The messenger BlueOcean is decentralized, using a distributed peer-to-peer network, so access to it is more difficult to block than to centralized messengers.
All messages in BlueOcean are encrypted using the recipient's public key. The message decryption key is held by the recipient of the message, so a third party cannot access the message content. This is a fundamental difference from centralized messengers such as What's up or Telegram, where the keys are stored by the operators of these systems.
When using the messenger BlueOcean, you do not need to register or link it to a phone number, unlike existing centralized messengers.