{
  "manageEntity": {
    "action": "Save",
    "entityId": "349969375",
    "entityType": "Track",
    "nonce": "0xadbf38198afe4ecc9a1ee591b3d6817aa96cae431976aff40de65d6f218e23ff",
    "signature": "0x7cac26c736ae2d92d602ad282b7888f7e40d287d528b66a1d840072395c04c9c21bd90ababa16121d3b85c08a880bd3b4cb982bf9077186a00cb27837c36c8fc1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}