2AF3K-BK003Block Bitkey

Block, Inc. Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: February 20, 2026 Ref: Attestation Statements Part 2.911(d)(7) Filing FCC ID: 2AF3K-BK003 Block, Inc., certifies that, as of the date of the filing of the application, Block, Inc. is our designated U.S. agent for service of process for the above referenced FCC ID. Block, Inc., accepts to maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any Commission-related proceeding involving the equipment. Block, Inc. accepts, as of the date of the filing of the application, the obligation of the designated U.S. agent for service of process for the above referenced FCC ID. Designated U.S. Agent Information: Name: Block, Inc. FRN: 0024921181 Address: 1955 Broadway, Suite 600, Oakland, CA 94612, United States Contact Person: Yuchan Lu Telephone number: 415-375-3176 Email: [email protected] Sincerely, Yuchan Lu Hardware Compliance Program Manager Block, Inc. 2/20/2026 block.xyz.com | |

Block, Inc. Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 2/20/2026 Ref: Attestation Statements Part 2.911(d)(5)(ii) Filing FCC ID: 2AF3K-BK003 Block, Inc. (“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List (as a specifically named entity or any of its subsidiaries or affiliates) as an entity producing “covered” equipment. Sincerely, Yuchan Lu Hardware Compliance Program Manager Block, Inc. 2/20/2026 block.xyz.com | |

Block, Inc. Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 2/20/2026 Ref: Attestation Statements Part 2.911(d)(5)(i) Filing FCC ID: 2AF3K-BK003 Block, Inc. (“the applicant”) certifies that the equipment for which authorization is sought is not “covered” equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. Block, Inc. (“the applicant”) certifies that the equipment for which authorization is sought does not include cybersecurity or anti-virus software produced or provided by Kaspersky Lab, Inc. or any of its successors and assignees, including equipment with integrated Kaspersky Lab, Inc. (or any of its successors and assignees) cybersecurity or anti-virus software pursuant to DA-24-886 and KDB 986446 D01 Covered Equipment Guidance section B(2a). ☑ Device is inherently compliant based on hardware limitations or software controls. or ☐ A Software Bill of Materials (SBOM) is provided to the TCB for review, and ☐ The end-user or third parties cannot install additional software on this device. Sincerely, Yuchan Lu Hardware Compliance Program Manager Block, Inc. 2/20/2026 block.xyz.com | |

Page 1 of 1 Request for Confidentiality Date: March 2, 2026 Subject: Confidentiality Request for: FCC ID: 2AF3K-BK003 IC: 21827-BK003 Pursuant to FCC 47 CFR 0.457(d) and 0.459 and IC RSP-100, Section 12.4, the applicant requests that a part of the subject FCC application be held confidential. Type of Confidentiality Requested Exhibit ☐ Short Term ☒ Permanent ☐ Not Provided Block Diagrams ☒ Short Term ☐ Not Provided External Photos ☒ Short Term ☐ Permanent ☐ Not Provided Internal Photos ☐ Short Term ☒ Permanent ☐ Not Provided Operation Description/Theory of Operation ☐ Short Term ☐ Permanent ☒ Not Provided Parts List & Placement/BOM ☐ Short Term ☐ Permanent ☒ Not Provided Tune-Up Procedure ☐ Short Term ☒ Permanent ☐ Not Provided Schematics ☒ Short Term ☐ Not Provided Test Setup Photos ☒ Short Term ☐ Permanent ☐ Not Provided User’s Manual The above-mentioned company has spent substantial effort in developing this product and it is one of the first of its kind in industry. Having the subject information easily available to "competition" would negate the advantage they have achieved by developing this product. Not protecting the details of the design will result in financial hardship. Permanent Confidentiality: The applicant requests the exhibits listed above as permanently confidential be permanently withheld from public review due to materials that contain trade secrets and proprietary information not customarily released to the public. Short-Term Confidentiality (if applicable): The applicant requests the exhibits selected above as short term confidential be withheld from public view for a period of 180 days from the date of the Grant of Equipment Authorization and prior to marketing. This is to avoid premature release of sensitive information prior to marketing or release of the product to the public. Applicant is also aware that they are responsible to notify Timco in the event information regarding the product or the product is made available to the public before the requested period has expired. Timco will then release the documents listed above for public disclosure pursuant to FCC Public Notice DA 04- 1705. Sincerely, By: __________________________ Fox Lane, EMC Test Engineer, NCEE Labs

