Sebastian Zawadzki (born 14 October 1991) is a Polish-born jazz pianist, composer and film composer based in Copenhagen, Denmark. He has released albums since 2014 and composes and arranges music for
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 0xf1732039f89a1bf89589092a62dc49f06da24f267a65f29172c0c7bc9a2596d6. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/39192f18-45da-413b-8bd9-251c06e8bcbf.json and https://artists.proofprofile.net/proofs/artist/39192f18-45da-413b-8bd9-251c06e8bcbf.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd130242bcfd7aa8bb5292f0c6384d277b791fbb9aaf9b1b099b0b9b1ec48e559. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T13:19:29Z), 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/QZFZ32301250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef0e99465f7d7cafec26d27de40d5914efacb7a351059937963f83398752bd9c. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T14:47:24Z), 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/QZFZ32301251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f675adc2e8fd65de75f252a5ad3da5af46a184c7463502496ee614310e4e169. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZFZ32301254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5810a31be5f11af6b7416fbe939535537a03c065315fba98ffcbcb72b6a5cd0. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZFZ32301256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca9fe079166ed65490a8178a1b9e4728e7605ac5a98af4d8bef9cd550282bce6. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZFZ32301257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98ef43edc717e1d378113334847f6c3373831d8f6469ae2cba2a973231352de6. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:18:40Z), 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/QZFZ32301258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ff053928f0cbcc44834b4debb2a41dd1af65f81e860bb70793c882c6df16141. Chain 2 (Bitcoin): anchored in block 957544 (2026-07-11T09:08:48Z), 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/GBKPL1957112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ff053928f0cbcc44834b4debb2a41dd1af65f81e860bb70793c882c6df16141. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T17:46:25Z), 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/GBKPL1957112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151d71c0cbe10e7639d3e730b514668523fd9a291d759bd09f930b18ed58909e. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/QZTB72466354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151d71c0cbe10e7639d3e730b514668523fd9a291d759bd09f930b18ed58909e. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZTB72466354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc78af1b37933276b7454938539bbd785a89a3984edd4c779c51e10770b7fa81. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNWY2182848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d5f83b02e1322abc9612a37576e0983a35311065eeb704143cd25a0683a67a. 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/QZTBD2440173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef2b334965f33c7d223fbe85751149c0980164e5ca061aae0e805dcfa4931fad. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZTBA2514800.