As I see it, consciousness is the source. Brains are like a receiving and transmitting device and are needed as part of the nervous system and the body, but aren't the actual source of awareness itself. They are more of a concurrent manifestation of biology on this plane of existence.
AI will become quite advanced in the future, but machines will never be truly conscious. "Sentient robots" are probably impossible because consciousnss/awareness isn't derived from anything in the physical domain. I do realize I'm taking a philosophical position with that statement so not everyone will agree.
The blockchain is great for what it does, but I don't think it is necessarily the right tool for AI.
Awareness, or at least self awareness is a phenomena of the brain(Physical) and it's not just humans that exhibit it, there are already some species of animals that are self aware such as Chimpanzees, dolphins, etc. There is no metaphysical domain that we know of, all our attributes, our thoughts, our "self" stems from the physical brain, which is why things like injuries to the brain may result in personality changes, depression, mental retardation, losing some abilities such as speech, coordination etc.
You only need look to love to know there is something beyond the physical. some would say that is ultimately attributable to brain chemistry (material reductionism) but I would not.
With all due respect, the fact you would not reveals you're not actually interested in a factual explanation but need to be coddled by a romantic ideal. Everything you are, we are, is at its core electrical pulses and chemistry. Every state of being you are is fueled, caused, and directed by chemical interaction. Your feelings *are* chemicals. It's a variety of chemical interactions causing the end results of feelings, desires, thoughts, movements, actions.
You cannot, with all respect for reality and common sense, deny that if one were to have the brain removed from the skull, the individual ceases to live. The brain is the control center for you and bottom line, we as reproductive animals are only here to make more reproductive animals. All our sexual behaviors are not caused by mental illness or psychological issues but by pure chemistry. The chemistry of hormones and neurotransmitters and a cocktail of chemicals *cause* us to feel sexually aroused, *cause* us to attach desire toward one person, *cause* us to feel nothing at all for someone else, *cause* us to desire intercourse...and most pathetic of all, everyone calling females whores and sluts, or giving people a hard time about cheating - it's all chemically induced. The menstrual cycle in females is the entire clock and cause of a woman's sexual nature for better or worse, operating monthly to impel her to desire sex for reproduction.
It's all chemistry all the time.
Sexual desire has nothing at all to do with psychology, emotion, ideals, morality or values. It's built into each of us to reproduce the species.
Our bodies, our beings have no special cosmic purpose here and it's narcissistic and egoism that we believe this is why we're all here.
Our bodies are vehicles to transport sex cells and move them from one to another to make more bodies to transport sex cells and it's all operated and caused by brain chemistry.
Love is a chemical reaction. Sex and love are two different things. It's not cosmic, we're not here to be rock stars and celebrities. There's no such thing as a soul mate, there's no one person "put here" just for us. Cheating is only a social ill but Mother Nature built us for multiple mates (which is why cheating is inevitable if you tie up somewhere "for the duration). We do not mate for life, it's antithetical to our entire existence. We were all "born" to reproduce. Outside of that, sex is recreational choice. We are here to reproduce this species and if we adapt well the changing conditions we survive. If not, we're terminated.
It's all chemistry all the time...and this reality withstands all romantic notions from those too frail to face it.
Embracing reality as it is and not as you wish it to be is the first step toward living a productive, quality, intellectually, and psychologically sound existence.