What is the best way to check if a specific property in my model has been modified?

I have the following model:

[Key]
public Guid SessionId { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public string Address { get; set; }
public string Address2 { get; set; }
public string PostalCode { get; set; }
public string City { get; set; }
public string State { get; set; }
public string Country { get; set; }
public string PhoneNumber { get; set; }
public string Email { get; set; }
public int Guests { get; set; }
public DateTime CheckInDate { get; set; }
public DateTime CheckOutDate { get; set; }
public Status BookingStatus { get; set; }
public string Notes { get; set; }
public DateTime CreatedDate { get; set; }

I will be creating DTO’s from this model but i will still need the SessionId property to be included in some of those DTO’s.

My question is how do I check the state of the SessionId property to make sure that no one has tried to tamper with it?

My worry is that someone could interrupt the post request and try to modify the SessionId specifically and mess around with the update to the database.

Ideally I would like to check if the SessionId property has been modified and abort the update entirely.