Block, Inc. February 20, 2026 Federal Communications Commission Equip Approval Services Post Office Box 358315 Pittsburgh, Pennsylvania 15215-5315 To Whom It May Concern: Pursuant to 47 CFR 2.911, Block, Inc. has authorized Fox Lane, Karthik Vepuri, and Blake Winter of the Nebraska Center for Excellence in Electronics (NCEE Labs), at 4740 Discovery Drive, Lincoln, NE 68521 to act on Block, Inc. behalf for the sole and express purpose of processing applications to the Federal Communication Commission (FCC) for equipment FCC authorization. This authorization is limited to FCC ID: 2AF3K-BK003. Consistent with the foregoing, Fox Lane, Karthik Vepuri, and Blake Winter are authorized to the following: 1) Sign Form 731 2) Sign letters of application 3) Request confidentiality 4) Exchange data and information with the FCC, and authorized TCBs on behalf of Block, Inc. . This authorization is not assignable to others beyond Fox Lane, Karthik Vepuri, and Blake Winter. No party to this application is subject to a denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C 862. We also declare that the information provided to the FCC is true and correct to the best of our knowledge (47 CFR 2.911(d)) and we have been informed of the grantee responsibilities (47 CFR 2.909) with regard to certified equipment. This authorization expires February 20, 2027. Sincerely, Yuchan Lu Hardware Compliance Program Manager Block, Inc. 2/20/2026 block.xyz.com | |

Re: Grantee Contact Signature Authorization To Whom It May Concern: I, Gavin Demonte, as the Grantee Contact of Block, Inc., hereby authorize the following personnel of Block, Inc. to sign documents on behalf of the company for equipment approval under FCC grantee code 2AF3K and ISED company number 21827. ● Simon Ma ● Yuchan Lu Gavin Demonte Hardware Regulatory & Compliance Lead Block, Inc. Date and Place of Issue: 01/12/2026, Toronto, Canada block.xyz.com | |

VIEW REGULATORY INFORMATION ON DEVICE To view regulatory information for Bitkey, tap the 3-dot menu at the top of the Bitkey home screen and select Regulatory. Block, Inc. Bitkey Model Number: BK003 United States Block, Inc., 1955 Broadway, Suite 600, Oakland, CA 94612, United States. FCC ID: 2AF3K-BK003 Canada CAN ICES-003(B)/NMB-003(B) IC: 21827-BK003 • Label will be accessible without any special codes accessories or permissions besides a possible fingerprint which is a standard security protection for the end user. • Text print will be clearly legible without the use of magnification • Device label cannot be modified by 3 rd parties and will be set to be unchangeable/locked from manufacturing. The label will be able to be viewed locally on the device under the intended user’s control • There will be a temporary label provided in the packaging for temporary use which will included FCC ID/ Model/ and eCFR 15.19 statements

