thumb|Karol Lipiński. Portrait by Maksymilian Fajans. thumb|Karol Lipiński by Walenty Wańkowicz, 1822. Karol Józef Lipiński (30 October 1790 – 16 December 1861) was a Polish music composer and virtuo
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 0x00613f95ec1d0062071b4b773129ddbe0f5e7354e7cc256ea9ef2f9766b31ce5. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/68725d15-8726-4f4b-a725-23c9f79aeb34.json and https://artists.proofprofile.net/proofs/artist/68725d15-8726-4f4b-a725-23c9f79aeb34.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Lipiński / Moniuszko: Overture "Bajka" / Symphonies No. 2 & 3
Karol Lipiński: Symphony No. 3 in B-Flat Major, Op. 2: I. Largo
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 0x152dc1a8fa763424beabff1b1d1d338e79a8c567aa0e455c61074290ada4a947. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/PLC702214305.
Lipinski: Trios for 2 Violins & Cello, Opp. 8 & 12
Karol Lipinski: Trio in A major, Polonaises
Karol Lipinski: Fantasia, Caprice, Impromptu, Trio
Lipinski: Violin Concerto No. 1, Rondo alla polacca & Brawurowe wariacje
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a455a941582fab346002085a00ff32b7c012610601d2a0e1ab750de3b12a705. 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/DEB200191201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa22baa992d1d8510b879f3daac68d7b8966e7fab58eeee7b433bbe1becec9c43. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/BEC990952704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61b1a76c66a1f392b8a9c7d77ce58750e3012b5f3c7a6ea5a8a3fc2b73a75b5b. 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/PLB170902102.
Sitkovetsky, Yulian: Art of Yulian Sitkovetsky (The), Vol. 4