Can we still push metadata onto the bitcoin blockchain and if yes, How do we do it and how fast will the ownership of a particular element get transferred from one person to another.
You mean using OP_RETURN to push certain data/words onto the blockchain? Other then that, i'm not sure how much is possible/what you're referring to here..
Coloured coins? Never heard of that before..
Anyway, here's the guide i found where you can apparently push certain words onto the blockchain ( although it being Hex),
https://bitcoin.stackexchange.com/questions/25224/what-is-a-step-by-step-way-to-insert-data-in-op-return/Which looks quite interesting, but i doubt that this is what you're referring to.