Ingfried Hoffmann (born January 30, 1935) is a German jazz organist, pianist, trumpeter, arranger and composer. He has recorded for Columbia, Philips, Polydor, and Verve. In the 1960s, Hoffmann worked
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 0xfc9fdcd427947190174afd80d4dea9433f3dab6f42a727aa015834478358c785. Chain 2 (Bitcoin): anchored in block 953730 (2026-06-15T02:47:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9358bd5e-8ff1-4dc6-bc2a-ab2c03988e0f.json and https://artists.proofprofile.net/proofs/artist/9358bd5e-8ff1-4dc6-bc2a-ab2c03988e0f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8760d56b55d6ab2f81aaa21070758c8a19bcf067930b4dbf28b0991a7306c892. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:21:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF076309310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4001adca781bfa443d00870feb1caf4937a3d29ba11a09e53e8f206ab7a05eb1. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DER810500089.
Lustige Lieder aus der TV-Serie Sesamstraße, Folge 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f1c5efc9c21efbc798f63075cfaadc7d252ce08710a4d6910788178f6e8af53. Chain 2 (Bitcoin): anchored in block 958668 (2026-07-19T05:16:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHC20802449.
Lustige Lieder aus der TV-Serie Sesamstraße, Folge 1