{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xa708178eb573e0ecee6877a1c1b21b2ddefe0fec41809989df541f18ab49da61",
    "signature": "0xf8b39c4a71b46095e66338d2d0cc37d9a06e0aeeef9e26f96ab8514e68b7e52a21a741d712693a7dd4e69f26c6f6b9202cf052c2498a502de9be38f23a0fb4f01c",
    "signer": "0x4c2B6D597D288449d9F215489E66f1cCe1c85B8F",
    "userId": "721987098"
  }
}