{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x81555e27ae9ac4ddbae8ed03869715d85aaa5d10fe407d4fca1b5a2caa9cf7e4",
    "signature": "0xeb0388510d67be3c1dfce300c8e2feec3b8a3519d993103ec28af2b628b61e8a33b6e97613fa46e2a0c137d41f89c37606ab2be9e9a8e1e585eda1d1e1041bfc1b",
    "signer": "0xdA4448A94942BB1d74B134dAe4e71F0A65E8a180",
    "userId": "669480134"
  }
}