A default by the "Credit Equals Gold #1 Trust Product" would send a shockwave through the multi-trillion dollar "shadow banking" system in the world's second-largest economy.
Industrial and Commercial Bank of China (ICBC) said last week it had no direct liability for the product, but is now processing a return of principal for investors.
Under a restructuring, ICBC is requiring investors to sign an authorisation for China Credit Trust, which structured the product, to transfer their rights in it to an unidentified "prospective purchaser", a document seen by AFP today showed.
Wu Min, an investor who signed today, told AFP he was informed by ICBC he would have his capital back by tomorrow.
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"After all, 3 million yuan is not a small number," he told AFP. "I'll take it back first and see how I can get the interest later."
ICBC staff pushed the product by promising returns of around 10 per cent a year, far more than traditional deposits, investors say. It was paid in the first two years, although only 2.8 per cent in the third year.
Analysts said earlier that the situation was a test case for cleaning up China's risky "shadow banking", a massive network of lending outside formal channels and beyond the reach of regulators, where speculative investments are rife.
The rearrangement would ease fears of a wider impact in China's financial markets, they said.
"As a default will likely be avoided... It is unlikely to be the trigger for a bigger credit event in China now."
But some investors expressed doubt over the scheme. "I won't sign the agreement," an investor surnamed Wang, who put in 3 million yuan, told AFP. "It's so confusing and we don't even know who the prospective purchaser is.
"If signed, this is just like switching from one indentured servitude to another, I certainly won't agree to do that," she added.