{
  "manageEntity": {
    "action": "Save",
    "entityId": "1820851395",
    "entityType": "Track",
    "nonce": "0x18dc24be086160e71e7e607c95c6caeba9127495dca4567affd7bbbabdb20773",
    "signature": "0x9d915084eb385734dd2e21f6a351286d44d9d9d5648ba8f0f4a89f339de9dfc754d4aacb6be553f8598897029a4783811223f255ecd12694345812ecf69460be1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}