{
  "manageEntity": {
    "action": "Save",
    "entityId": "273495",
    "entityType": "Track",
    "nonce": "0xc297dbb57440f0e307dbc4c8357fea0bb2e96c727bad4d4d5ed6a51251feebb9",
    "signature": "0x2e8b227c72bf4d6a7b5b2cba87b75ebd3fdb6e724b4699218537b0c2b025a8a21396f553dfc81356cee46d133dce866e3d7c6bf651d192b7b184c526ede3131b1c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}