The Presentation Layer, also known as Layer 6, is responsible for converting data into a format that can be understood and used by the receiving node. This layer is responsible for:

1. Data encryption and decryption

2. Data compression and decompression

3. Data formatting and reformatting

4. Syntax and semantics conversion

Protocols that operate at the Presentation Layer include:

1. SSL/TLS (Secure Sockets Layer/Transport Layer Security)

2. ASCII (American Standard Code for Information Interchange)

3. JPEG (Joint Photographic Experts Group)

4. MPEG (Moving Picture Experts Group)

5. GIF (Graphics Interchange Format)

The Presentation Layer ensures that data is presented in a format that can be understood by the receiving node, regardless of the different hardware and software platforms used. This layer is critical for enabling communication between nodes with different data formats and encoding schemes.

In the context of blockchain, the Presentation Layer is responsible for formatting and encrypting data for transmission over the network, ensuring that it is secure and can be understood by the receiving node.