Okla. Stat. tit. 42, § 42-171: Assignment of liens

All claims for liens and rights of action to recover therefor

hereunder shall be assignable so as to vest in the assignee all

rights and remedies herein given, subject to all defenses thereto

that might be made if such assignment had not been made. Where a

statement has been filed and recorded as provided in Section 142 of

this title, such assignment may be made by an entry, on the same

page of the mechanics' lien journal containing the record of the

lien, signed by the claimant or his lawful representative, and

attested by the county clerk; or such assignment may be made by a

separate instrument in writing.