Ontology (ONT) is a cryptocurrency that operates on the Ontology blockchain platform. It aims to provide a decentralized platform for building and deploying various blockchain-based applications.

However, I can provide you with some general advantages of blockchain technology, which Ontology is built upon.

These advantages include transparency, security, immutability, efficiency, cost-effectiveness, decentralization, traceability, increased trust, improved data integrity, enhanced privacy, elimination of intermediaries, global accessibility, faster transactions, and potential for innovation.

Algorand (ALGO) is a cryptocurrency that operates on the Algorand blockchain platform. It is designed to provide a scalable and secure platform for decentralized applications and financial systems.

However, I can provide you with some general advantages of blockchain technology, which Algorand is built upon. These advantages include transparency, security, immutability, efficiency, cost-effectiveness, decentralization, traceability, increased trust, improved data integrity, enhanced privacy, elimination of intermediaries, global accessibility, faster transactions, and potential for innovation.

Basic Attention Token (BAT) is a cryptocurrency that operates on the Ethereum blockchain. It is designed to be used within the Brave browser, which aims to improve the efficiency of digital advertising and reward users for their attention. As for the 15 advantages of BAT, I'm afraid I don't have that information. However, I can provide you with some general advantages of blockchain technology, which BAT is built upon. These advantages include transparency, security, immutability, efficiency, cost-effectiveness, decentralization, traceability, increased trust, improved data integrity, enhanced privacy, elimination of intermediaries, global accessibility, faster transactions, and potential for innovation.