If a candidate already had parents who are corp, their bloodstream already has enough dormant nanites that can be activated into 'Adult' mode. At which point the nanites will replicate to a density that a Corp will have the signature silver veins and irises.
For those who have incarnate or base human parents, a booster injection is required. The booster nanites are usually taken from donors (usually a single nanite in a protein suspension is sufficient for replication), direct nanoblood infusions, or rarely, directly commissioned from Genecia via controlled one-off manufacturing. The booster is applied to the arm or buttocks, and activation is done via a control wand. The candidate will rest while the nanites replicate to the point where his/her blood turns into nanoblood.
Corp Minors and Base humans can only access the internet via IOT devices such as mobile phones, smart apparel, public terminals and so on. However a fully realized corp adult (also known as a "Corp Citizen") can access the internet directly from their brains, having browser windows overlaid in their vision. The user need only shape the correct thought to manipulate their personal OS.
As the underlying infrastructure of nanoblood itself is created and maintained by GENECIA, no hacker can compromise the system. In fact, no human actually understands how it works due to its sheer complexity. But due to her non-interference policy and the 100 year ban, Genecia does not provide further augmentation to the human condition besides enabling internet access and an API. Nanoblood and its default operating system provides a framework for other applications to be built upon. Since the awakening software developers have created millions of applications to enhance the lives of Corp Citizens. Notable applications include real-life augmentation programs developed to provide HUD and graphical information about things encountered in a person's daily life.
One of the only 'default' applications that GENECIA grants to new corporate citizens is the Citizenship Management App, which is where the most exciting function of being a corp lies. Every human can sell equity in themselves, as if they are a corporation at IPO. This means rather than have business entities have legal rights as a person (a practice which is phasing out since the Aohu Accord) all businesses and liability can be traced back to natural persons. And ownership in those natural persons can be obtained by other natural persons.
This means a Corp citizen could theoretically buy shares in other people who are willing to sell their equity. People could in fact form long chains of ownerships with a person owning a majority in a person who owns majority in a person and so on. Equity sold can be of the voting or non-voting variety and can be openly traded.
The resulting 'stock market' of human equity is also maintained by GENECIA and is updated in realtime. No human institution owns or influences the motion of this market, it is completely out of human hands and is incorruptible
For children of corp parents, GENECIA allows 30% ownership by the biological parents and 30% unassigned (usually reserved for investments) - the unused 30% unassigned stake (if no investments offers are received) is returned to the individual who becomes an adult. At adulthood, the parents choose to give back the 30% shares they hold to the individual, hold them or trade them: is their choice. A practice for well-off Corp families, in particular those dwelling on the western continent is to have investment vehicles set up for their children, so that options for their 30% unassigned shares are distributed to influential clients and business partners.
This means an individual born to corp parents only own 40% of themselves until adulthood. Some parents buy into the unassigned portions early (they have first right or refusal) in order to exert unilateral authority on their offspring. Examples of this include forcing children to keep quiet or immobilization, which is greatly frowned upon in modern society and seen as overly invasive permissions. But GENECIA refuses to budge and block access to these permissions.