A kapo was a type of prisoner functionary () at Nazi concentration and extermination camps. They were, whether voluntary or coerced, collaborators who worked under the Schutzstaffel (SS) to carry out
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 0xf73945997088edf1447c7d4b71cefd2758c6b5918c2ed5b16b8e5ce6b44e2c4f. 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/773509b1-f199-45bb-b12a-4488ac5c2f5c.json and https://artists.proofprofile.net/proofs/artist/773509b1-f199-45bb-b12a-4488ac5c2f5c.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 0xa21cd4ce06f0dc490a36c763e6a149deecc1e0170878899650398690bb7e0988. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/COAF42491444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x801d7275df9eeb458365b189ccf91b73923f1a5d017e9ef739647f08d8b3598b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62300879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2794ff8d894e1bb90c82be5da792ff776012894fa3728ac08522025c07a1ab7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNWQ2115502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb99412f49164a4183fbaf30dce9cb87cafcb28e2b3b6951596f04f6928869113. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/UYB282310601.
Bulevar (feat. Nanpa Básico & Brray) - Remix
Bulevar (feat. Nanpa Básico & Brray) [Remix]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21eb5f9687ca34b5d57170ce402be520432a1c1bb278b72f8b6eb1c07ef75fc2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/MXF152301842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31c3694b4455d97d32d567d94795344e499df549b26be88e7df5ea02a7ad0ed0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/COAF42392114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb3a3526b99e3b855ff96684d02342ff5af528a329adcf5cbb3d76e84e973a93. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZWDW2319973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ebeab8a10d768865c267d99ad015d3a0a73479ff874833ef42d70951e11044f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USA2P2215309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd18b477cca7d183df2b067b43494b5433cafa9eca53e18f6e6a2ab20a0548efa. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES75E2202355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e12d4e922ce20101c18c59776400a83fe7bbcfa4750c8be2f0bdc4eb7c7095. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/COC012337763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b0023811faa8d47a533cb8983ecb624f803c20117c7215187fda33e746dfabe. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZDYA1800399.
Ohnana (feat. Farruko & Nicky Jam) - Remix
Ohnana (feat. Farruko & Nicky Jam) [Remix]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1fd017bde01d542f254eba521c5fdb0ca785a39f4b241ffa1f86456ff5a4490. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZDYA1800394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd96e17f8c5893faa8ff71afb078c7d00766f47180f5a160960c59d26c7c5f78d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/COAF42494729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfb71b1fa915ac272a70553c35dd7fc8802aa0724de39feee46953fda83d5901. 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/USWL12403546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea3d3ea3594d808220373a91c64aa26d72bac06c001c07909d83804b2cc7a32. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZZ662329861.