{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x2a383972340b187452b55244161338f357fc494d9d5bb95a7cc3627ba9575f71",
    "signature": "0x3599806b44bb0d6850e102e08073c3a266f5a24622c61426787bb1a5454c0e3f7d33a4e0ae1c290830b56a0be0d94974d94fc63d803d60770456dcf53e0d6b3b1c",
    "signer": "0xDC9FB11483106d427BaC29ff4bf0E03f11b4e19E",
    "userId": "5500"
  }
}