{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x720b784c84ca6e5e1c19edc94739c6b855917430269f56cb543b84e1e10a4863",
    "signature": "0x869141a4999f0205f55f806a8086333eb6b6f3949144fdc27d7dd98edec0f8c272313122ea4d7582fb27c5090eebb54c79b82bf6b9e666f2fb94f93720518d021b",
    "signer": "0x3D7B1Dc2a1aF670A28b72f0313B301921DCCa50A",
    "userId": "533765146"
  }
}