{
  "manageEntity": {
    "action": "Save",
    "entityId": "1996560364",
    "entityType": "Track",
    "nonce": "0xda98a01d017276ecd0f4e4d9ad450bd341e52d31be384d0f7dc9bdfa161c6ac8",
    "signature": "0x7f9778772259d87686c310edf43e7e3069c9a040b85f744f9a0ddcc230ef3f6025c00d355885abf4aa4051a07e21cc9804ae4754779a09489339b66f1967b0e21b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}