{
  "manageEntity": {
    "action": "Update",
    "entityId": "552753858",
    "entityType": "User",
    "metadata": "{\"cid\":\"bagaaiera7f3gxhuaosrqciviaq64og6eyoefg5dtck6bc4vofjh4ddvvpyza\",\"data\":{\"events\":{},\"playlist_library\":{\"contents\":[{\"type\":\"playlist\",\"playlist_id\":4281}]}}}",
    "nonce": "0x1b595e870953c391a5623e852bc1adcbb71278768396a9fb83a7a225b8ee8710",
    "signature": "0x4137a9858fb8470d2d4b8235b5349349bfc4a569fe2649aea94bd56144c058762bbf8779ded0a288ec61328de609ee4e1d89ca1ece62d242afc4f89cd83d18841c",
    "signer": "0x8E3A4E1A0d1Aa7628E0FDbc872062F921A449403",
    "userId": "552753858"
  }
}