{
  "manageEntity": {
    "action": "Save",
    "entityId": "406194",
    "entityType": "Track",
    "nonce": "0x444017ca0e62a7f11a4fe897c29f7c55285fe5599a01aeb0e6481572eb11d34c",
    "signature": "0x9f129308eb4dd5e80ae5399176d5e117fa4efac176d7b93b115cc62070f6913a285ab98b05ad0df0a8cbce4da86547dcc67433dfd7dffed2b9bfbb05967acebf1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}