{
  "manageEntity": {
    "action": "Save",
    "entityId": "1557189830",
    "entityType": "Track",
    "nonce": "0x238ef8d0824f37510d196e9de2a1c7a153bb2ebd7a606a5ff7b16c367d631262",
    "signature": "0x6a86eb4b655aceef653492e8c77d4abca53cbe4181caba627a307fba4f992c263b5930ebc7973c2767ffed69cab0c2de7e8481a30973d590af4d173455bca34f1b",
    "signer": "0x27204C77Baa4a510c92A96A4ba3661CC53EE568E",
    "userId": "35918963"
  }
}