{
  "manageEntity": {
    "action": "Save",
    "entityId": "420253715",
    "entityType": "Track",
    "nonce": "0x357e784a4e3c91bcff8888081432f212be3e52c0fd346cfe8434ce615a4c0075",
    "signature": "0xbf9a9d6e9c7b766876c4f6693b8d6cc08513d3331ac7f0d572989055954e30393b9771544270f0b2d758e43e7ef002c489f898b52f6e9e0b4201df65bbe636e71b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}