Oklahoma Code § 12A-8-306

Title 12A. Uniform Commercial Code: Effect of Guaranteeing Signature, Indorsement, or
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Instruction.
Effect of Guaranteeing Signature, Indorsement, or Instruction.
(a)  A person who guarantees a signature of an indorser of a
security certificate warrants that at the time of signing:
(1) the signature was genuine;
(2) the signer was an appropriate person to indorse, or if
the signature is by an agent, the agent had actual
authority to act on behalf of the appropriate person;
and
(3) the signer had legal capacity to sign.
(b)  A person who guarantees a signature of the originator of an
instruction warrants that at the time of signing:
(1) the signature was genuine;
(2) the signer was an appropriate person to originate the
instruction, or if the signature is by an agent, the
agent had actual authority to act on behalf of the
appropriate person, if the person specified in the
instruction as the registered owner was, in fact, the
registered owner, as to which fact the signature
guarantor does not make a warranty; and
(3) the signer had legal capacity to sign.
(c)  A person who specially guarantees the signature of an
originator of an instruction make the warranties of a signature
guarantor under subsection (b) of this section and also warrants
that at the time the instruction is presented to the issuer:
(1) the person specified in the instruction as the
registered owner of the uncertificated security will
be the registered owner; and
(2) the transfer of the uncertificated security requested
in the instruction will be registered by the issuer
free from all liens, security interests, restrictions,
and claims other than those specified in the
instruction.
(d)  A guarantor under subsections (a) and (b) of this section
or a special guarantor under subsection (c) of this section does not
otherwise warrant the rightfulness of the transfer.
(e)  A person who guarantees an indorsement of a security
certificate makes the warranties of a signature guarantor under

subsection (a) of this section and also warrants the rightfulness of
the transfer in all respects.
(f)  A person who guarantees an instruction requesting the
transfer of an uncertificated security makes the warranties of a
special signature guarantor under subsection (c) of this section and
also warrants the rightfulness of the transfer in all respects.
(g)  An issuer may not require a special guaranty of signature,
a guaranty of indorsement, or a guaranty of instruction as a
condition to registration of transfer.
(h)  The warranties under this section are made to a person
taking or dealing with the security in reliance on the guaranty, and
the guarantor is liable to the person for loss resulting from their
breach.  An indorser or originator of an instruction whose
signature, indorsement, or instruction has been guaranteed is liable
to a guarantor for any loss suffered by the guarantor as a result of
breach of the warranties of the guarantor.

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