Agenda: 1. Question: naming: cheque, magic link, Attestation? Attestation: a signed message where the data object (signedInfo) is attested by the signer. Compared with SSL Certificate: only the subject is attested to. e.g. SignedInfo in an exaple certificate: rdn (subject) is cn=www.alphwallet.com cn: www.aphawallet.com o: AlphaWallet Pty Ltd c: AU st: NSW l: Sydney ou: Mobile Appp email: email@example.com Cheque: a signed message that containes a promise from the signer, etiher a promise-to-pay, or promise-to-deliver, with conditions. MagicLink: is an encoding method. (to encode a cheque or an attestation) 2. Component list for Alice-send-ether-to-Bob-by-identifier story. First project: Bob: cards: - signing request card - attestation token card - attestation prove/login card websites: - attestor (http://attestation.id) - alphawallet (http://alphawallet.com) TokenScript - the tokenscript file for "Email Attestation" Second Project Alice: Cards: - Cheque creation card (promise to pay 1 ether -> share magic link) - Activity for the Cheque (might have action like cancel the cheque) - Redeem card (for the cheque to run on Bob's mobile) - Redeem Activity Smart Contract: - A smart contract that can redeem the cheque (check protocol) (Downside: she can't canel the cheque on another device) Boon asked: are attestations backed up? some are (cheques are, attestations to FIFA ticket are) some are not (email identifier attestation is not) Reason for some keys not backedup: You need to think from the perspective of an adversary. Let's not make this too long but let's say: 1. an adversary acquire an email attestation on his email address. This attestation and owner is legit at this moment. Let's say the email address has value, i.e. it's one that ends with .edu (which allows you to get educational rebate or discount). 2. he copies and pass the key and the attestation to 100 people so that they can login to a website with educational rebate option. 3. at this point, the website doesn't know for sure if the visitor is the adversary or one of the 100 buyers of the copies. ------------ 3. Review Sangalli problem (we have no solution so far).