{
  "manageEntity": {
    "action": "Save",
    "entityId": "489874",
    "entityType": "Track",
    "nonce": "0x24e69689532817a7f8d41883cf82992e91d09391eb9299d9e9faa14c580e18a1",
    "signature": "0xc2a0f993701ec968766e07956b63cf01f20f10f4e87dbd47f2f4d2aa8269289378e4f5b17886ebd3dc0ece68b8b5654beb630e29554cc2b7e234c9f5185b72981b",
    "signer": "0x27204C77Baa4a510c92A96A4ba3661CC53EE568E",
    "userId": "35918963"
  }
}