{
  "manageEntity": {
    "action": "Save",
    "entityId": "1508175406",
    "entityType": "Track",
    "nonce": "0x74e78d5fd0d9c3033ee3726b77372402d261c7b623be3f0d277d47e9ab351398",
    "signature": "0xb2fe44916823ff65b10c025801cf94b57a9e2efbef42800e7af3913d699067225313e573fa4b329f11e630a63404911e2ebc29b885d7f59fa7f8d9ad46eaf6361c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}