{
  "manageEntity": {
    "action": "Save",
    "entityId": "1649231259",
    "entityType": "Track",
    "nonce": "0x6f148187023ba3a76cb54273339207094bb30be3e012931ae4835228870a1e70",
    "signature": "0x455c1fa318184657d3b4061101a55e09223edd4362cadd56cb96fec97b4de1784d6f2042eb6411f61e862cfc03684eb1bbf586d808d742480aa5f34f4154e2d41b",
    "signer": "0xD967b68365738013c9197659aAb46EB73a488080",
    "userId": "488430169"
  }
}