{
  "manageEntity": {
    "action": "Save",
    "entityId": "351342",
    "entityType": "Track",
    "nonce": "0x4057efab98d4106966695fc48fd8fb0ed2075950b58fecd7421bced5bef98780",
    "signature": "0x7e34fbdac782c6e19cf37da41fee2203ff12d5cf8d8c0f475b4742b35f2f964a14d6fe602a2f08426d70736d9370b4e7864e71b40625809f6eb53271b16f98e61b",
    "signer": "0x428df7C89b250770b2C984e1AFc3524CfB11738c",
    "userId": "410571818"
  }
}