Klaus Mitffoch was a Polish rock group founded in 1979 in Wrocław by Lech Janerka, Krzysztof Pociecha and Kazimierz Sycz. Soon joined by Wiesław Mrozik and Marek Puchała (who replaced Sycz on drums),
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 0xb6f584453aeddc761f8a4fec9b0200dacb4c7f07132a14bef122c4be8e405088. 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/e76d48df-5142-4e4d-8e6e-9ed36511fa67.json and https://artists.proofprofile.net/proofs/artist/e76d48df-5142-4e4d-8e6e-9ed36511fa67.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 0x4fe27522ea873a159e0b0ba7cdc96f95bc5826063a66c59f87527a0dd4a9c99b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/PLB171001051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfbe3b30436568e92287cffbd4bbf4ce005f689433b8b72eb8ef4c389f5423b6. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/PLB171200754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3860ac9e5e07000d9e0bcf87b14947729ead73c4e17a0c0bc8a84fb1422d9485. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/PLB171200756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506bcaef7e418c5d8589f3cb155fffe3b8d73b02450451b814aa9d7794e3b7cc. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/PLB171200757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x092b57b2b2d06c616bab8b47bb4155f76ceaa1d8630e33cd26402a6021e1bad2. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/PLB171200759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa138d9b596b4e27929abeb7e27e803ac74112e3e7447289113333299d3470eea. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T08:20:42Z), 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/PLB171200760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53bee76548a23d9af325bda714d1454c43474e985357c6edaf84dc70afcc4850. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/PLB171200761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd893f94b65990a6ad84587fc860cb8940b6deef36a7df805752f7260dc5b9b4d. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/PLB171200762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d17e0341775f401416dd7d814575de8fe374455b3aaa73821137c5a1342a3a2. Chain 2 (Bitcoin): anchored in block 956404 (2026-07-17T03:26:01Z), 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/PLB171200764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd316c869ca1b7713bc6ef643549e4c9670d12b87972a9be6a9000319ac75e6a3. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-22T02:29:22Z), 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/PLB171200765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0abd7a642a7b1e78960099fc5e6342b3eff0e131daa67cbf70a414c85c553348. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/PLB171200766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf24561b96b2a517d60b26fc481e890b7b2f24af4f32d2f25429e826fff6c2c6f. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/PLB171200768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59746c36e39f03859869217a6241dd1fc02e39c93613b9ac35e6026e216a792d. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/PLB171000322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18841386b6a211542c35c58b716a1826a7804a4e865bb0177540a677f208609f. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/PLB171000323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5716555daccca63ba9890b4434e7d10e46f3b3fd0109dd82951706b1a511bf5. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/PLB171000324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d3e24b89f38d7179ac5e2d62b5840b04849954ab158362be4180c38cc1d1327. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/PLB171000326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c3b6e2a29df03ca3e371d36eb3516ff6daee4884cbe0ab668e9f40419306774. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T07:36:20Z), 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/PLB171000329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24e752aef1f502d3004291f02087e1dd2e7ac5919faa17fb42a84d3803735f55. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/PLB171000335.