{
  "manageEntity": {
    "action": "Save",
    "entityId": "445855",
    "entityType": "Track",
    "nonce": "0x6a35b6d7e6489709dfdd08fffe04c756f73eeb2507b5048a502f8876e82aa822",
    "signature": "0x5bbc2049edb2b6c89fb8b8093e386ed7bc290a0b463b621c186b4e4e2882e7710caf34122d28f960d7d430436076343f3648d8fb93dbe56fcdff067396b15a941b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}