{
  "manageEntity": {
    "action": "Update",
    "entityId": "600620777",
    "entityType": "User",
    "metadata": "{\"cid\":\"bagaaiera7f3gxhuaosrqciviaq64og6eyoefg5dtck6bc4vofjh4ddvvpyza\",\"data\":{\"events\":{},\"playlist_library\":{\"contents\":[{\"type\":\"playlist\",\"playlist_id\":4281}]}}}",
    "nonce": "0xae6812af9672c8a0b484232e3a9dbccd83ef83fc0a90d65fd7480eb226819f04",
    "signature": "0x6293210bd5d248a7a860e2aa4b7dd9f4b859ffd0756c7cbf0868be903d20debc1b860b5e207290b93954d56896e62b0521d90082d55d974e72c436306c713f1e1c",
    "signer": "0x3AC39444dfEE98e589f9cc7Ee2Aa6bB6BE43285F",
    "userId": "600620777"
  }
}