Natasza Zylska, (born Natasza Zygelman; 13 December 1933 – 29 March 1995) was a Polish singer of Jewish heritage. She was one of the most popular singers in Poland in the 1950s. Her most famous song,
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 0x2b538f0a525b82023c4780c8da7d39dddaaa13edc6ac1dc0260abec9bcd35a10. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b15d7997-d7c8-4538-9d39-8184dc2f20cd.json and https://artists.proofprofile.net/proofs/artist/b15d7997-d7c8-4538-9d39-8184dc2f20cd.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 0xb2b1a44b7f1fd4b2a163a6a09e2644be387df8c548f2d9a7071da028dde0bd51. 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/PLA245604884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a13399b6daab57b1321715ebd50acf76b8f45ceb583afab6bb1f13d608bb54e. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/PLA245605054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3553645d4979c5ce21e2ebba30000debcfa424d9a42b8c735ff2595d30e4fb6e. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/PLA245604882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80cd72bac1c9d8be6e370c617e9cf36ba2a71f30add411b3d8961e27b504e2ad. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-21T21:26:32Z), 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/PLA391588409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80cd72bac1c9d8be6e370c617e9cf36ba2a71f30add411b3d8961e27b504e2ad. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PLA391588409.