{
  "manageEntity": {
    "action": "Save",
    "entityId": "766519",
    "entityType": "Track",
    "nonce": "0x0caf4e6a796d0609ed48da728a7fff50158b4e16330c07c6d876f23a6caec18e",
    "signature": "0xa0dbcfb12b1928fb779d43e3f6b2e2e375d0181c893b08d941347355c9905007295160e3c0b8544e88bcbe89edf1ae2937840c9480b613b478c7927baddd4d7d1c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}