Sławek Jaskułke (born 2 January 1979) is a Polish pianist, composer and bandleader. He is also an arranger, record producer, and a member of Zbigniew Namysłowski Quintet. He has composed piano, orches
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 0x2468e61715113b97a7e508d38a274047769930c482cf867999fef55fc6bb7b1c. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f4cf5900-58b4-4b7e-9797-1c3f8ea2788d.json and https://artists.proofprofile.net/proofs/artist/f4cf5900-58b4-4b7e-9797-1c3f8ea2788d.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 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 0x0aedf688b44943fa725aa15b39f8198bdcfd9f76a32c83e378a6bd1143550076. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/PLA811400088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe068cb137af78ae389bf1984ad23c471a9e1e48266ef6779ee27a0b0248486d0. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/PLA811400089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeabd33fedcef895c36c247e66667939ca0a02da0745d9a0792da72b2a966c530. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/PLA811400090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd502b280f27f3c2b24a72a60f8962abcbcc6104160919ee1f8c6d36a40c13df1. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/PLA811400092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ee14470e733334160019c7c9e587bf2cf40b6d959a0060e2b69c4bad4fc5b13. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/PLP131900101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x143ca35994a1430a3267238b67172d511ad29c6d5e5cb58705c21364145e23b0. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/PLP131900103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x032e021c4902b9f963efe8025f0850defd4fbef267552b6208427e66031a71be. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/PLP131900107.
Sławek Jaskułke at Inryō-ji Temple Japan
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf62399fa90bab052030e1225e88d03a42a590af2a0983a88540e237938e73e41. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/PLB360700025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f18807f5d39ba75133402410835d8fb234c4ca94ec9547189a678f34e90c73b. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/PLB360700026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19a26aed705694b2b731d3dee0752150372b948ece34333ea5fd14b447d3b7a1. 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/PLB360700027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e5e898ac447e536e8513aa0725f74a49a95ff32efbf44f392ddc6bda2c7c187. 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/PLB360700029.