In The Unicode Standard, Kaithi script implementation is discussed in  Chapter 15 South and Central Asia-IV.

The Kaithi script was encoded in The Unicode Standard version 5.2. The script is encoded in the following block:

BlocksCharacter RangeAdded in Unicode VersionUnicode Chart
Kaithi 11080..110CF 5.2  U11080

A number of proposals for its inclusion were submitted to the Unicode Technical Committee and WG2:

2005-10-25 Proposal to Encode the Kaithi Script in Plane 1 of ISO/IEC 10646 — Anshuman Pandey ( L2/05-343)

2005-11-06 Towards an encoding of the Kaithi script in the SMP of the UCS — Michael Everson ( WG2 N3014,  L2/05-368)

2007-05-15 Proposal to Encode North Indian Accounting Signs in Plane 1 of ISO/IEC 10646 — Anshuman Pandey ( WG2 N3312,  L2/07-139)

2007-05-21 Proposal to Encode the Kaithi Script in Plane 1 of ISO/IEC 10646 — Anshuman Pandey ( L2/07-199)

2007-07-31 Towards an Encoding for North Indic Number Forms in the UCS — Anshuman Pandey ( WG2 N3334,  L2/07-238)

2007-10-07 Proposal to Encode North Indic Number Forms in ISO/IEC 10646 — Anshuman Pandey ( WG2 N3367,  L2/07-354)

2007-10-14 Changes in L2/07-354 North Indic Number Forms (vs. L2/07-139) — Deborah Anderson ( L2/07-390)

2007-12-13 Proposal to Encode the Kaithi Script in Plane 1 of ISO/IEC 10646 — Anshuman Pandey ( WG2 N3389,  L2/07-418,  L2/08-194)

2008-04-11 Request for removal of digits from Kaithi proposal (N3389) — Deborah Anderson, Anshuman Pandey ( WG2 N3438,  L2/08-156)

2008-10-15 Proposal to add three Kaithi punctuation marks — Deborah Anderson ( WG2 N3544,  L2/08-370)

2008-10-29 Information on U+110BD KAITHI NUMBER SIGN — Deborah Anderson ( L2/08-400)

2009-02-01 Comments on Kaithi Punctuation Marks and FPDAM 6 — Anshuman Pandey, Deborah Anderson ( L2/09-070)

2009-02-02 Details on Kaithi punctuation (based on N3389) — Deborah Anderson ( WG2 N3520,  L2/09-071)

2009-02-10 Proposal to Encode Section Marks for Kaithi in ISO/IEC 10646 — Anshuman Pandey ( WG2 N3574,  L2/09-089)

2009-08-05 Kaithi Decomposition Questions for Unicode 5.2 — Deborah Anderson ( L2/09-270)

2016-04-29 Proposal to encode Kaithi combining enumeration sign — Benjamin Yang ( L2/16-097)

Recommendations to UTC #147 May 2016 on Script Proposals — Deborah Anderson, Ken Whistler, Roozbeh Pournader, Andrew Glass, Laurentiu Iancu ( L2/16-156) (See section 10 for recommendations)

UTC #147 Minutes ( L2/16-121) (See D.13 for decision and action items)