{
  "manageEntity": {
    "action": "Save",
    "entityId": "999978794",
    "entityType": "Track",
    "nonce": "0x5baefb80f6186a4b26006abffaa0559edf7f62b6b72a65815480533710c47a32",
    "signature": "0x924f0ba9df4c964b07346b508465dfc6f165b21ea8578655ff94767a00d952e2573ad89a51398a975d6ce11e759b2fb587be2ed454760cb885f0beead96139381b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}