Quote from: princesultan1 on December 20, 2014, 12:47:13 PM

http://ledracapital....blockchain-list

The Mega-Master Blockchain* List
Draft / Work-in-Progress / Not totally consistent in its categorization
This "Twitter-sourced" list (started March 11, 2014) is an open/rough attempt to brainstorm what asset registries, keys or related items theoretically could be implemented in a blockchain model. They may or may not be good ideas to do in a blockchain or might be good in certain circumstances or others, but that is not this exercise - this is a brainstorming exercise.

* Either the bitcoin blockchain or alternative blockchains

What is missing? Tweet it to: @polemitis
I. Financial Instruments, Records and Models
Currency
Private equities
Public equities
Bonds
Derivatives (futures, forwards, swaps, options and more complex variations)
Voting rights associated with any of the above
Commodities
Spending records
Trading records
Mortgage / loan records
Servicing records
Crowd-funding
Micro-finance
Micro-charity

II. Public Records

Land titles
Vehicle registries
Business license
Business incorporation / dissolution records
Business ownership records
Regulatory records
Criminal records
Passports
Birth certificates
Death certificates
Voter IDs
Voting
Health / Safety Inspections
Building permits
Gun permits
Forensic evidence
Court records
Voting records
Non-profit records
Government/non-profit accounting/transparency

III. Private Records

Contracts
Signatures
Wills
Trusts
Escrows
GPS trails (personal)

IV. Other Semi-Public Records

Degree
Certifications
Learning Outcomes
Grades
HR records (salary, performance reviews, accomplishment)
Medical records
Accounting records
Business transaction records
Genome data
GPS trails (institutional)
Delivery records
Arbitration

V. Physical Asset Keys

Home / apartment keys
Vacation home / timeshare keys
Hotel room keys
Car keys
Rental car keys
Leased cars keys
Locker keys
Safety deposit box keys
Package delivery (split key between delivery firm and receiver)
Betting records
Fantasy sports records (!)

VI. Intangibles (?)

Coupons
Vouchers
Reservations (restaurants, hotels, queues, etc)
Movie tickets
Patents
Copyrights
Trademarks
Software licenses
Videogame licenses
Music/movie/book licenses (DRM)
Domain names
Online identities
Proof of authorship / Proof of prior art

VI. Other

Documentary records (photos, audio, video)
Data records (sports scores, temperature, etc)
Sim Cards
GPS network identity
Gun unlock codes
Weapons unlock codes
Nuclear launch codes (!)
Spam control (micro-payments for posting)

Could a 51% attack mess with many of these records? For example, changing the ownership of licenses, Trademarks, property, etc.
Perhaps sidechains will be useful, since the BTC network is secure, but it seems like almost all alternative chains would have little true security.