{
  "manageEntity": {
    "action": "Save",
    "entityId": "1561690457",
    "entityType": "Track",
    "nonce": "0x8fe748c8bcf2b80b5fcb529eacdf213c05c69efc48f989952b7df136441847a7",
    "signature": "0x1482f579a4d4052e8ca19ffb2645e92729114272337b539eaa11084944545d7c20eef34eecd9fc22d1f43b7fafc483a1e67a593e7f0380dbff991cea5955f4c41c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}