{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x7d448b197c993d49902721527140a856ca4cf32132f825d7722295f42b4a0345",
    "signature": "0x8176071b7f0055db6769ca08d1ba34934e2e7e2b335a45481a1599bd7f170daf419e222dc55dbac9cf2979d26927b114ebb8007982437e675a7fb7219ecdcc1c1c",
    "signer": "0x9ab213206F24341678ffE261796E519dfd1861A8",
    "userId": "304414456"
  }
}