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 0x7bd0226ebad369d135074034aeb37f3cf29f0045eeb9db48fc77e550368bcbdb. 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/ede2ec9c-ef0a-4d97-92e3-3ad565f0e1e5.json and https://artists.proofprofile.net/proofs/artist/ede2ec9c-ef0a-4d97-92e3-3ad565f0e1e5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
W.Kilar/G.Niemczuk - Prolog from The Portrait of the Lady
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 0xd3510cab46aa9e215c99aeb9e20724ba6b84c5226edff247adc2d39cdbaaaef9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/SEYOK1633364.
W.Kilar/G.Niemczuk - Rejs from Smuga Cienia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed6fe6f1d39191313b028105b783d264e93d794cf6769cd599714a67dcd11b5. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/SEYOK1633365.
W.Kilar/G.Niemczuk - Zjawy Miłosne from The Portrait of the Lady
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5648163394c47d9420d3d74015fff0ad6df98ce6abf67204f6bde0a38f58c289. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T12:51:34Z), 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/SEYOK1633370.
W.Kilar/G.Niemczuk - Rodzina Połanieckich
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec0360f8198be1da88e3e38925fb2ba4277954045ce360689dc01b4423a444fc. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/SEYOK1633371.
W.Kilar/G.Niemczuk - Love theme from Dracula
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27e0b9f96a0bc8293a6219b5f62e474df76aa3a45b0f2fb93b1333ca5a35b70c. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/SEYOK1633372.
W.Kilar/G.Niemczuk - Theme from The Pianist
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff9757aba24c2c561912ed763ca2d0ee5b650793289315b9de9ed52df7c4dd13. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/SEYOK1633373.
F. Chopin - Complete Works for Piano CD 12 (1843-1844)
F. Chopin - Complete Works for Piano CD 13 (1846-1849)
F. Chopin - Complete Works for Piano CD 5 (1833-1835)
F. Chopin - Complete Works for Piano CD 7 (1837-1838)
F. Chopin (Complete Works for Piano CD 1) [1817] [1827]
F. Chopin (Complete Works for Piano Solo CD 8) [1839]
F. Chopin - (Complete Works for Piano Solo) [CD 11] [1841-1842]
F. Chopin - Complete Works for Piano Solo [CD 3] 1829-1832