{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x0b9abac44272eb5f9fc8fc175f47630cf4fa86036d07cb10cc23b658f010c451",
    "signature": "0x1ca6113939a19f04370bcc70f5ede2a29703a13a50ae0753b248ed03a8e2b80009a90f28b174a6828b538a5458fa71e5c5459dcb70a95e0ed4c2cb074c9090271b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}