{
  "manageEntity": {
    "action": "Save",
    "entityId": "719572207",
    "entityType": "Track",
    "nonce": "0x71603a29e0048f891595b14b5f52e991e7cfe6613cc74f19eab5f276b40fa1fb",
    "signature": "0x99f9f73063d6eab7c3dd6f41f1f3f19dc3a16d5f8d74f4811ee2bb1e8256b97377af1a3bb86ba2b2552f4e7f06b54199c349b27adb38667109d97d1952a551491c",
    "signer": "0xc97A6025Ad8c7Ba1a35Ef7E3A3b88ABc8b2013BF",
    "userId": "666092734"
  }
}