{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x9d62cb093096235f43eb167aab52eb737c7e514da441d98298390453c9cd7822",
    "signature": "0xc02e2a1c3a3ad11ea96ca68122301d1025c1248f805c6f8cad3500b7ff772cac768567c2c30eba81d7659c0cdf72e497a6d62c6dde04a6939d1c3dc5cc9f5c681b",
    "signer": "0xc41a2793553c2dB6040EA2a8236d996517266741",
    "userId": "825416560"
  }
}