Multi-chain deployment in Blockchain / Solidity - Step-by-Step Execution

Concept Flow - Multi-chain deployment

Write Smart Contract Code

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Compile Contract for Chain A

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Deploy Contract on Chain A

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Compile Contract for Chain B

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Deploy Contract on Chain B

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Verify Deployment on Both Chains

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Interact with Contracts on Multiple Chains

This flow shows writing a smart contract, compiling and deploying it separately on multiple blockchains, then interacting with each deployed contract.

Execution Sample

Blockchain / Solidity

pragma solidity ^0.8.0;

contract SimpleStorage {
    uint256 public data;
    function set(uint256 x) public {
        data = x;
    }
}

A simple smart contract storing a number, ready to be deployed on multiple chains.

Execution Table

Step	Action	Chain	Result	Notes
1	Compile contract	Chain A	ABI and Bytecode generated	Ready for deployment on Chain A
2	Deploy contract	Chain A	Contract address 0xA1B2C3	Deployment successful on Chain A
3	Compile contract	Chain B	ABI and Bytecode generated	Ready for deployment on Chain B
4	Deploy contract	Chain B	Contract address 0xD4E5F6	Deployment successful on Chain B
5	Verify deployment	Chain A	Contract verified	Contract accessible on Chain A
6	Verify deployment	Chain B	Contract verified	Contract accessible on Chain B
7	Interact with contract	Chain A	Set data to 42	Transaction confirmed on Chain A
8	Interact with contract	Chain B	Set data to 99	Transaction confirmed on Chain B
9	Read data	Chain A	42	Data stored on Chain A
10	Read data	Chain B	99	Data stored on Chain B
11	End	-	-	All steps completed successfully

💡 All contracts deployed and interacted with on multiple chains successfully.

Variable Tracker

Variable	Start	After Step 7	After Step 8	Final
data on Chain A	0	42	42	42
data on Chain B	0	0	99	99

Key Moments - 3 Insights

Why do we compile the contract separately for each chain?

Because different chains may require different bytecode formats or compiler settings, as shown in steps 1 and 3 of the execution_table.

Why are contract addresses different on each chain?

Each chain generates its own unique address upon deployment, as seen in steps 2 and 4, so addresses differ even for the same contract code.

Does changing data on one chain affect the other chain?

No, data changes on one chain do not affect the other, as shown by different 'data' values in variable_tracker after steps 7 and 8.

Visual Quiz - 3 Questions

Look at the execution_table, what is the contract address after deployment on Chain B?

A 0xD4E5F6

B 0xA1B2C3

C 0x123456

D 0x000000

💡 Hint

Check step 4 in the execution_table for Chain B deployment address.

At which step does the data on Chain A get set to 42?

A Step 6

B Step 7

C Step 8

D Step 9

💡 Hint

Look at the action and result columns in execution_table step 7.

If we did not compile separately for each chain, what would likely happen?

A Deployment would succeed on both chains without issues.

B Contract addresses would be the same on both chains.

C Deployment might fail or produce incompatible bytecode on some chains.

D Data would automatically sync between chains.

💡 Hint

Refer to key_moments about compiling separately and execution_table steps 1 and 3.

Concept Snapshot

Multi-chain deployment means deploying the same smart contract code on different blockchains.
Each chain requires compiling and deploying separately.
Contract addresses differ per chain.
State and data are independent on each chain.
Interaction with contracts happens per chain.
Useful for wider reach and redundancy.

Full Transcript

Multi-chain deployment involves writing a smart contract and then compiling and deploying it on multiple blockchains separately. Each blockchain requires its own compilation step to generate compatible bytecode. After deployment, each chain assigns a unique contract address. The contract's state on one chain does not affect the other chains. Interaction with the contract, such as setting or reading data, happens independently on each chain. This approach allows the same contract logic to run on different blockchains, increasing availability and reach.