{
  "manageEntity": {
    "action": "Save",
    "entityId": "515561413",
    "entityType": "Track",
    "nonce": "0xaec21215a9a332855a4553ba9e409121a20009f5c6f76e29ae673345bd2e51f7",
    "signature": "0x6fe88de5cd810c9d76e42cf3ada3bc1e69027eb29ac26294a7be22d69c5a665c7c959f37426122872ed196c7494a84b61b2a156a151a992ee49b0de0d1a817ec1c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}