{
  "manageEntity": {
    "action": "Save",
    "entityId": "541223",
    "entityType": "Track",
    "nonce": "0x6cb1dafe3bc340a1e839506ea107c9f119eac3dd287233cf2fed6d18f33a0eac",
    "signature": "0x9dc6d01080b29bf7ff2411ebf39368fb62159b946dc48d73c6d9496bf15623d552a66da321a7a83097e091f4cbca289efe89355dc7523b69b5eb56d20b3155931b",
    "signer": "0x9Fa5E44ADd28caB1F5D45992F003ba0455ff36e6",
    "userId": "543686915"
  }
}