{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x92e2a05859e9b915af2e698c2f32b7aa8ff3a0e01dc5485fe06d3cbafab6077c",
    "signature": "0x1374a65026c6c2bb88975ef68c3473327a46a6cac700d15d1f36a2f1021e13d319a42a5c0ed19e72382132e715ee6dadea908c02bd0bd1eeb0853b0af210e1411c",
    "signer": "0x129cD5f15608Aa6d10d553f85023e9f6f6f30d9c",
    "userId": "547925274"
  }
}