{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xc9120bf5c4c643b163eba8778a0f2b8a30e3da19f0638cdd4d6497c3c7fd4b30",
    "signature": "0x2c2b6a49525c75c667a6bebeb424838b1daaf5770d7dd03c78036f931fe016df32fb1115201a9ed7f6ecc0e2b5c6709f2bd2c4ab774387adfc81584a0e1739ac1c",
    "signer": "0xc010189B56dc4f007Ad13fbF27F6224d1F951393",
    "userId": "454551282"
  }
}