{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x4619ff3e48e8389b2510d5d4da43e3fb612944e059fbaabadd274911db5fa6fb",
    "signature": "0x66db008ab799008f50c19a475fdb3ac688abe4ea8ee26a6a166f028a331ea815037a5fcf2e98d158ba823fc3cfd014445ec69ce1179ec6b3b8629e67222611f51c",
    "signer": "0x21198aA949A873f1DA666C84494858c09D2914e2",
    "userId": "596794655"
  }
}