{
  "manageEntity": {
    "action": "Save",
    "entityId": "558445170",
    "entityType": "Track",
    "nonce": "0x8a4a9e5a57beb87e7bd884abc60a8a986251644905964d9cdb8e1e46ccb44b9d",
    "signature": "0xd1464c60e471f3ec2e4e7523398f1edc53084690831661a7ec4a07c74b6a283147239636fd3ae963474d30ee0452790fb5bb18de096ba1af01a91f065169a4721b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}