{
  "manageEntity": {
    "action": "Save",
    "entityId": "144395384",
    "entityType": "Track",
    "nonce": "0x57a3bd334aeed0e17e82b7e6e7d2c7ba8403b84d9b9c7e118073ff5615543a9f",
    "signature": "0x6a7f6f74517558be16ddad1e0917c0a1a24b9f56b8ead939966bb3b5b74a47b91bd60d13cae137043bd8f69a543cd9885af20573d3a529f1159b575e05a525211b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}