{
  "manageEntity": {
    "action": "Save",
    "entityId": "504107",
    "entityType": "Track",
    "nonce": "0x43e999938099888d51574fe4f9467324307d5b0a2726d310fa7d0acb302a2e71",
    "signature": "0x5d8704d0c48ebcd1c6d4d933ef96c7f3e951c200b992280f2b99f8c32fd336cc47c96310218545a7cf41cca0adfa6df62656e6646f17b82f162105f9923978a11c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}