The international law of the sea treaties imposes various obligations on contracting states, which can be managed more efficiently and cost-effectively through blockchain technology. As a disruptive tool, blockchain allows stakeholders to track transactions in a secure, cryptographically verified public database. It ensures a secure and reliable record of activities and information exchange governed by international agreements. This paper explores how the blockchain-based systems could help protect the maritime community and support sustainable ocean governance under the law of the sea. Particular attention is given to conserving marine living resources, protecting the marine environment and preserving marine biodiversity. Blockchain is already in use for some internationally regulated activities, such as electronic data interchange, though electronic permitting still waits broader international approval. Besides the clear advantages of blockchain, its legal, regulatory and other concerns must be addressed when considering its role in implementing international treaties. The author aims to explore whether harnessing blockchain`s potential requires new international agreement or if a simpler soft law instrument could provide sufficient guidance and safeguards for the international community.