{
  "manageEntity": {
    "action": "Save",
    "entityId": "478457403",
    "entityType": "Track",
    "nonce": "0x4236f3cdfaae97c90906530564e6fb13da4cf33207129f5f32c2fd95511da9ac",
    "signature": "0x40370eb946aa8d62b24d41f3e5c95de90a7e85aa3340eea98beaa1f88f6df7b1548b291c36c326c51bca90d8fc311f8e8a8133fd4f254e0c125f6a5a0a9a88991b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}