{
  "manageEntity": {
    "action": "Save",
    "entityId": "602147311",
    "entityType": "Track",
    "nonce": "0x768df32386ade7c7e6c2d700e8f1fd7e9334f9417ce4c55d9094ab089673873d",
    "signature": "0x07ad5d7af455bb987cd35cd181ce54009d8999bcf1e5a55c74ed2f76b3387ebb39be595e73997bc589dcb79350319a11a058ea9e96a12cba4ab5aa640ec49bc91c",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}