thumb|right|Remarking on the anti-Nazi resistance movement fighting during the Warsaw Uprising, Polish President Andrzej Duda has stated that "thanks to its... determination, Poland exists". Determin
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 0xc7eeb18e096ff5bba44beff0bed34f2d534c3f5d7d2cda072377ef62b14d415e. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/15cca373-12ee-4bf0-9d05-2a0faf8a1d88.json and https://artists.proofprofile.net/proofs/artist/15cca373-12ee-4bf0-9d05-2a0faf8a1d88.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).