{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x464b62ec2bbb11b0684480acd9cfc5658d4c095f5eb7187e115302ef01ddc7a6",
    "signature": "0x08ec2e63421ad116130a7cb3f1d1fb215a4c21ccaf8574e154299f859057538e0923854286ed3274d97b6e50d352b32e647f4523072ee50632fed9c188e5656a1c",
    "signer": "0xd4172DACb313eb72C6Ee29bc685450908f4A1926",
    "userId": "407046354"
  }
}