---
title: Multiple Indy Network Support

---

# ArgParse Config

* `--genesis-transactions-list`
Load YAML configuration for connecting to multiple HyperLedger Indy ledgers
* YAML config file

- id: sovrinMain
  is_production: true
  genesis_transactions:
    reqSignature: {}
    txn:
      data:
        data:
          alias: Node1
          blskey: >-
            4N8aUNHSgjQVgkpm8nhNEfDf6txHznoYREg9kirmJrkivgL4oSEimFF6nsQ6M41QvhM2Z33nves5vfSn9n1UwNFJBYtWVnHYMATn76vLuL3zU88KyeAYcHfsih3He6UHcXDxcaecHVz6jhCYz1P2UZn2bDVruL5wXpehgBfBaLKm3Ba
          blskey_pop: >-
            RahHYiCvoNCtPTrVtP7nMC5eTYrsUA8WjXbdhNc8debh1agE9bGiJxWBXYNFbnJXoXhWFMvyqhqhRoq737YQemH5ik9oL7R4NTTCz2LEZhkgLJzB3QRQqJyBNyv7acbdHrAT8nQ9UkLbaVL9NBpnWXBTw4LEMePaSHEw66RzPNdAX1
          client_ip: 192.168.65.3
          client_port: 9702
          node_ip: 192.168.65.3
          node_port: 9701
          services:
            - VALIDATOR
        dest: Gw6pDLhcBcoQesN72qfotTgFa7cbuqZpkX3Xo6pLhPhv
      metadata:
        from: Th7MpTaRZVRYnPiabds81Y
      type: '0'
    txnMetadata:
      seqNo: 1
      txnId: fea82e10e894419fe2bea7d96296a6d46f50f93f9eeda954ec461b2ed2950b62
    ver: '1'
- id: sovrinStaging
  is_production: true
  genesis_file: /home/indy/ledger/sandbox/pool_transactions_genesis
- id: sovrinTest
  is_production: false
  genesis_url: 'http://localhost:9000/genesis'

---

# Changes
* If `--genesis-transactions-list` is passed, it loads multiple genesis_transactions and assign it to `settings["ledger.ledger_config_list"]`
It contains a list of configurations like below:

{
    "id": ...,
    "is_production": True,
    "genesis_transactions": ...,
}

* If `ledger.ledger_config_list` is found in `context.settings` then ledger is not confugired in the `profile`. Instead, multiple ledgers are configured and binded with `BaseMultipleLedgerManager` using `MultiLedgerManagerProvider` in `Conductor` and `Provision`.

* `BaseMultipleLedgerManager` is inherited to create `MultiIndyVDRLedgerManager` and `MultiIndySDKLedgerManager`

class BaseMultipleLedgerManager(ABC):
    """Base class for handling multiple ledger support."""

    def __init__(self, profile: Profile):
        """Initialize Multiple Ledger Manager."""
        super().__init__()
        self._profile = profile

    @abstractmethod
    async def get_write_ledger(self) -> T:
        """Return write ledger."""

    @abstractmethod
    async def set_write_ledger(self, ledger_id: str = None) -> T:
        """Set a ledger as write ledger and update BaseLedger."""

    @abstractmethod
    async def update_profile_context(self, ledger: T):
        """Update BaseLedger and Verifier in context."""

    @abstractmethod
    async def reset_write_ledger(self) -> T:
        """Reset the assigned write_ledger and return new write ledger."""

    @abstractmethod
    async def update_ledger_config(self, ledger_config_list: List):
        """Update production and non_production ledgers."""

    @abstractmethod
    async def get_ledger_instance_by_did(self, did: str) -> Optional[T]:
        """Return ledger_instance with DID, if present."""

* Like AFJ, `get_ledger_instance_by_did` is called when executing Read request [CRED_DEF, SCHEMA, ATTRIB(did endpoint), REVOC_REG] by extracting the DID from the IDs. It submits `GET_NYM` from different configured ledgers and returns the applicable/target ledger. This ledger is then used to submit the original GET request.