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 0x3bd08e067d9670ce2eafbe9af543ca653005487bc18b1fd46ce667f25067475a. 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/99e306ad-f109-4b47-986c-0b9716ac0c03.json and https://artists.proofprofile.net/proofs/artist/99e306ad-f109-4b47-986c-0b9716ac0c03.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 0xd2f742e3b93de5b631a6fbbe6ec519e0a9fe92079a444083210aab2db2484fa5. 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/QZXLZ2330209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5201b8fba39fa098deecc3edb947c6fb3bf15903b2b670166bd8be7172628ce. 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/QZXLZ2330210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02a799f10cf3a9411e5bac55c6d4bc82d71d6c984d58a241864ce0467af86fa0. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CH7812413289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8411c84dd92596849f74448694336c5d2cbb18400baa4d860396271771a010e. 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/QZZ972432471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b96da01804d2c4e432e2ca9d002f2d263d735984c24eaeefc8c1c274d5e35a2. 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/GX8LD2429984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e44f3fbda4e075c945e246dd711fd8af4535baf6d4de52f77c0b1c0aea2a930. 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/CH7812406295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf98fe13ce0637b5c52391dc678b5f68e591539fe7d6d31480d3428ebd021c8cc. 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/QZZ972430447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bab4f6f403c5fbe19fe4c33068f038792337a8ab0c5e2611a541e7f0eedadbe. 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/GBKQU2408078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cdca8d8e8790ae0d25cf770c6c57f18d92b38fe3d5c6eb5185f3577b4f6c413. 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/CH7812402804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca86fd35ee633b1ed1284540649472a655d6e7f676a4932252b762426e008c3a. 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/NLT2H2301148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x179511fbd404c705e66746dc2f30666ce494c82f47783d1ca920b585642cdfd8. 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/NLT2H2301085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e206904dc5d83380001cb4a0dd6bac2c72893f5bd2c98d6df665fb62ce9694f. 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/NLT2H2300994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250aab0a1aa1caed62863b4e690fa0df6eb87c4cdce87da9871654b58025d0e5. 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/NL8NY2300063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x763c9e7dc61ce905586ec4332c327fe3bac5d19d3cda124a41cbed62cfb61ece. 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/GX5MY2250856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e9cbe13d110292b34db096bdeaca07a59bfe0d6efbe12dae7c98b42b8c2d011. 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/GX3HH2237650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb431f835255f376556d01f4c7aa2dcac6debe5d82008a81e547f6fed747675fc. 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/GX3HH2289005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8562fc0534ac063c91fc233de4248d042384f30326360e6c7b6613049ac638e6. 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/GBWUL2159978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3877acbe1089bb766f97cee9eb09975844c85f20c58c4e5f8756b16e1e056cc5. 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/US83Z2025126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f9d7e1a3b7592f7bfbba893daccb61ef794a7cbda0a416129155edb0a6acfb. 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/TCAES2039255.