{
  "manageEntity": {
    "action": "Save",
    "entityId": "783802144",
    "entityType": "Track",
    "nonce": "0xf2a71bd4e83fdec088c864227bf340b062803b68afac7caf255cfcb341b90c0d",
    "signature": "0x7eca94e2ccb0505c93978b776f830ca2ee335ee3f4902f33dddeadfa5b7a60a0692075c5b4d58e09ea27509657ac2308031bb62115169d73a61e00519d617b5a1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}