{
  "manageEntity": {
    "action": "Save",
    "entityId": "1756821601",
    "entityType": "Track",
    "nonce": "0xd7e8b39bcbbf9d2224017b392d3a1ce9df2c9dd070bdf3fc8c8ab76cde031500",
    "signature": "0xd9fc12bbef95e02f81f2fc5a45df7ccf159df0370f097df56296b5132075bb687084ac68b4f9940b9023b4c0ac26abfecd056adc93c8e203e8987f4e4ae5862b1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}