Bank#

Important

Terra’s bank module inherits from the Cosmos SDK’s bank module. This document is a stub and covers mainly important Terra-specific notes about how it is used.

The bank module is the base transactional layer of the Terra blockchain. This module allows assets to be sent from one Account to another. The bank module defines the following types of send transactions: MsgSend and MsgMultiSend.

Message types#

MsgSend#

MsgSend transfers funds from a source account to a destination account.

// MsgSend - high level transaction of the coin module
type MsgSend struct {
    FromAddress sdk.AccAddress `json:"from_address"`
    ToAddress   sdk.AccAddress `json:"to_address"`
    Amount      sdk.Coins      `json:"amount"`
}

The Bank module is used to send coins from one Terra account to another. MsgSend is constructed to facilitate the transfer. If the balance of coins in the sender Account is insufficient or the recipient Account is unable to receive the funds via the bank module, the transaction fails. Fees already paid through failed transactions are not refunded.

MsgMultiSend#

// MsgMultiSend - high level transaction of the coin module
type Input struct {
  Address sdk.AccAddress `json:"address" yaml:"address"`
  Coins   sdk.Coins      `json:"coins" yaml:"coins"`
}

type Output struct {
  Address sdk.AccAddress `json:"address" yaml:"address"`
  Coins   sdk.Coins      `json:"coins" yaml:"coins"`
}

type MsgMultiSend struct {
  Inputs  []Input  `json:"inputs" yaml:"inputs"`
  Outputs []Output `json:"outputs" yaml:"outputs"`
}

To send multiple transactions at once, use MsgMultiSend. For each transaction, Inputs contains the incoming transactions, and Outputs contains the outgoing transactions. The Inputs coin balance must exactly match the Outputs coin balance. Batching transactions via MsgMultiSend conserves gas fees and network bandwidth. Fees already paid through failed transactions are not refunded.

Parameters#

The genesis parameters outlined in the Genesis Builder Script are as follows:

    # Bank: setup supply
    genesis['app_state']['bank']['supply'] = [{
        'denom': DENOM_LUNA,
        'amount': str(TOTAL_ALLOCATION),
    }]

    # Bank: set denom meta
    genesis['app_state']['bank']['denom_metadata'] = [{
        'description': 'The native staking token of Terra 2.0',
        'denom_units': [
            {'denom': 'uluna', 'exponent': 0, 'aliases': ['microluna']},
            {'denom': 'mluna', 'exponent': 3, 'aliases': ['milliluna']},
            {'denom': 'luna', 'exponent': 6, 'aliases': []},
        ],
        'base':    'uluna',
        'display': 'luna',
        'name':    'LUNA',
        'symbol':  'LUNA',
    }]

    ```

Bank

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