{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x9702546d298ceb434b6eb00e95d362eeb16104d2c651977ffcfce404dd91b42b",
    "signature": "0x9947c1d58b8f07ca9f0ebaaf439c3012fe463dac0a02603bd08207e3cabafd6a5d49291dc345ab91bc74d65ab29c6049d02bf65b6ce739622e3c1abf323e7ccc1c",
    "signer": "0x16741B6206B1898558AAd9b1FA3d2E2d94277708",
    "userId": "622688980"
  }
}