{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x134d550c360209fb57143166fd74b780fbb3992bd405e934674546eb5f31122e",
    "signature": "0x0af17f5c1ff603f13e038b89ce5d091ff4f5ee4770227b87e7c2326aa686a6ff02cc526a06a0e26fd86d932e1c05d4e0dd95c73f076396f5ece32d0b8c714afc1b",
    "signer": "0x9DC51c89EB69CC9c54d44521443ac750aaBf3c18",
    "userId": "759573568"
  }
}