{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x12d03096342e5bfa5caad7d49cbcad7f3c30219f13fa01fe9e2630249e039f89",
    "signature": "0x3c4ff8769edc175328b1877efedbd90d8d005ecc3ee5580283fcae89abb548b11ce02449da6fa182e559f826b1f40cbd31eb8c5364e9c9f0b3edfc38e545f2b91b",
    "signer": "0x57f37dA62FDB7b38d5117E84b763cDbc7085736e",
    "userId": "826489117"
  }
}