Maria Sławek (born 24 February 1988) is a Polish classical violinist, performing internationally and teaching at the Academy of Music in Kraków. Her repertoire ranges from J.S. Bach to contemporary co
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 0xaab32c105a349053d1518850aaf4dbcc039e0be88a27a7e1e767e85e58cf3a35. 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/5db9082f-39c4-44c6-8206-dd5a653c65c4.json and https://artists.proofprofile.net/proofs/artist/5db9082f-39c4-44c6-8206-dd5a653c65c4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
15 Inventions (Arr. for Violin & Cello): No. 4 in D Minor, BWV 775
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 0x796b51b6c7b8cc3573b1687176213943eecbdf7f45add634635e52ba13a5ef9e. 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/PLB351926404.
15 Inventions (Arr. for Violin & Cello): No. 8 in F Major, BWV 779
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd2cff85db90c4d64720a081a66b92463eb2a1e53744f1246e085a1622437ff8. 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/PLB351926408.
15 Inventions (Arr. for Violin & Cello): No. 12 in A Major, BWV 783
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7626ceff938d875cb81022b01b379cc1b2a2b2e780af4df5722d36f4ba837af5. 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/PLB351926412.
15 Inventions (Arr. for Violin & Cello): No. 13 in A Minor, BWV 784
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea3bfc9ac412ccd4e43d251ef4589af9f5c10cc646b812cbf4415bad2a03514. 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/PLB351926413.
15 Inventions (Arr. for Violin & Cello): No. 14 in B-Flat Major, BWV 785
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1387f31d50c63bd6e9da286278b79a6201640f36c219c5ae0801b926dce32c64. 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/PLB351926414.
15 Inventions (Arr. for Violin & Cello): No. 15 in B Minor, BWV 786
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbff20f9b202855856f4b6797c3c4fc8c2b80763372700153e22eceea1dc81ec6. 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/PLB351926415.
15 Inventions (Arr. for Violin & Cello): No. 1 in C Major, BWV 772
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73a0bd0869723fcc5f4626a5641ecc887355030236a4030f0df7072e704d688. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/PLB351926401.
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
15 Inventions (Arr. for Violin & Cello): No. 3 in D Major, BWV 774
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c93d4777d706ea65a74a2f90d6c1e54bb23e28b8c33e9f792ab140823aa8c38. 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/PLB351926403.