{
  "manageEntity": {
    "action": "Update",
    "entityId": "666778218",
    "entityType": "User",
    "metadata": "{\"cid\":\"bagaaiera7f3gxhuaosrqciviaq64og6eyoefg5dtck6bc4vofjh4ddvvpyza\",\"data\":{\"events\":{},\"playlist_library\":{\"contents\":[{\"type\":\"playlist\",\"playlist_id\":4281}]}}}",
    "nonce": "0x1bf56862847e835f5bbee1446bca937296136032bda7d0dea397a4e5f54f5e8a",
    "signature": "0xd78ff7397f2a94e82a1830592b29f0536d72bc5dea6c2b9536d175dbb9e4a0a14f23a68b2c4a2182c6c006ce596ab2e577ca36ad882eaf6f52c6a25c8349f8571b",
    "signer": "0x53C3BdEF9f9185911F6f87D50D38912A16E3BeBA",
    "userId": "666778218"
  }
}