Observation system (200, 300, 500, 800), comprising: - at least one observation device (204, 304.1, 304.2, 504.1, 504.2, 804) comprising at least one observation unit (206, 306.1, 306.2) configured to observe at least one observation object in accordance with at least one first instruction data set, and - at least one access control arrangement (201, 301) configured to control access to the observation device (204, 304.1, 304.2, 504.1, 504.2, 804) by at least one access entity (230, 330, 830), - wherein the access control arrangement (201, 301) comprises: - at least one first peer-to-peer module (226, 326.1, 326.2) assigned to the observation device (204, 304.1, 304.2, 504.1, 504.2, 804) and configured to forward at least one first instruction data set to the observation unit (206, 306.1, 306.2), - at least one peer-to-peer application (224, 324, 424, 824) of at least one peer-to-peer network (222, 322, 522), - wherein the peer-to-peer application (224, 324, 424, 824) is configured to control the access to the observation device (204, 304.1, 304.2, 504.1, 504.2, 804) by allowing the access entity (230, 330, 830) to cause the provision of at least one first instruction data set to the first peer-to-peer module (226, 326.1, 326.2), characterized in that - the peer-to-peer application (224, 324, 424, 824) is configured to generate at least one observation access transaction agreement about an access action to the observation device (204, 304.1, 304.2, 504.1, 504.2, 804) by the access entity (230, 330, 830), and - wherein the peer-to-peer application (224, 324, 424, 824) is configured to store the generated observation access transaction agreement. - at least one observation device (204, 304.1, 304.2, 504.1, 504.2, 804) comprising at least one observation unit (206, 306.1, 306.2) configured to observe at least one observation object in accordance with at least one first instruction data set, and - at least one access control arrangement (201, 301) configured to control access to the observation device (204, 304.1, 304.2, 504.1, 504.2, 804) by at least one access entity (230, 330, 830), - wherein the access control arrangement (201, 301) comprises: - at least one first peer-to-peer module (226, 326.1, 326.2) assigned to the observation device (204, 304.1, 304.2, 504.1, 504.2, 804) and configured to forward at least one first instruction data set to the observation unit (206, 306.1, 306.2), - at least one peer-to-peer application (224, 324, 424, 824) of at least one peer-to-peer network (222, 322, 522), - wherein the peer-to-peer application (224, 324, 424, 824) is configured to control the access to the observation device (204, 304.1, 304.2, 504.1, 504.2, 804) by allowing the access entity (230, 330, 830) to cause the provision of at least one first instruction data set to the first peer-to-peer module (226, 326.1, 326.2), characterized in that - at least one first peer-to-peer module (226, 326.1, 326.2) assigned to the observation device (204, 304.1, 304.2, 504.1, 504.2, 804) and configured to forward at least one first instruction data set to the observation unit (206, 306.1, 306.2), - at least one peer-to-peer application (224, 324, 424, 824) of at least one peer-to-peer network (222, 322, 522), - wherein the peer-to-peer application (224, 324, 424, 824) is configured to control the access to the observation device (204, 304.1, 304.2, 504.1, 504.2, 804) by allowing the access entity (230, 330, 830) to cause the provision of at least one first instruction data set to the first peer-to-peer module (226, 326.1, 326.2), - the peer-to-peer application (224, 324, 424, 824) is configured to generate at least one observation access transaction agreement about an access action to the observation device (204, 304.1, 304.2, 504.1, 504.2, 804) by the access entity (230, 330, 830), and - wherein the peer-to-peer application (224, 324, 424, 824) is configured to store the generated observation access transaction agreement.