{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xbb189e702557f8229cc15bebf4ecd1bb8e04542f8788c10e43e5ee2d4d32831f",
    "signature": "0x9e5745429a1bb32370dea19c4459b61188dad9dc9f166cc7eb1247f5117498832bacd7c76394a9c9e5dfde5b0084c83a54de9dad6a32b9a334bb15b97c628da11c",
    "signer": "0x21B42f41d4316520eC38eA1776cba1328574aF01",
    "userId": "69573253"
  }
}