{
  "manageEntity": {
    "action": "Save",
    "entityId": "304400863",
    "entityType": "Track",
    "nonce": "0x9a9a9b6ecac995b8f01b621826f776da9d0b091c0bd03ec0a7bdc10c1f889173",
    "signature": "0x364cca579552f851d512b649cde9c650fb93ebb09dbe32942f6e1631cee763c94752141f73170851d6d74c279f32139f87dd449b6d3ce58477c787e8b2ccfe891b",
    "signer": "0x1Ef5331d98352E3A7eb4f177ae6BbD27cA99eD1B",
    "userId": "771602835"
  }
}