Kombii is a Polish pop rock band created in 2003 by three former members of the group Kombi. In 2003 Skawiński, Tkaczyk and Pluta created Kombii, without Sławomir Łosowski (who was the leader and cre
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x740dde2b48ab1dc056dd306475792fa32b0a3ed3bf7f91ec268e4c9521c9e2f0. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e2e2cbae-a1db-4f14-b04e-b18ad79bad2f.json and https://artists.proofprofile.net/proofs/artist/e2e2cbae-a1db-4f14-b04e-b18ad79bad2f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).