{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x0e3b958b2554ceb1dec3b9ee6e59594492354039b0a76c3f3378c7ee28c0e3f5",
    "signature": "0x3a7ef69654ab294a3e09204654a447d1fc4ad5e0f396c50e02c8325359400284093855e6fd2d90cd252e6278bec3cece4f87f2eb33234969e83d4a276191d22a1c",
    "signer": "0x434E6E903F887d1123e2415651292ED71aC170Eb",
    "userId": "643976014"
  }
}