The Court of the Lord Lyon King of Arms (www.lyon-court.com), the government agency in charge of registering Scottish coats-of-arms, has (or still is) digitized it's Public Register of All Arms and Bearings in Scotland.
Known as the Lyon Register, this records all coats-of-arms authorized by the Lord Lyon since 1672, and contains a good deal of genealogical information on well-to-do Scottish families.
i.e. Robert Adair of Kinhilt, 1675 (?) ......................... Alan Stewart, a member of the “Scotland’s People” User Group and the author of Gathering the Clans: Tracing Scottish Ancestry on the Internet (Phillimore, 2004), wrote
" SCAN hopes to digitize the NAS’s collection of sasines (land records dating back to 1599) " ......................... Some references found on Google were :
The Register of Sasines was founded by King James VI in 1617 and records the transfer of land.
[Wigtown Sasines 1617-1666 (ELD), R. C. Reid, Vol. 113, p. 13]  i.e. James Mulligan of Blackmyre, William Mulligan in Barmark 1625: [Balmaclellan]
[Wigtownshire Sasines 1619-1627 (ELD), R. C. Reid Vol. 143, p. 3]
Wigtownshire Register of Sasines 1620-1666. Handwritten mss with index. Robert Corsane Reid
R.C. Reid. Summary: 152pp. ;Contains: Extracts from Wigtownshire Register of Sasines 1669-1711