{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xa912593b7bc41fc3cf6e70d438be8977136093081270dd4db78869388f5270d5",
    "signature": "0x1e2a28e0ffbbb87bc8a735e9a664511cc20dbeda2ffe1fc9131b1de2ca8a8e9f76bebeb050a6d4d7abde00a49bf9a9e672d3dae40f11c41001dbbd10538f0e7c1c",
    "signer": "0xa3057aF73102b25DCac3840DbCeBaFd42e2C63Ff",
    "userId": "357213672"
  }
}