Exhibit 13.39

If you have trouble viewing this email v i ew it in y:our browser. IIBlockstack June 2019 Blockstack Summit 2019 The 4th annual Blockstack Summit will be held on October 23rd, 2019 in San Francisco. This special one day event will touch on the " Next Evolution of Computing" and feature speakers including Naval Ravikant (Angellist), Neal Stephenson (New York Times bestselling author of Snow Crash and most recently, Fall), Dave Morin (former Co-Founder & CEO of Path and Founder of Slow Ventures), Elizabeth Stark (Co-Founder & CEO, Lightning Labs), Muneeb Ali (Co-Founder & CEO, Blockstack PBC), and more. ---> Announcement N eal Stephenson Na v al Rav ikant Elizabeth Stark Dav e Morin General Pre-Registration Is Open In April 2019, Blockstack Token LLC publicly filed an offering statement with the SEC to conduct a token offering using the Regulation A+ framework. Upon qualification, the offering is expected to be the first SEC-qualified token offering of its kind. Although the SEC has not yet qualified the offering statement you may now complete pre-registration as a part of the "testing-the-waters" phase of the planned sale of Stacks tokens. Pre-registering now helps us gauge interest and also verifies your identity, making it easy to complete your purchase if and when the sale is qualified. Completion of pre-registration does not complete the purchase of Stacks tokens and are you are not obligated to purchase the amount of Stacks tokens you indicate during pre-registration, or any Stacks tokens at all. If you already completed the voucher registration, you don' t need to go through the general pre-registration. Blockstack Whitepaper 2.0 We're pleased to share the Blockstack whitepaper 2.0 which builds on two years of R&D work, peer­ reviewed research, and presents a more detailed specification of our technology. The Blockstack whitepaper 2.0 updates the technical architecture and presents two new components: (a) the design of the Stacks blockchain and consensus mechanism, and (b) a new smart contract language that optimizes for predictability and security. ---> More Available in Chinese with more languages to come Building The Can' t Be Evil Contest ends on June 30th. Over $15,000 and more is ready to be won by developers building Blockstack apps --->Register Apps That Can•t Be Evil Technical Updates May-June • Released Stacks wallet v3.0 with ability to transact without a hardware wallet. ---> More • Released Blockstack Browser v0.36.2 beta ---> More • Developer tools releases, see change logs for details: o Release blockstack.js v19.2.0 ---> More o Released Android SDK v0.4.6 ---> More ---> Whitepaper 2.0 ---> Pre-Register --->Register

o Released iOS SDK v0.6.0 ---> More April-May • Released Blockstack Browser v0.36.1with a new home page and several bug fixes. ---> More • The foundational layer of the Stacks peer network as described in 51 P-003 was implemented ---> More • The first implementation of the Stacks smart contract Virtual Machine was merged ---> More • Developer tools releases, see change logs for details: o Released blockstack.js v19.1.0. --->More o Released Gaia v2.5.3 --->More o Released Android SDK v0.4.5 ---> More Highlighted Upcoming Events • June 21: Fireside Chat with Coinlist, Zavain Dar of Lux Capital will moderate this open discussion with Muneeb Ali (CEO, Blockstack PBC) and Brittany Laughlin (Head of Investor Relations, Blockstack PBC). • June 22-24: ZCon, annual privacy conference. Jude Nelson (Biockstack PBC) will represent Blockstack at the event in Croatia. • June 25-26: Bitcoin 2019, a peer-to-peer conference. Xan Ditkoff (Biockstack PBC) will be judging the hackathon in San Francisco. • July 18-19: JSCamp, a two-day conference covering JavaScript & modern web tech. Matt Little (Biockstack PBC) will be at the event in Barcelona. • August 19: Web3 Summit, a single rallying call: to facilitate a fully functional and user-friendly decentralized web. Mark Hendrickson (Biockstack PBC) will represent Blockstack at the event in Berlin. Reading List Stacks Wallet v3.0.0: Send/Receive Stacks Securely The new Stacks Wallet (v3.0.0) is available. If you're using the previous version, it's time to upgrade! --->Read More Encrypted Email Service Launches on Blockstack An encrypted email service that uses Blockstack IDs is hoping to make online privacy tools more accessible, especially in the Middle East. ---> More on Coindesk The Stacks Podcast: Ari Paul Listen to Ari Paul-the cryptocurrency investor & co­ founder of BlockTower Capital and Muneeb Ali, CEO of Blockstack PBC, discuss scalability and more. ---> Listen Now We're Hiring! Engineering Design&Product Head of Recruiting I Senior Recruiter Full Stack Engineer App.co Product Lead NewYork,NYorRemote Design&Product Lead Brand Designer Operations Senior Accountant Product Marketer Warning about Phishing Attacks Please be advi sed that Stacks tokens will be sold only upon qualification by the SEC, and the tokens do not currently trade on any exchange. Official announcement of SEC approval and sale will be through stack stoken.com or other official Blockstack communication channels. Potential investors should be cautious of phishing attacks and false information about our offering from unauthorized parties Rule 255 Legend This communication may be deemed "testing the waters" material under Regulation A under the Securities It':: ;., ;,.e., n( bl 1 nn On ?., :; n ,:.g:in : ::tne?n="A:,. et Y";e to ---> Full Events Calendar ---> More on the Forum

111<.41H"' <.411 V11 ...... 1111 '""'VIII ..... ,"''-" I IV' <.4110 VI "I"" tJ""VtJI"" nil'-' IIIUIV<A'"" <All 111'""1"""'' 111111W"""''"I 0 <AIIU "1<.4' Vll ...... llll might not be made under Regulation A. We will only be able to make sales after the Securities and Exchange Commission (SEC) has qualified the offering statement that we have filed with the SEC. The information in that offering statement will be more complete than the information we are providing now, and could differ in important ways. You must read the documents filed with the SEC before investing. No money or other consideration is being solicited , and if sent in response, will not be accepted. No offer to buy the securities can be accepted and no part of the purchase price can be received until the offering statement filed by the company with the SEC has been qualified by the SEC. Any such offer may be withdrawn or revoked, without obligation or commitment of any kind, at any time before notice of acceptance given after the date of qualification An indication of interest involves no obligation or commitment of any kind. Any person interested in investing in any offering of Stacks Tokens should review our disclosures and the publicly filed offering statement and the preliminary offering circular that is part of that offering statement at stackstoken.com Blockstack is not registered, licensed or supervised as a broker dealer or investment adviser by the Securities and Exchange Commission (SEC), the Financial Industry Regulatory Authority (FINRA) or any other financial regulatory authority or licensed to provide any financial advice or services Join us Online Copyright 10 2018 Blockstack, All rights reserved. You are receiving this email because you opted in at our website. 's mailingaddressis: PO Box 319 lafayette St. #136,New York, NY, 10012, United States