A public chain of a blockchain is the most decentralized of the blockchain networks. Because it is open to everyone with no limitations, it has more potential for wider applications in various sectors ranging from finance to logistics. This higher degree of decentralization also highlights the great importance of public chain security, scalability, and decentralization of the data stored on the blockchain. Therefore, to ensure that public blockchain networks are secure and reliable, certain conditions must be met.

1. Security: In order to maintain the integrity of the data stored on the blockchain, the public chain should have strong security protocols in place. A blockchain should be equipped with distributed consensus mechanisms that allows it to reach a consensus on the validity of a transaction in a secure and accurate manner. These mechanisms should also be robust enough to prevent malicious attempts at tampering with the data stored on the chain.

2. Scalability: The public chain must also be able to process large amounts of data efficiently and quickly without sacrificing security or decentralization. This means that it should be able to handle heavy traffic and be able to process multiple transactions in consecutive blocks. Various technologies such as sharding and off-chain solutions need to be implemented to ensure that the chain has a suitable scalability solution.

3. Decentralization: The public chain should not be structured in a way that allows a single entity or group of entities to have complete control over the network. Instead, it should be structured such that control is decentralized across all participating peers or nodes which are able to verify transactions. This ensures that all nodes are part of the same consensus and have the same level of control over the chain.

4. Transparency: The public chain should also be transparent in terms of its transactions and all data stored on it. This ensures that everyone is able to verify the accuracy and validity of transactions without requiring any centralized entity to authenticate them. Through the use of the blockchain’s cryptographic signature and the use of digital signatures, the data stored on the chain can be made immutable and transparent.

5. Governance: A good public blockchain should have a well-defined governance structure to ensure that all participants are able to contribute to the development and maintenance of the chain in a transparent and accountable manner. This structure should include representatives that are elected by the community, and these representatives should be responsible for making decisions regarding the operation, development, and maintenance of the chain.

In conclusion, a public blockchain should be able to meet the above mentioned criteria in order to be considered as a suitable public blockchain. A secure, scalable, and transparent public chain with a well-defined governance structure is required for a public blockchain to be used in various business and consumer applications. With this in mind, public blockchains must be tested and verified to ensure that they are adequate for the task they have been designed for.