Question regardind ID fiels in Orthanc

In the below JSON response retreived via /tools/find are the IDs highlighted in bold generated by Orthanc or by the modality ?

[
{
“ID”: “223a9e05-a3d1f44f-5b8d04f7-ad238a82-acb3fcc7”,
“IsStable”: true,
“LastUpdate”: “20180110T083702”,
“MainDicomTags”: {
“AccessionNumber”: “”,
“InstitutionName”: “Anon”,
“ReferringPhysicianName”: “”,
“RequestedProcedureDescription”: “neck_soft-tissue clinical libraries”,
“StudyDate”: “20170908”,
“StudyDescription”: “neck_soft-tissue^clinical libraries”,
“StudyID”: “2”,
“StudyInstanceUID”: “1.3.12.2.1107.5.2.31.30894.30000017090806543960900000010”,
“StudyTime”: “130042.390000”
},
“ParentPatient”: “cac89bd8-67b1fd5f-915d5867-e5a9b231-a31d2b9a”,
“PatientMainDicomTags”: {
“PatientBirthDate”: “19700907”,
“PatientID”: “Anon”,
“PatientName”: “Anon”,
“PatientSex”: “M”
},
“Series”: [
“71e00168-0a2d852c-7dca34f5-84c73c6b-e8ed4fb2”,
“89479294-835e82cf-483aea7d-e039851f-db994654”,
“9c78ed2f-7b1a61c9-6c778f03-f58a8a37-7dc0c7c7”,
“376527c5-86da08b4-328c4a8c-e260b1ee-fe676192”,
“be3a21cb-3cb1532b-24eafdc0-8cc4f601-203f6351”,
“92cf0454-8791d796-cff30226-0af010e3-f8770d45”,
“81664bf9-fff5dac1-a8da9252-b1b69fd5-12edba05”,
“73c94ab2-062a7803-5fbb3d65-bb02db08-99ec30f0”
],
“Type”: “Study”
}
]

By Orthanc. You can get more information below, but basically depending on if a study, series, instance, they are created by combinations of patient ID’s, study, series, SOP UID’s.

http://book.orthanc-server.com/faq/orthanc-ids.html

Thanks !!!