{
  "manageEntity": {
    "action": "Save",
    "entityId": "234874494",
    "entityType": "Track",
    "nonce": "0xd2d2f5ba129333203cb2e374e74a14a8344ef7e1ed1e649c29de2d0440e9ded6",
    "signature": "0x0b1318f546feab69ef5d93f48a0c31ee37731a7ed340c42a5c9a9313a6f8bd6e46fbd4127fe37b26c6b1459047f2db737ec739fc67a8bc416921def94ed1e58b1b",
    "signer": "0x44Fe9338D9d1405927C73FDA0be0F36ae481Cd39",
    "userId": "983568397"
  }
}