000
# The minimum limit for one transaction in Wei. If a transaction tries to relay
# funds below this limit it will fail. This is required to prevent dryout
# validator accounts.
HOME_MIN_AMOUNT_PER_TX=500000000000000000
# The finalization threshold. The number of blocks issued after the block with
# the corresponding deposit transaction to guarantee the transaction will not be
# rolled back.
HOME_REQUIRED_BLOCK_CONFIRMATIONS=1
# The default gas price (in Wei) used to send Home Network signature
# transactions for deposit or withdrawal confirmations. This price is used if
# the Gas price oracle is unreachable.
HOME_GAS_PRICE=1000000000
# Fee percent on the Home side (user will be charged during Foreign to Home).
# User will be charged in tokens. The value has 2 decimal places. e.g. 500 means 5%
HOME_FEE_PERCENT=500
# The RPC channel to a Foreign node able to handle deployment/configuration
# transactions.
FOREIGN_RPC_URL=https://mainnet.infura.io
# Address on Foreign network with permissions to change parameters of the bridge contract.
# For extra security we recommended using a multi-sig wallet contract address here.
FOREIGN_BRIDGE_OWNER=0x
# Address on Foreign network with permissions to change parameters of bridge validator contract.
FOREIGN_VALIDATORS_OWNER=0x
# Address on Foreign network with permissions to upgrade the bridge contract and the bridge validator contract.
FOREIGN_UPGRADEABLE_ADMIN=0x
# These three parameters are not used in this mode, but the deployment script
# requires it to be set to some value.
FOREIGN_DAILY_LIMIT=0
FOREIGN_MAX_AMOUNT_PER_TX=0
FOREIGN_MIN_AMOUNT_PER_TX=0
# The finalization threshold. The number of blocks issued after the block with
# the corresponding deposit transaction to guarantee the transaction will not be
# rolled back.
FOREIGN_REQUIRED_BLOCK_CONFIRMATIONS=8
# The default gas price (in Wei) used to send Foreign network transactions
# finalizing asset deposits. This price is used if the Gas price oracle is
# unreachable.
FOREIGN_GAS_PRICE=10000000000
# The address of the existing ERC20 compatible token in the Foreign network to
# be exchanged to the ERC20/ERC677 token deployed on Home.
ERC20_TOKEN_ADDRESS=0x
# Fee percent on the Foreign side (user will be charged during Home to Foreign).
# User will be charged in tokens. The value has 2 decimal places. e.g. 500 means 5%
FOREIGN_FEE_PERCENT=500
# The minimum number of validators required to send their signatures confirming
# the relay of assets. The same number of validators is expected on both sides
# of the bridge.
REQUIRED_NUMBER_OF_VALIDATORS=1
# The set of validators' addresses. It is assumed that signatures from these
# addresses are collected on the Home side. The same addresses will be used on
# the Foreign network to confirm that the finalized agreement was transferred
# correctly to the Foreign network.
VALIDATORS=0x 0x 0x