{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xef7122d1d5fb63b5433b0a1d86ca0a433d7daa66f139ed8e989abc2105fa0b71",
    "signature": "0x4b12fcfdda7de18dc5f989461e18a1268f41f75e24328f83286d1a0488d8c37b7c8a62f9a6f3b8dabbed1d11b907b26daae26d8153bd3c528978a00a4a4e16581b",
    "signer": "0x8ecdAD7a1a8A083C14D67BEBDf3477A368C3F2fa",
    "userId": "771808284"
  }
}