Introduction

ShardCon is a layer-two framework which aims to efficiently and securely support arbitrarily complex cross-shard contracts in blockchain sharding systems.

ShardCon has the following salient features:

• Compatible. ShardCon can be easily integrated into existing blockchain sharding systems with minor modifications.
• Low latency. ShardCon can achieve low confirmation latency of millisecond level for cross-shard contracts, which is far lower than the current sharding systems.
• Complex contracts supporting. ShardCon supports the complex cross-shard contract execution, which enhances application areas of sharding systems.
• Secure execution. ShardCon can guarantee the secure execution for cross-shard contracts. Any misbehaviors performed by users or off-chain nodes can be detected.

Demos

1. Hello World Contract:

• Print: return a "Hello World!" message to the user

2. Token Contract:

• Create: a user creates an account in the Token contract
• Get: check balance of a user in the Token contract
• Transfer: a user transfer his token to another user of the Token contract

3. Vote Contract:

• Nominate: the contract creator adds a set of candidates and specifies a group of users as the voters
• Vote: a voter gives its ballot to a candidate

4. Auction Contract:

• AddItem: the contract creator releases a new item
• Bid: a user bids on a specific item

5. Complex Contract 1:

• call1: the contract calls another contract

6. Complex Contract 2:

• call2: the contract calls other two contracts

How to use?

step 1: build the Occlum

please see https://github.com/occlum/occlum

step 2: Start Chainspace

please see ./chainspace/for_testing/README.md

step 3: Start test the performance of our model

Enter the ./Client directory, and refer to related README for different tests.