Explanation of Changes and Innovations
Improvements

Field Naming:

Renamed uuid in RegisterUserRequest to user_id for consistency with user_id in other messages.
Renamed public_inputs_list in Task to input_sets for clarity, as it represents multiple sets of inputs.
Renamed all_proof_hashes in SubmitProofRequest to individual_proof_hashes to better describe its purpose.
Renamed TaskType values PROOF_HASH and ALL_PROOF_HASHES to HASH_REQUIRED and INDIVIDUAL_HASHES for clarity.


Reserved Fields:

In SubmitProofRequest, reinstated node_id as field 1 (previously reserved) for consistency, as it’s logical to include the submitting node’s ID.


Required Fields in NodeTelemetry:

Made flops_per_sec, memory_used, and memory_capacity required (removed optional) to ensure meaningful telemetry data.


Documentation:

Added detailed comments for all messages, fields, and enums to clarify their purpose and usage.
Specified constraints (e.g., Ed25519 key length, latitude/longitude ranges).


Pagination:

Added limit field to GetTasksRequest to control page size, improving flexibility.



Innovations

Task Prioritization:

Added priority (int32) to Task to allow scheduling high-priority tasks (1 = lowest, 10 = highest).


Node Versioning:

Added version to RegisterNodeRequest and Node to track node software versions, aiding compatibility checks.


Task Status Tracking:

Introduced TaskStatus enum and GetTaskStatusRequest/Response messages to allow querying task progress (e.g., pending, assigned, completed, failed).


Metadata Support:

Added map<string, string> metadata to Task, Node, and NodeTelemetry for extensible custom attributes (e.g., configuration, hardware specs).


Proof Verification:

Added SubmitProofResponse with verification_status and error_message to provide feedback on proof submission.


Geo-Location Precision:

Replaced NodeTelemetry.location (string) with a GeoLocation message containing latitude, longitude, and country_code for precise geolocation data.


Error Handling:

Added ErrorResponse message for consistent error reporting across RPC methods.


Enhanced GetNodeResponse:

Included the full Node message in GetNodeResponse to provide complete node details, not just the wallet address.



Backward Compatibility

Deprecated Fields: Retained all deprecated fields (program_id, public_inputs, task_id in GetProofTaskResponse) to ensure existing clients work without modification.
New Fields: Added new fields with unique field numbers to avoid conflicts (e.g., priority as 7, metadata as 8 in Task).
Enums: Kept existing enum values (NodeType, TaskDifficulty, TaskType) unchanged and used reserved ranges for future expansion.