{
  "manageEntity": {
    "action": "Save",
    "entityId": "549177386",
    "entityType": "Track",
    "nonce": "0x953eaf679f4c287c7564e94eb6e92226b4eff40494c08a95007ff67b24ca0aa4",
    "signature": "0x2c36cd984f65a364b58f8513b0bac7578e76dff52b2beff1afe2576f1e24f3f108893be87d318660b8033a69f9f424aeb8db248d2ab9b38605e30225b4dcc9e91b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}