{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xbe56e4fac023a3e246155455446975e6b554e0144b4fc2030e1003b90fa109cf",
    "signature": "0x41a84cde82a8329e0bb13a64f468352d93f0e3326f52535a10fd9f1c02bc04c45c1265cdef8be6442434b0f04fb6b9bd170248240cda8f3424b6f99e9a3fa8821b",
    "signer": "0x8621f1bc2d21D4C5Dc82090Af12F8DA289cc1100",
    "userId": "15990581"
  }
}