Transactions placed by Starknet Unity SDK fail with INVALID_SIG

[stranger80]

Example transaction: https://voyager.online/tx/0x57c4629e85af685a96c44f32c334acbdb71da3a686f152f576e2ed34919455c

The transaction above has been REVERTED with following trace:

Transaction execution has failed:
0: Error in the called contract (contract address: 0x02b791c446093c6b8d8e0d95c0a61de2e6796071447359590acad906265440d8, class hash: 0x036078334509b514626504edc9fb252328d1a240e4e948bef8d0c08dff45927f, selector: 0x015d40a3d6ca2ac30f4031e42be28da9b056fef9bb7357ac5e85627ee876e5ad):
Error at pc=0:29965:
Cairo traceback (most recent call last):
Unknown location (pc=0:351)
Unknown location (pc=0:9587)

1: Error in the called contract (contract address: 0x076f7bf89ee554e8e182be67600e006fc543339f6074d04ce5c86515525539bd, class hash: 0x05264c6c0592736791c46c23f3de88acdc3e59e4c36b072a3f06647be324f107, selector: 0x010ca239b3b9a55c94d45a8e6171d94bab2f955e1ac2dc2cd7dbd3dcf889032c):
Error at pc=0:12302:
Cairo traceback (most recent call last):
Unknown location (pc=0:2198)
Unknown location (pc=0:6541)

2: Error in the called contract (contract address: 0x07ac6599f16638ea85e9b4f296be4f6166b89100f538a3426a6c6e01ec61a353, class hash: 0x00816dd0297efc55dc1e7559020a3a825e81ef734b558f03c83325d4da7e6253, selector: 0x028420862938116cb3bbdbedee07451ccc54d4e9412dbef71142ad1980a30941):
Execution failed. Failure reason: 0x494e56414c49445f534947 ('INVALID_SIG').
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