thumbnail|Kroke logo Kroke is a Polish instrumental ensemble of world music. The band's name refers to the Yiddish language name for Kraków (, ). The band was founded in 1992 by three friends and gr
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 0xc20635725d5160c58a0a43fcb465218d389ac9bc943d31ffe7016d639dca8f92. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8e61ce1c-c860-455d-af47-e571bf4cc937.json and https://artists.proofprofile.net/proofs/artist/8e61ce1c-c860-455d-af47-e571bf4cc937.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 0x77890d9ce5d800615f4ea878682010cef62db4b4d3e09786ea340650481ca05b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/PLA551200277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe8354c8aa5cd75ad633a51fe2e312247a9a5844fc8be26db3585eff161b6581. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/PLA551200285.
25 The Best Of - Album Na 25-lecie Zespołu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5613b977e5bbf17fc4126fae7c52e6cd648db7738d7a6cc7e899f7a4d7aba138. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/DEK130304505.
Rejwach (Original Theatrical Performance Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x886ddd6b6657d6f870e5044c92ba3dc80799e1142d8f987d10f663b2a765a342. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/PLA391146101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47a5dd629fe7900c7bfb18d36373511f298a1107b7867eb315d2407119aef7a2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEK130706101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e8cde7a69da78e0d31cc9b00e754a675c3dd134f25f71e908719590b2217ac3. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/DEK130706102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab2b94a1445f64b65ed819a33cec461671e2db82985f9408b9f9e4df8d2e5c31. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEK130706103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8560c69c268aa0c965bb8550180c9fa08277ddb090936dbc54131ca0ca8cbddc. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/DEK130706104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652af38db8191624981090fc51b0584ec1e71180643e5410f09ba85e18066249. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEK130706105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x593576a3195f00c2ba9e32526893f49292b8ccfa32ccea25cb46961aa708c03c. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/DEK130706106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa09279541944430a57c9ac7cc27ac9947000dbf54b56d0fb7d15627e689be8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEK130706107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2baaf999719e51a9e1b32eed972098ffb94246e89c38f41cbb8af40d12b549b0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEK130706108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522d257ffd9132a44b81387878e6fdca662b30fa95ceffd374e24a0e587294e7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEK130706109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa8f957463fe6ab5cba6024216d1d3d0eba65d1977b744a034dea0921ea2cd3. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/DEK130706110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ab103232f09862146fe50bf7940c0b843938e9e600cc9620caa7a81f226e41b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEK130706111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa93632191372390f813c889e1333930503f12a2932258574e449b4ead312a021. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEK130706112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c2ee1e7939d1dc63fd553e10453e4480c6c8a3ab4fc4dfd1f87bc840f59d57. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/DEK130706113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c9082eddc61949efa172f0b3fb20c4bb32d65c5903d01358e048604ea5102f5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEK130706114.