{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xc9ccaaab093b78fa416e307c037bc6eddde47ecf55acc8c99ca5bbd9ae6e5f7f",
    "signature": "0xb5a1b8aa4d0b4b80764591c0991dac3c036218f33e4354abe9ee225d6ebabf183a286f6bea4e17672d0381bf6ab59d025fbfbf480f0a7a9ef62ccab0eb2ead921c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}