{
  "manageEntity": {
    "action": "Save",
    "entityId": "1387942429",
    "entityType": "Track",
    "nonce": "0x90e43bfe6ebe1dac25a39a1b2c3a9552de7132298f18a5d1e17fee5d77a56b8e",
    "signature": "0x2b9eaaf9c7493bfb116dbe31ad2aa318a402066192e0650cb69d6bfaeda63f632e32da2463035b572fc546d767b42838d9b4ab34732f1e892a9b9442c71830211b",
    "signer": "0x36d29AA5C780341f3b35bDE6c1411a7Abcf8794C",
    "userId": "571117272"
  }
}