{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x4ef5c874cf1aad90e2e8979e059efe9de393b02e724e0d8b47a08418ea89f9e1",
    "signature": "0x6b54cd17a967d5cf99cb0be09ec8bdb76cfbb5f82b57551b95a20ead65e812e90dcfa7d2b2643c03fbfc44cf0fd73701c11d0aa0165f376c4ba38ab49847a5561c",
    "signer": "0x306F12d5f97327a8099a74CdE3603214150d7e5e",
    "userId": "197430922"
  }
}