{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x502e94388f1a397012b45f7f144981934431e0e10b5d860b23dde5d9c191cde1",
    "signature": "0xe6ba06b0ceb76e822dfdce84e8f2edb0ed1dee97870fd540af34d011e34433d8694ace18c8829b70e01151b4ada1873ce05e0a2e5e865aed9993f642928973d41b",
    "signer": "0x6268f3F36E0fe8D3E139bC6d32d7539887721848",
    "userId": "418312750"
  }
}