{
  "manageEntity": {
    "action": "Save",
    "entityId": "444307264",
    "entityType": "Track",
    "nonce": "0x945a5500c7307f4a8aa240e52c14933bc831eb5b8a432c6debee3168b1bd8a80",
    "signature": "0xe73719a30bd4bf0fc78e266bfdd2127b909660841fdad3ced195882c4131995e6ea13b840c991581983b23efc0406c10d0f6082c7d9a3e31309ed01fa61c74471b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}