{
  "manageEntity": {
    "action": "Save",
    "entityId": "584021175",
    "entityType": "Track",
    "nonce": "0x87f37af44f59a5d6c3ac188a466fc3e3b921df11538bed19e8ff54088c03b2d7",
    "signature": "0xeab1a0dafc5c52cfba4a2164ef1d004b64700e6d39606843831070d3131915032d10606dfd03d9bac84e7cacb078d88277537d6ff42faf7e529c9e7d4280a6a81b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}