{
  "manageEntity": {
    "action": "Save",
    "entityId": "1474723003",
    "entityType": "Track",
    "nonce": "0x40599fcdb03db6f7763f3229eac783f7a320b5fbc366aa3c18a0c60a0d4b630c",
    "signature": "0x8d29c4513b285272ec783198137138750defbe71070f4d42f8e1eed273ff2d5e3ac3b307a9237b027e99bb19c411ee450937c8457861c1149197dbda23eedad01c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}