{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xb8712914636e0b258ad24233ecde1460c21a42f97a6da137103939c1c8fb6872",
    "signature": "0xf1ac0e1d45f16b02939ab110eebf8dedea3970b47bd98fbb4d4c38ecb714cb81063b0d04ec1e3b71b95f51fc7d8cb4fd07c9e554c0f6239689ebd490102072ab1b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}