{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x339283aa600a2ad207213fd1d855ffcf21b9e975d4b779e76b8525c9efc3e78b",
    "signature": "0xb0b44b498f6d1e26e714499377cebfbec38fefc7ef63d8a92e6c2c3b2f1ebcc56475467e6e6b9cfa0fd3ff0961cbfd52c17c1cce60e446fe130358a80e9a72a01c",
    "signer": "0x3107eD9fc80586B8D3314FE60dc8fE1250CB89d5",
    "userId": "575941305"
  }
}