In 'Brainwave Wedding Lab', artists Lancel/Maat, together with audiences, investigate future forms of marriage in a technological society. Together with Baltan Laboratories they organise workshops and lectures. The highlight of the brainwave Wedding Lab is to launch a new wedding ritual for a sustainable social future, based on a blockchain Wedding Ring. Can we create a new form of wedding ritual, in which technology is included as partner for the wedding vow and contract? Can the EEG data of a wedding kiss be a key to the block chain contract? In the Blockchain Wedding Ring ritual, the audience can experiment with a new personal form of marriage. Beloved ones can shape an inclusive wedding pledge that is valid for a variable period, in different gender combinations, between two or more people. The wedding contract they sign is cryptographically stored in a smart blockchain system, no longer determined by restrictive social mores and local laws and legal aspects. The wedding contract is only visible by means of a secret crypto-code. This secret code is made by the marriage partners themselves, based on their brain activity during the wedding kiss. For this, the artists developed a special Brain Computer Interface that translates the kiss into a secret blockchain Code, which is then printed 3d as a wedding ring. In the new wedding ritual, lovers are sliding the blockchain Wedding Ring code around the finger, as a tangible reminder of confidence during their kiss, forever, infinitely, in data.