{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x37ec28d2711913e1da35789b3854ee946ad810bef7491efcc08720c2b460bc5a",
    "signature": "0xab8f91c13244871a7eaaa6beb3e31339d26444052380a7f06f0966021e5aefea76cff4acde33cdb24868cb09b16c9f470b48bfcc357dcd52dda7ad93fb60aadf1c",
    "signer": "0xbf6Ff2edf7a073E7aa581c1C1286c7e75794f615",
    "userId": "457641713"
  }
}