The Nebraska Center for Excellence in Electronics (NCEE) authorizes the above-named company to reproduce this report provided it is reproduced in its entirety for use by the company’s employees only. Any use that a third party makes of this report, or any reliance on or decisions made based on it, are the responsibility of such third parties. NCEE accepts no responsibility for damages, if any, suffered by any third party as a result of decisions made or actions based on this report. This report applies only to the items tested. RF Exposure Evaluation Report Client: Block, Inc. Address: 1955 Broadway, Suite 600, Oakland, CA 94612 United States Model: Bitkey Test Report No.: RFE20251010-70-M1 Rev. 0 Approved By: __________________ Fox Lane, EMC Test Engineer Date: March 4, 2026 Total Pages: 9 NCEE Labs Report Number: RFE20251010-70-M1 Rev. 0 Test Report Prepared for Block, Inc. The Nebraska Center for Excellence in Electronics 4740 Discovery Drive Lincoln, NE 68521 Page 2 of 9 Revision Page Rev. No. Date Description Original 4 March 2026 Issued by FLane Prepared by FLane NCEE Labs Report Number: RFE20251010-70-M1 Rev. 0 Test Report Prepared for Block, Inc. The Nebraska Center for Excellence in Electronics 4740 Discovery Drive Lincoln, NE 68521 Page 3 of 9 1 Regulatory Requirements: FCC Part 1.1310, 2.1091, 2.1093 KDB 447498 D01 RSS-102, Issue 6 Summary: The purpose of this report is to evaluate the EUT’s transmitter for exemption from routine SAR testing. EUT: Model: Bitkey FCC ID: 2AF3K-BK003 IC: 21827-BK003 HVIN: BK003 MPE Lab Nebraska Center for Excellence in Electronics MPE Labs FCC Cab Designation: US1060 MPE Labs ISED Cab Designation: US0177 NCEE Labs Report Number: RFE20251010-70-M1 Rev. 0 Test Report Prepared for Block, Inc. The Nebraska Center for Excellence in Electronics 4740 Discovery Drive Lincoln, NE 68521 Page 4 of 9 2 FCC FCC Limits, Part 1.1310 Frequency range (MHz) Electric field strength (V/m) Magnetic field strength (A/m) Power density (mW/cm 2 ) Averaging time (minutes) (A) Limits for Occupational/Controlled Exposure 0.3-3.0 614 1.63 *100 6 3.0-30 1842/f 4.89/f *900/f 2 6 30-300 61.4 0.163 1.0 6 300-1,500 f/300 6 1,500-100,000 5 6 (B) Limits for General Population/Uncontrolled Exposure 0.3-1.34 614 1.63 *100 30 1.34-30 824/f 2.19/f *180/f 2 30 30-300 27.5 0.073 0.2 30 300-1,500 f/1500 30 1,500-100,000 1.0 30 NCEE Labs Report Number: RFE20251010-70-M1 Rev. 0 Test Report Prepared for Block, Inc. The Nebraska Center for Excellence in Electronics 4740 Discovery Drive Lincoln, NE 68521 Page 5 of 9 Occupational/Controlled (10-g) Extremity SAR Eval General Population/uncontrolled