Protocol Format

All data-types bigger than 1 byte are stored in network endian (big-endian) unless stated otherwise.

Request Base

Name	Size (bytes)	Description
opcode	1	The operation code to perform, A list of operations currently supported (and their data) can be found in the Operations chapter
request_id	4	The ID for the current request, Used to distinguish responses in the current connection

The data afterwards depends on the supplied opcode, Please consult the Operations chapter for more information.

Response Base

Name	Size (bytes)	Description
request_id	4	The ID for the request that this response is meant for
size	4	Size of the response (excluding size of request id)

The data afterwards depends on the supplied opcode, Please consult the Operations chapter for more information.

Operations

FORCE_UPDATE (0x00)

Forces the server to re-fetch the YouTube player, and extract the necessary components from it (nsig function code, sig function code, signature timestamp).

Request

No additional data required

Response

Name	Size (bytes)	Description
status	2	The status code of the request: 0xF44F if successful, 0xFFFF if no updating is required (YouTube's player ID is equal to the server's current player ID), 0x0000 if an error occurred

DECRYPT_N_SIGNATURE (0x01)

Decrypt a provided n signature using the server's current nsig function code, and return the result (or an error).

Request

Name	Size (bytes)	Description
size	2	The size of the encrypted signature
string	size	The encrypted signature

Response

Name	Size (bytes)	Description
size	2	The size of the decrypted signature, 0x0000 if an error occurred
string	size	The decrypted signature

DECRYPT_SIGNATURE (0x02)

Decrypt a provided s signature using the server's current sig function code, and return the result (or an error).

Request

Name	Size (bytes)	Description
size	2	The size of the encrypted signature
string	size	The encrypted signature

Response

Name	Size (bytes)	Description
size	2	The size of the decrypted signature, 0x0000 if an error occurred
string	size	The decrypted signature

GET_SIGNATURE_TIMESTAMP (0x03)

Get the signature timestamp from the server's current player, and return it in the form of a 64-bit integer

Request

No additional data required

Response

Name	Size (bytes)	Description
timestamp	8	The signature timestamp from the server's current player