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 0xb0b535c3cd140251dd1e7a83f4d5836c1325336c2a01433f2f2cc2c99654425d. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/738f9351-7248-4e17-870f-0e95dd59c989.json and https://artists.proofprofile.net/proofs/artist/738f9351-7248-4e17-870f-0e95dd59c989.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 0xc8836e06e6c0b6f1fe24d13e623ad9a611c31661ec26db12d908845dc950600e. 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/UKACT1827063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08ac650030181a206882f2c82121fc6db9e9f80b6547b9eb2e0d4793cbddb536. 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/UKACT1827065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c67d6e05c5a555ae044a061c068026828fb6fd9f92f034822b69e49e5c6d9c5. 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/UKACT1827363.
Sangoma Sound System II (Compiled by Daksinamurti & Emiel)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0a0d879c7900db9b6437e96b7db69777e70847161329403a5da8ad64ae0b38. 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/USA2P1912096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9c37e82dfee3b49ba16bb7716933a4c44ad938dea2e902654d8b0b85d8e09f8. 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/USA2P1912097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac8d107783c4a5cdee767f4f3f1819cfc11db29c60e91b35db8ad359d925166e. 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/USA2P1683815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc682f76e47851e4b5412d3a30e58513f2fe613166d938f7c9bb5b435c139a3b. 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/USA2P1683816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8d04c210c096c63dbf3bcdf148a211ac6d1418a9b600f80ef52366e29a7a6e3. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USA2P1683818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2023c4079e921579b76c64536a93827294ed90af384019b52bb6790d1d93c05. 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/USA2P1683820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d5b919c397c19d9824f40521aa96368278d33c08c261f48a0e5e056b4554e63. 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/USA2P1683824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a52bedbb2ccc6062a197a13ca5f4923b854b0820a027edf743f32442b570448. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBKQU1741887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48b04ff7de81cb8f990fa5c6e4aa06ef17f51a7f2c9b7ce15d864694db69a911. 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/GBKQU1741888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedec887f27bd60e1cef1d2a86bc598326af2f8c48c1cd6d246700e13b992c536. 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/GBKQU1741891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c03c6ee0e0e6c451506cd0a1bc46948d263ceb5f58068d516f10ecb41dbca0. 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/USA2P2033192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dcffb5e88c3508c035ff8e42d0769e0f6bc5427518a6b6a1b14dc4c78f1a62b. 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/GBKQU2479214.