thumb|Wiktor Zborowski at the 2017 Berlinale Wiktor Zborowski (born 10 January 1951 in Warsaw) is a Polish actor and singer. He is the nephew of actor Jan Kobuszewski. In 1973 he completed The Aleksan
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 0x559ccb71903c42a97d8f9ac47da9e4bca4b92c2e145094afc31a28f8ae9968b2. Chain 2 (Bitcoin): anchored in block 953733 (2026-06-15T03:12:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/97a60bbc-347e-47ae-9e48-992d2add121f.json and https://artists.proofprofile.net/proofs/artist/97a60bbc-347e-47ae-9e48-992d2add121f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x386d8f0130525a179e2bbc39b6e03c28b2070985a27b99420f6a8df68a7e55c1. 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/PLF781800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f3bb853f53c5be438de4feaf3736fb2fc6de9fb045f321934d6bddd0b94536d. 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/PLH400000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x622aec57594bab56150c7aec4d0e7152cd86ef94e659248b72a47871626b86e5. 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/PLH400000014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4d3d2504ec9ba80fa62c7dace998d866ce40f46f6ee17c21f4d209e701d875. 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/PLB170800789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51b299aa53f0fede99ad312bf9f5aca1cf11cc144c5163953925755d26d5c11. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/PLB170800770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb12c2f486fb6e25043dc97c7177251efe8c7d9bdd3be4d273083c1468fdaee9. 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/PLB170801979.
Wojciech Młynarski Zaśpiewany (Dobre Piosenki)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x559a729a7b4b168e5a8f5c75aa79e9eeaba3b8de01cea3abfd0aa394ba3e37ee. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/PLB171500249.
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 0xe6e051f7d2d8881a5a713de48b13aa16c467f3c705e1b9eaed01d41f98d2fb72. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/PLB171500252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1710d97c7f4803c2d32923f5843587150a36f147154e64dc29f7f2f0cdec76b. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/PLH400000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eefbdac845b1f1f8b1d0f0ed50aa73fddc8c32f1aa6d0cd67cf690f4141bd07. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/PLH400000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77160e76cdf847f4478781c7ee21ef255e370d7eb800eb361d4a04655a75bac. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/PLH400000018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf278bc7a7b099e3694919b750c255f668df46630921d9fa10b97b0376896b89. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/PLH400000022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x342e3579565b2bc4df434d2d6c6592232747c1d58cf45e8607a0bf68a15409d2. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/PLH400000023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7843f9a0600549d0a31476cbb984d07731a0bd9fd6c2815d26eecdd19a6c1c. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/PLB170800792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d163e7d22d249961be6ee0c2f6ed928933e5db80c2e1f57cc23f527abee36f9. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/PLB821900109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12ac9905fb926442843bce1459fd078cb6117c82e38d5fb720d3364f2e5a8d81. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/PLB821900145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976c1230564f2595934b78b9eeb6c58fdcf049cc261e28cc98e3c25d290a6dcf. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/PLB171600257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65428247474d8dba2b4017393293fe7bb21bd295a0da400a689b477c3a027aa3. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/PLB171600264.