{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xb58696bee9a534f8802f33b7e3fc0ef2a7e3f0145e1dbfc28f8fcaee8e9c8572",
    "signature": "0x28eb03e77577114baf10a437d63ec693106db02b91599a153273c35caa9d6b137f9d00e33783fba8a83c4e62cf4e1dfb6b2e01a458e4992a17b8d57b126aab241c",
    "signer": "0x77588d912791aACbaCe2BCBa5145b55EF42c200f",
    "userId": "61246183"
  }
}