{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xb1a5285e17c88b034e28d01fb57736a7227f29eadf4ca099a961153bff7e0d48",
    "signature": "0x5552a592d5b874bdd524b5fb2c2e72ae0c264d88d6c653d5e99d2298f2abcedc34477fdc7cf2bb2b4851d67989ecadbac65137b67d6d964b02631d90826542db1b",
    "signer": "0x6370bBD2Af458B7e9105B70aA4C95049deA95a6E",
    "userId": "753303354"
  }
}