{
  "manageEntity": {
    "action": "Save",
    "entityId": "2126727704",
    "entityType": "Track",
    "nonce": "0xf1e9f8f22bbb1f7beb4a9d149135678d3e89413fa7f81ca3f36ab9759e421c5f",
    "signature": "0x3dbcfbf35b602fc9474513357f3791aade316bdce6843c125ee80f57f83c683e7a6f021d274a64176217ad89d86cdf47421dd1fba995ad840bd6cb736c91cf231b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}