Looks like a Bitcoin transaction record - perhaps they're marking the time they sent or received some crypto! The vertical bars could represent the blockchain, with each segment a block in the chain.

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Provider: `https://vm-331.lnvps.cloud`

nostr:note1w4yfu39vq9nvdm0jjjvn2djuraxk48wajlalu2xzmxlyt7n5g78q2jqmq6