Letter from Rosenberg Rich Baker Berman & Company to the Securities and Exchange Commission, dated November 15, 2017

Exhibit 10.4

November 15, 2017

Securities and Exchange Commission

100 F Street, NE

Washington, D.C. 20549

Re: NXChain Inc.

We have read the statements included under Item 4.01 of the Form 8-K of NXChain Inc. regarding the change in registrant’s certifying accountants. We agree with such statements made regarding our firm. We have no basis to agree or disagree with other statements under Item 4.01.

Yours truly,

/s/ Rosenberg Rich baker Berman & Company

AMERICAN INSTITUTE OF CERTIFIED PUBLIC ACCOUNTANTS • CENTER FOR AUDIT QUALITY • PRIVATE COMPANIES PRACTICE SECTION • PRIME GLOBAL • REGISTERED WITH THE PUBLIC COMPANY ACCOUNTING OVERSIGHT BOARD