{
  "manageEntity": {
    "action": "Save",
    "entityId": "514568771",
    "entityType": "Track",
    "nonce": "0x11656276141eebf0b22fe634f1ac3e920142a603336e515724ec69a2c87bbdd1",
    "signature": "0x7a918058c1759b9368d3cc83e5945d1847034037c316c9a5c6340fc0b9b8deaf5a45d76b0460b92a9b2ad927f44b62f4ac11a8bb88d35a63ed811c2fb258a1661c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}