{
  "manageEntity": {
    "action": "Save",
    "entityId": "308666",
    "entityType": "Track",
    "nonce": "0xf0853f04476d4ff0ee932bb27ff3b68e1e7151b1e616718523c630dbc82149c6",
    "signature": "0x9bcced2b50be2eeba28e3f74562959c00033b0c81242d82cd6b1f20323700de05b919eaeb3b16647681f4389c9c1bf3b8b2653320b66e205fde75373568d55801b",
    "signer": "0xAaC8C964109EDE80328C73e47E438AaCD5023900",
    "userId": "448670186"
  }
}