{
  "manageEntity": {
    "action": "Save",
    "entityId": "764530989",
    "entityType": "Track",
    "nonce": "0x23d1dce28642b513050fd0998064f126c5dbd8f02362a3dd1d70cdbad8b84f55",
    "signature": "0x03c9c34b2ae25b138b6b34242018d135fda981991bb2226c497a04275ce98d0801b07b306d2033a5270630331019ea0d2f281685fee965f6f8dfabcb5398a37e1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}