Distributed ledger core

1. A method for interacting with a distributed ledger core, comprising:

receiving, at a distributed banking ledger in a blockchain-based distributed ledger system, a transaction request for a transaction involving an off-chain account on an off-chain core banking ledger from a client system for a client via an Application Programming Interface (API), wherein a consensus algorithm operating on a plurality of distributed computer nodes in the blockchain-based distributed ledger system updates the distributed banking ledger in which multiple copies of the distributed banking ledger exist across the plurality of distributed computer nodes;

creating, by a smart contract executed on the distributed banking ledger, a pending transaction for the transaction on the distributed banking ledger;

placing, by the smart contract, a pending notation on the pending transaction;

notifying, by the smart contract, the client system of the pending transaction;

sending, by the smart contract, a posting request for the pending transaction to a ledger interoperability service, wherein the ledger interoperability service facilitates interactions between the distributed banking ledger and the off-chain core banking ledger;

generating, by a posting generation service, accounting movement instructions for the transaction;

posting, by a posting execution service, the accounting movement instructions to the off-chain account on the off-chain core banking ledger and providing posting details to the ledger interoperability service;

validating, by the ledger interoperability service, the posting generation service, and/or the posting execution service, the posting details with a data services module;

receiving, by the smart contract, a posting validation complete notification from the posting execution service via the ledger interoperability service;

settling, by the smart contract, the transaction on the distributed banking ledger by writing the transaction as a new block to the distributed banking ledger;

sending, by the smart contract, a posting complete acknowledgement to the posting execution service via the ledger interoperability service;

generating, by the posting execution service, a transaction request complete posting;

executing, by the posting generation service, the transaction request complete posting and returning a transaction complete posting to the distributed banking ledger via the ledger interoperability service; and

sending, by the smart contract, a completion notification to the client system.

2. The method of claim 1 , wherein the transaction comprises a deposit, a transfer, or a withdrawal.

3. The method of claim 1 , wherein the posting request identifies a plurality of accounts involved in the transaction, a posting/value date, a currency for the transaction, and/or an amount of the transaction.

4. The method of claim 1 , wherein the pending transaction indicates restricts the transaction until the transaction request complete posting is received.

5. The method of claim 1 , wherein the ledger interoperability service, the posting generation service, and/or the posting execution service validates an existence of an account involved in the transaction and/or a balance of the account.

6. The method of claim 1 , wherein the ledger interoperability service, the posting generation service, and/or the posting execution service validates the posting details with a reference data service and/or a structure management service.

7. The method of claim 1 , wherein the step of settling the transaction on the distributed banking ledger comprises crediting or increasing a balance of an on-chain account for the client using an off-chain account as a source for a deposit transaction, or debiting or decreasing the balance of the on-chain account for the client using the off-chain account as a target for a withdrawal transaction.

8. The method of claim 1 , wherein the step of settling the transaction on the distributed banking ledger comprises moving funds from a first on-chain account to a second on-chain account by debiting or decreasing a balance of the first on-chain account and crediting or increasing the balance of the second on-chain account for a transfer transaction.

9. A distributed ledger core system, comprising:

a blockchain-based distributed ledger system comprising:

a distributed banking ledger; and

a plurality of distributed computer nodes, wherein a consensus algorithm operating on the plurality of distributed computer nodes in the blockchain-based distributed ledger system updates the distributed banking ledger in which multiple copies of the distributed banking ledger exist across the plurality of distributed computer nodes;

a client system for a client;

an off-chain core banking ledger comprising an off chain account;

a ledger interoperability service that facilitates interactions between the distributed banking ledger and the off-chain core banking ledger;

a posting generation service;

a posting execution service; and

a data services module;

wherein:

the distributed banking ledger is configured to receive a transaction request for a transaction involving the off-chain account on the off-chain core banking ledger from a client via an Application Programming Interface (API) from the client system;

a smart contract executed on the distributed banking ledger is configured to create a pending transaction for the transaction on the distributed banking ledger;

the smart contract executed on the distributed banking ledger is configured to place a pending notation on the pending transaction;

the smart contract is configured to notify the client system of the pending transaction;

the smart contract is configured to send a posting request for the pending transaction to the ledger interoperability service;

the posting generation service is configured to generate accounting movement instructions for the transaction;

the posting execution service is configured to post the accounting movement instructions and providing posting details to the ledger interoperability service;

the ledger interoperability service, the posting generation service, and/or the posting execution service is configured to validate the posting details with a data services module;

the smart contract is configured to receive a posting validation complete notification from the posting execution service via the ledger interoperability service;

the smart contract is configured to settle the transaction on the distributed banking ledger by writing the transaction as a new block to the distributed banking ledger;

the smart contract is configured to send a posting complete acknowledgement to the posting execution service via the ledger interoperability service;

the posting execution service is configured to generate a transaction request complete posting;

the posting generation service is configured to execute the transaction request complete posting and returning a transaction complete posting to the distributed banking ledger via the ledger interoperability service; and

the smart contract is configured to send a completion notification to the client.

10. The distributed ledger core system of claim 9 , wherein the transaction comprises a deposit, a transfer, or a withdrawal.

11. The distributed ledger core system of claim 9 , wherein the posting request identifies a plurality of accounts involved in the transaction, a posting/value date, a currency for the transaction, and/or an amount of the transaction.

12. The distributed ledger core system of claim 9 , wherein the pending transaction indicates restricts the transaction until the transaction request complete posting is received.

13. The distributed ledger core system of claim 9 , wherein the ledger interoperability service, the posting generation service, and/or the posting execution service validates an existence of an account involved in the transaction and/or a balance of the account.

14. The distributed ledger core system of claim 9 , wherein the ledger interoperability service, the posting generation service, and/or the posting execution service validates the posting details with a reference data service and/or a structure management service.

15. The distributed ledger core system of claim 9 , the smart contract is further configured to settle the transaction on the distributed banking ledger by crediting or increasing a balance of an on-chain account for the client using an off-chain account as a source for a deposit transaction, or debiting or decreasing the balance of the on-chain account for the client using the off-chain account as a target for a withdrawal transaction.

16. The distributed ledger core system of claim 9 , the smart contract is further configured to settle the transaction on the distributed banking ledger by moving funds from a first on-chain account to a second on-chain account by debiting or decreasing a balance of the first on-chain account and crediting or increasing the balance of the second on-chain account for a transfer transaction.