thumb|Friedheim in 1912 Arthur Friedheim (, 14/26 October 1859 – 19 October 1932) was a Russian-born concert pianist and composer who was one of Franz Liszt's foremost pupils. One of Friedheim's stude
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 0xc2bd0877201aa3422509010f2c506bd5876d56a257fd1409f591cd14ed4e91a1. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4bb44be5-59d7-413b-a073-ac081844a39a.json and https://artists.proofprofile.net/proofs/artist/4bb44be5-59d7-413b-a073-ac081844a39a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).