Krzysztof Eugeniusz Penderecki (; 23 November 1933 – 29 March 2020) was a Polish composer and conductor. His best-known works include Threnody to the Victims of Hiroshima, Symphony No. 3, his St Luke
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 0xe609a23f7acae82d807c8e443337c8751359795cb8a862985ef1919034ca9621. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/918219ff-611d-405f-8343-6ac0b7241f7b.json and https://artists.proofprofile.net/proofs/artist/918219ff-611d-405f-8343-6ac0b7241f7b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Krzysztof Penderecki: Sextet, String Trio, Cadenza, Per Slava, Divertimento
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 0x3669922d8274c2e0d1185d90ec62aed04d9e7e031996d769dd86311da6b7e8b2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FINDE2300134.
Symphony No. 7 "Seven Gates of Jerusalem": III. De profundis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1a043a1398d90f0d3ebcc982f6f9ab1ece50fb42df12a242bfbc9496e0727b0. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FINDE2300135.
St. Luke Passion, Pt. 1: No. 12, Miserere mei, Deus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68357410524da374100ea2ac1d9c1711b139aa80482730062a28063a9659974a. 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/FINDE2300139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b229d6987d25731b1dc56915802be58e1125e490d9cbc3e9231d42e0d8462f3. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FINDE2300141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151703b066bff93a0ba4d29f652d0035a10c3c05658f2d2782b32e9a7cee7067. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FINDE2300142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x112122a72aa51bb07bc362416e0210df3f550c81bed7856ad34d4bf03dad0068. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FINDE2300146.
St. Luke Passion, Pt. 2: No. 20, In pulverem mortis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a8017ea0bd84c46e89e2c6439ded2fb67bc9bd96d4ed41aef50da4815e450bc. 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/FINDE2300136.
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 0x02040bf2e50b93b053db8a9b04304e9307bef2b05654069171c61ed40d3f6274. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/FINDE2300137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81debeb0afd0cf00a8b753e8c99422968d2db991d9ae8945745568b3a9826235. 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/FINDE2300138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30badaebb0dd41283d7dd525893bb9d5b76076496a4110894e7bfe71f4b8505e. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FINDE2300140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d03283c72c7199d7a519d58b095e3803f49ab4e865e39ebee19b0fc0deca007. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/FINDE2300143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c6b4f7b2fb45aec2878452149bddb6a665db772f4558b0c75b62488a6a91b6. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/FINDE2300144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4beeec0c89d8d65e0ef86b849ddad45e6d2968ef90fc08e6b3a1732ee546aa8f. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/FINDE2300145.
Penderecki: Music for Violin, Cello & Orchestra
Penderecki: A Sea of Dreams Did Breathe on Me...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43407e9b5acd38f8e0fd1e827bac353df1cceea45f50dce970935ead22f3fc89. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBAYC9401790.
De Natura Sonoris No. 2 - 1994 Digital Remaster
Polish National Radio Symphony Orchestra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bf9f474eecdfa8eccb7c7d550ed72412bf416725600a0cf26fb1e1446a701d6. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/GBAYC9401793.