Karl Erb (13 July 1877 – 13 July 1958) was a German tenor who made his career first in opera and then in oratorio and lieder recital. He excelled in all these genres, and before 1920 gave classic perf
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 0x48ae17df805fbccdf461364650c0fcb74876d568bd766ec1e6764ee64bb63d13. 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/473abe62-d8a0-4ca3-9142-f981cb03e717.json and https://artists.proofprofile.net/proofs/artist/473abe62-d8a0-4ca3-9142-f981cb03e717.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Lebendige Vergangenheit - Karl Erb - Liederalbum (Vol. 2)