{
  "manageEntity": {
    "action": "Save",
    "entityId": "1544909902",
    "entityType": "Track",
    "nonce": "0xeed603acb0c9a7177dacc41c79fea10c02eaa6ebd39271a06235fd1a9e965f01",
    "signature": "0xb64b5837f4253cd72840c134b4fee05217aad78eef97b9a168b046fce5b8d64a1f2c9a15533cf22e50f36c065427e839a9e8d95f4e1002a874e37d2ac5d6afbb1c",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}