{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xbaaa0dcba2e451543ad6f11fe0a2219e051bf44952ca4e0e2372313a73e5b382",
    "signature": "0x4c1a262a09a71cde5620040c1972ae330a1f7d8efd095e0f3048dcfbed415dd15fee340db7131db534a0490cbdd1683bc2e74ad4d55c981c03c6e9ffb18e68311c",
    "signer": "0x4AD1829e273b8aaA748a011e03b9d1A1f6e4166e",
    "userId": "816241514"
  }
}