{
  "manageEntity": {
    "action": "Update",
    "entityId": "399415777",
    "entityType": "User",
    "metadata": "{\"cid\":\"bagaaiera7f3gxhuaosrqciviaq64og6eyoefg5dtck6bc4vofjh4ddvvpyza\",\"data\":{\"events\":{},\"playlist_library\":{\"contents\":[{\"type\":\"playlist\",\"playlist_id\":4281}]}}}",
    "nonce": "0x171cbefb1b8565c4a14beeca7db4a988f043aaf3785e914713e3ee61e76ea229",
    "signature": "0xfe67fe5889ad20de82b8150e2378416331046161defbe2e06fe1bd0176f69e864bf728f8c5264b41403d6ee9f8e830815d5a453bbdae6f2f2d0a5a6b8750eba01b",
    "signer": "0xF54ACD9868e9906094BBEe9817413658a3Dd38A2",
    "userId": "399415777"
  }
}