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 0x9a1062ce9dd4ee64f2fbeb28a9a89e1f849e65f8ff02415747067b0fcc076b71. 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/2c6f89ac-9a35-4462-877c-298d3ab9bd04.json and https://artists.proofprofile.net/proofs/artist/2c6f89ac-9a35-4462-877c-298d3ab9bd04.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 0x2c17ccc327cb7af02c036e8a9b7683c2a31150d4071d5b27c02e7b74a8d8368a. 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/USJ3V2014115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x223ee6e8fe4dc74f1a9d75eb171ce781fb96372d1b5a2eb6eeac7b9696651268. 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/CZA232201146.
POSLEDNÍ DEN (feat. Vladimir 518 & 7krát3)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc94d333280243a6f4c83fc3f23cfaeee1d28a89d7964cb5725f05d53c4642a80. 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/CZA231900589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e59046885e78048071ce224d96e7caf95dfcf1bc923c04d3c0cb1b03725a863. 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/CZH112500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1b51bc218577497ccac9a4dcf41ec5880ff5d9909f26d78ed97ea361a962326. 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/CZH112500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8f64f1ac943662bf45e3083e05614017353aa1fcb99faeab51a34b90ea1c89. 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/CZH112500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10feb2b8df38d3cfb631bb87c9f71ea12d7e743bddd30ff4c7cc10270bd39f36. 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/CZH112500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d9e9ce2d3903dbf8d80627645c86a9325ca4777ea2e156910f6607056f16e11. 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/CZH112500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bce63e0803419fd840514152809a3b1d9d7ee31d8a043b9ae0c94b6f17a8776. 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/CZH112500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c092d11571f694ed8c59cc2b9a1e72bc92c9524c2558a289cd0336bd765625a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CZH112500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd6626e6747fdfd1109b977f923a4550584f7a633b254c1189aec6e5b75e1d8c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CZH112500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b41ca50b952691edd4c005287d6cc277e01b18f3fa1ae145bf26fe4237b08c. 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/CZH112500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e064718a115518123e21a931ff780be74c4111c20211ed979d5f036bc66d63. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CZH112500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d88caa0d3a239825f633c41429c33d30d8bff37e65f9cea8e6141166ec6a76. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CZH112500011.