Boris Blacher (30 January 1975) was a German composer and librettist. Life Blacher was born when his parents (of German-Estonian and Russian backgrounds) were living within a Russian-speaking communi
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 0xdd737bcde3038c9f7e60d975aa42d16c67a7473d5609e76e543632b9b3bbbb75. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/819b8c46-7101-4d5a-932d-85fbcaa27091.json and https://artists.proofprofile.net/proofs/artist/819b8c46-7101-4d5a-932d-85fbcaa27091.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Blacher, B.: Concertante Musik / Furstin Tarakanowa Suite / 2 Inventions / Music for Cleveland / Clarinet Concerto
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 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 0xa03be08ffe4ee3060cbbed2428c612f0077798d971f2858589d9943f8a441bc8. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/FINDE9700209.
Einem: Piano Concerto - Blacher: Thirteen Ways of Looking at a Blackbird - Egk: Quattro Canzoni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8983d9964504739ac66156abd41b48bdefd6886b54944cb1f7aa2beff1904424. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/CH1491904704.
Blacher: Dance Suite, Poème, Hamlet & Concertante Musik
Der Großinquisitor, Op. 21: Teil 1: "Nach seiner unendlichen Barmherzigkeit"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aeabc352c27a2b91007a618d8ba54e0903a36c9b186dbe0a1bb138776630c1a. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DES380011671.
Der Großinquisitor, Op. 21: Teil 1: Adagio. "Unmerklich und leise kommt er daher"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf53a98c4bc0d4b710287ada9e6101e60a43e04b928f84d13a45ec90333feafc6. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DES380011672.
Der Großinquisitor, Op. 21: Teil 1: Allegro assai. "Aus der Menge tönt laut"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa655423a6e1564f98622cb320e5d098b6db313885e9e996a120f585817a16719. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DES380011673.
Der Großinquisitor, Op. 21: Teil 2: Andante. "Drei Mächte sind es allein"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54c4e5060f47f323ea40f06414bd61577afee6b2b11a79e7d976d71da27c2954. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DES380011681.
Der Großinquisitor, Op. 21: Teil 2: Vivace. "So höre denn"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b959c3dcdabf9de7bcb4f69447f4bbc0c8ec0f3d898b7f1e0c01809c473d82. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/DES380011682.
Blacher: Concertante Musik / Orchestral Variations on a Theme by Paganini / Piano Concerto No. 2
Testimonies of War - Kriegszeugnisse 1914 - 1945