X (1-g) Body SAR Eval X FCC Power Density Calculations Frequency EIRP (P) EIRP +10% for Tolerance (P10) SAR Exemption Calc (SAC) Sar Exemption Limit (SAL) % of limit Result GHz mW mW mW/cm^2 Numeric % 13.5600 0 0.0 0.0 3.0 0.0 PASS Distance (d) 5 mm S = (P10 / d)*sqrt(f) – used to calculate exposure at "d" cm f = Frequency (GHz) S = power density (mW/cm^2) P = transmitter conducted power (in mW) d = distance to radiation center (mm) Results: Complies Note: Device power significantly below 1mW (less than -20dBm) and shows exemption from SAR testing EIRP values in mW were multiplied by 1.1 to account for a 10% tolerance. NCEE Labs Report Number: RFE20251010-70-M1 Rev. 0 Test Report Prepared for Block, Inc. The Nebraska Center for Excellence in Electronics 4740 Discovery Drive Lincoln, NE 68521 Page 6 of 9 3 ISED RSS 102, Issue 6, Section 6.4 (for distances less than 20cm) NCEE Labs Report Number: RFE20251010-70-M1 Rev. 0 Test Report Prepared for Block, Inc. The Nebraska Center for Excellence in Electronics 4740 Discovery Drive Lincoln, NE 68521 Page 7 of 9 RSS 102, Issue 6, Section 6.6 (for distances 20cm or greater) NCEE Labs Report Number: RFE20251010-70-M1 Rev. 0 Test Report Prepared for Block, Inc. The Nebraska Center for Excellence in Electronics 4740 Discovery Drive Lincoln, NE 68521 Page 8 of 9 Occupational/Controlled ☐ General Population/uncontrolled ☒ ISED Power Density Calculations Frequency EIRP Antenna Gain Peak Power EIRP Peak Power EIRP +10% for Tolerance Power Density Limit at (d) % of limit Result MHz mW numerical mW mW mW/cm^2 mW % 13.5600 0.001 1.00 0.00 0.00 0.000 1.00 0.000 PASS Antenna Gain set to 1.00 because power measurements were performed with radiated method Distance (d) 5 mm S = (P x G)/(4 x π x d^2) – used to calculate exposure at "d" cm EIRP = P x G, measured as field strength d = √(S/(P x G) x 4 X π) – used to calculate minimum distance to meet limits S = power density (mW/cm^2) P = transmitter conducted power (in mW) G = antenna numeric gain (Numerical) d = distance to radiation center (cm) Note: Device power significantly below 1mW (less than -20dBm) and shows exemption from SAR testing EIRP values in mW were multiplied by 1.1 to account for a 10% tolerance. Result: The EUT was found to be exempt from routine SAR testing and COMPLIANT with FCC and ISED RF exposure requirements. NCEE Labs Report Number: RFE20251010-70-M1 Rev. 0 Test Report Prepared for Block, Inc. The Nebraska Center for Excellence in Electronics 4740 Discovery Drive Lincoln, NE 68521 Page 9 of 9 4 Result Device complies with all exposure limits listed in this report. REPORT END

