{
  "manageEntity": {
    "action": "Update",
    "entityId": "399689337",
    "entityType": "User",
    "metadata": "{\"cid\":\"bagaaiera7f3gxhuaosrqciviaq64og6eyoefg5dtck6bc4vofjh4ddvvpyza\",\"data\":{\"events\":{},\"playlist_library\":{\"contents\":[{\"type\":\"playlist\",\"playlist_id\":4281}]}}}",
    "nonce": "0x281945659801d8b0160982f12505086decb11ecf16bc7037b6bde609c2d9ce31",
    "signature": "0xed189406d3374210921b32a925517fde510fb2f94f56caad542c97457a10c42625f109cd6e6a8c3f9cbc54152684e3353ce6202b310241cf717b04865200b4861c",
    "signer": "0x4E683ed70DcfbA9b223E24954Fc9c366C86a4228",
    "userId": "399689337"
  }
}