Child sexual abuse (Porn) images / links on the Bitcoin blockchain?

Child pornography links found in Bitcoin's blockchain
https://mashable.com/2018/03/21/bitcoin-child-pornography/

"If you’re mining bitcoin, you’ve got child porn sitting on your hard drive."
https://nypost.com/2018/03/21/blockchain-for-bitcoin-is-infected-with-child-porn/

"German researchers have discovered unknown persons are using bitcoin’s blockchain to store and link to child abuse imagery, potentially putting the cryptocurrency in jeopardy."
https://www.theguardian.com/technology/2018/mar/20/child-abuse-imagery-bitcoin-blockchain-illegal-content

"Images of child sexual abuse have been found embedded in the system powering a high-profile crypto-currency.

Somebody added the illegal images to the core ledger of Bitcoin Satoshi Vision (BSV) by using a payment processor."
https://www.bbc.com/news/technology-47130268