Rotterdam Termination Source is a Dutch gabber/hardcore group fronted by Maurice Steenbergen, initially with Danny Scholte as well. The group is most famous for its minimalist 1992 single "Poing", whi
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2c7d66a5f446a9c74f2d1608c60cff1db43d29cfa2bca2fd23efabc94d50ccd. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b1ffc91c-f888-45e5-989b-e51dd3aa7148.json and https://artists.proofprofile.net/proofs/artist/b1ffc91c-f888-45e5-989b-e51dd3aa7148.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).