{
  "manageEntity": {
    "action": "Save",
    "entityId": "389223147",
    "entityType": "Track",
    "nonce": "0x20373579816196b731d3437d43750d0b098e3113b344e6f4b084700c6377c23e",
    "signature": "0x2115ab3ccfc7cc908ab6e2bd8218e0d792ff697bbba617e0a0d8cbb84efd2a267ce58325f9c63c8a6e5872b5826f3399271fe5a11a072fad6e60be85ef2cae961b",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}