The Nebraska Center for Excellence in Electronics (NCEE) authorizes the above named company to reproduce this report provided it is reproduced in its entirety for use by the company’s employees only. Any use that a third party makes of this report, or any reliance on or decisions made based on it, are the responsibility of such third parties. NCEE accepts no responsibility for damages, if any, suffered by any third party as a result of decisions made or actions based on this report. This report applies only to the items tested. FCC/ISED DXX Part 15.225 Test Report Prepared for: Block, Inc. Address: 1955 Broadway, Suite 600, Oakland, CA 94612 United States Model Name: Bitkey Model Number: BK003 Test Report No: R20251010-70-E1A Approved By: __________________ Fox Lane, EMC Test Engineer DATE: 26 February 2026 Total Pages: 20 Report Number: R20251010-70-E1 Rev A Prepared for: Block, Inc. The Nebraska Center for Excellence in Electronics 4740 Discovery Drive Lincoln, NE 68521 Page 2 of 20 Revision Page Rev. No. Date Description 0 26 February 2026 Issued by FLane Prepared by ESchmidt A 26 February 2026 Added standard sections to test sections – FL Report Number: R20251010-70-E1 Rev A Prepared for: Block, Inc. The Nebraska Center for Excellence in Electronics 4740 Discovery Drive Lincoln, NE 68521 Page 3 of 20 TABLE OF CONTENTS 1 Summary of Test Results ............................................................................................................ 4 1.1 Emissions Test Results .......................................................................................................... 4 2 EUT Description ............................................................................................................................ 5 2.1 Equipment under Test (EUT) ................................................................................................. 5 2.2 Laboratory Description ........................................................................................................... 5 2.3 EUT Setup .............................................................................................................................. 5 3 Test Results .................................................................................................................................. 6 3.1 Radiated Emissions, Band Width, Field Strength and Band edge ......................................... 6 3.2 Frequency Error ................................................................................................................... 12 3.3 Conducted AC Mains Emissions .......................................................................................... 14 APPEND IX A: SAMPLE C ALCU LATIO N ................................................................................. 17 APPEND IX B – MEASU REMENT U NC ER TAINT Y ............................................................... 19 REPORT END ...................................................................................................................................... 20 Report Number: R20251010-70-E1 Rev A Prepared for: Block, Inc. The Nebraska Center for Excellence in Electronics 4740 Discovery Drive Lincoln, NE 68521 Page 4 of 20 1 Summary of Test Results The worst-case measurements were reported in this report. Summary of test results presented in this report correspond to the following section(s): 1.1 Emissions Test Results The EUT was tested for compliance to: US CFR Title 47 FCC Part 15.225, 15.209, 15.207 RSS-Gen Issue 5 RSS-210 Issue 11 Table 1 – Emissions Test Results Emissions Tests Test Method and Limits Result Radiated Emissions FCC Part 15.225 (a), (b), (c), (d) FCC Part 15.209 RSS-Gen, Issue 5, 6.5, 6.13 RSS-210 Issue 11 B.6(a) Complies Conducted Emissions FCC Part 15.207 RSS-Gen, Issue 5, 8.8 Complies Band Edges FCC Part 15.225 (b) (c) RSS-210 Issue 11 B.6(a) Complies Frequency Error FCC 15.225(e) RSS-210 B.6(b) Complies Occupied Bandwidth RSS-Gen 6.7 Complies Report Number: R20251010-70-E1 Rev A Prepared for: Block, Inc. The Nebraska Center for Excellence in Electronics 4740 Discovery Drive Lincoln, NE 68521 Page 5 of 20 2 EUT Description 2.1 Equipment under Test (EUT) Table 2 – Equipment under Test (EUT) Model Name Bitkey Model Number BK003 FCC ID 2AF3K-BK003 IC 21827-BK003 EUT Received 6 February 2026 EUT Tested 9 February 2026 - 13 February 2026 Serial No. 604WS27101300057 Operating Band 13.553 – 13.567MHz Device Type ☐ GMSK ☐ GFSK ☐ BT BR ☐ BT EDR 2MB ☐ BT EDR 3MB ☐ 802.11x ☒ NFC Power Supply / Voltage Internal Battery / 5VDC Charger: Block Inc. Model SWJ3-01 (Representative Power Supply) 2.2 Laboratory Description All testing was performed at the following Facility: The Nebraska Center for Excellence in Electronics (NCEE Labs) 4740 Discovery Drive Lincoln, NE 68521 A2LA Certificate Number: 1953.01 FCC Accredited Test Site Designation No: US1060 FCC Lab Registration No: 134067 Industry Canada Test Site Registration No: 4294A NCC CAB Identification No: US0177 Environmental conditions varied slightly throughout the tests: Relative humidity of 28  4% Temperature of 22  3 C 2.3 EUT Setup The EUT was powered by 120 VAC / 60Hz (5 VDC Output) for all tests. It was programmed to run a continuous NFC transmission. Report Number: R20251010-70-E1 Rev A Prepared for: Block, Inc. The Nebraska Center for Excellence in Electronics 4740 Discovery Drive Lincoln, NE 68521 Page 6 of 20 3 Test Results 3.1 Radiated Emissions, Band Width, Field Strength and Band edge Test: FCC Part 15.225 (a), (b), (c), (d) FCC Part 15.209 RSS-Gen, Issue 5, 6.5, 6.13 RSS-210 Issue 11 B.6(a) RSS-Gen 6.7 Test Specifications: Class B Test Result: Complies 3.1.1 Test Description Radiated emissions measurements were made from 30MHz to 1GHz at a distance of 3m (Radiated Emissions) and 3m (Bandwidth, Field Strength and Band edges) inside a semi- anechoic chamber. The EUT was rotated 360°, the antenna height varied from 1-4 meters and both the vertical and horiz…

Text truncated - open the document above for the full version.