{
  "manageEntity": {
    "action": "Update",
    "entityId": "507747752",
    "entityType": "User",
    "metadata": "{\"cid\":\"bagaaiera7f3gxhuaosrqciviaq64og6eyoefg5dtck6bc4vofjh4ddvvpyza\",\"data\":{\"events\":{},\"playlist_library\":{\"contents\":[{\"type\":\"playlist\",\"playlist_id\":4281}]}}}",
    "nonce": "0x55c452f16fabc3b4f6fdaa2c2a0cabc6250bb691a76d1653f3790412c97873a2",
    "signature": "0xb5bd831f314f2041d1a82e884b9504d16ee078655862074d18a93e47fbeda34f2199a17647e40c58534d0f0bb9e2143edef65f27fef2bbca13041eefbcdd72e21b",
    "signer": "0xC38A1c94E04EE9e85ebBC7acD3b5566D53fFC4ab",
    "userId": "507747752"
  }
}