{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x01c52b6a99c4379eac929ee6b608e09f914daf46b3f822da7f1c7110f95a59ef",
    "signature": "0xa2f6ccc057d580d27b297eae3756acc2b4e858931d0a9429cd3c89be57a6d6ad17593a271c05adfaea0072fb958ce860fcce8b4f0ba63791e46a09a99fc01ae61c",
    "signer": "0x4D07BB19448A58b57Eb9c52daFD861C07b7b26Be",
    "userId": "216060908"
  }
}