Kabaret OT.TO is a Polish comedy music group founded in 1987 by Wiesław Tupaczewski. The group officially started on 1 January 1990, with a line-up consisting of Ryszard Makowski, Andrzej Piekarczyk,
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 0xa16d025f3621b07c966a2dd8302ab3742e62576a42185cc2753c5ece2cbd4734. Chain 2 (Bitcoin): anchored in block 953610 (2026-06-14T07:58:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/13c1d30e-521a-485f-9c82-dc38684df623.json and https://artists.proofprofile.net/proofs/artist/13c1d30e-521a-485f-9c82-dc38684df623.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 0x6f58d0ef00f69f155b9351b9717566ceb8330d5b82d32a683212125220790b44. 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/PLA392300402.
Koncert kabaretu OT.TO z orkiestrą Zbigniewa Górnego cz. II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0758e62ebb67af85dc0753578ac60cd0a5ceda8f6e632585c625ef2dbf07a1ad. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/PLA392300323.
Koncert kabaretu OT.TO z orkiestrą Zbigniewa Górnego cz. I
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e42c84727652996504df86032430dc39657f5721d27612350b5b0623eeff371. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/PLA392300388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2801ae77f6e66aad9548cd307875775c51335d5a68675b5f3903421b0fcf92fb. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/PLA392300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e644d49bcc89e669c2b8092c08aa8fd17bbc8d087abb52f7d5c4273ac88851. Chain 2 (Bitcoin): anchored in block 957874 (2026-07-13T15:43:57Z), 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/PLA392300023.