{
  "manageEntity": {
    "action": "Save",
    "entityId": "1421262625",
    "entityType": "Track",
    "nonce": "0xd638ff3fc1536440dd25ee6fc128d94ebf416697685677339ccb7ba9a3ec1927",
    "signature": "0xf9d9933c07f401870756ed74fd86ab9c61f7cec705956ad3d4a11edc91669ad05ff940a4680b8d33280197a967374f996e8c0213852de1ef310be3c8c28598a71b",
    "signer": "0x38C35E6d98e3a8e47c96Cc5d8e8DC05C8797Ce75",
    "userId": "266305231"
  }
}