{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x42d20ca3cd703b29c29b5cfa248fd213aa748a117d97d604f5cdf2843b2fe44f",
    "signature": "0xa43db42103a015fb4c7d901606988bdc5f25c023a448ecf44bf3577926b5a4dd738398dcd13d6ce090e573b89aef3cec024faa55bdcd0b72520b354c37df75e11c",
    "signer": "0xaf18bF4a2a2c49A50A8Ee5bE0a227FF7577E4889",
    "userId": "153639946"
  }
}