{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xe8ea4f1f1b06f0d6628a9a2bec59b78a54661a162bcdb21b7db61c4961f36092",
    "signature": "0x63ba2968688ca52193c20a53c7e78141033ede2b7dd1361e16f0b27d6da5e51e4366dc907af2a8d62e38ac193c150b901b1772331aa5dab62d5fce551639b8211c",
    "signer": "0xfffF643204D053ae5bFC296Aa20F15313084C719",
    "userId": "473911971"
  }
}