I don't think it's a token like you mean. If I'm not mistaken the "token" is essentially a secret string. The "token" gets transferred when Alice reveals the secret string to Bob. Then Bob can use the secret string to redeem sats from the mint.

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I would guess the root idea comes from the hawala system. If you understand hawala then you might understand ecash as well.

Lyn Alden explains it in her book "Broken Money".