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 0x6b5659949a5d4d5d0c28f34a78ee533ef1590c72a828a4b0fa41ae725a75b974. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4a309caf-05e1-4152-b23c-670429043a18.json and https://artists.proofprofile.net/proofs/artist/4a309caf-05e1-4152-b23c-670429043a18.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 0x93aacaa1158bc20e129baabfeffb3d4b58c4987e600779bbc35d55df322691f7. 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/QMANG2207067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35dc722617cbaf5bdd99b652addb8df944d65dc574a15e9a5033969859c53583. 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/QM3DF2259421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fd8689707e08422c67ded91d6928bd7ef4d055b9d80681e6dd33bba9552104a. 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/QM3DF2234376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677b20531ebc79ccb838d78889944531d1b845cf5f292bf9bd1479a9e18a731e. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QMANG2224274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc758c0d3ab225fbfbd8f435cb5e61c88fdfbd41709a0f414e7094cc3850b23f4. 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/QMANG2247109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a37ee134c29fbae0583e7b88e595068e87c0c23e478effc23a02766b7ba0a94. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QM3DF2240841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe164796d842bf40b60eb3065ea94cd3590dd6e913f441892ed68528a89d16da. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/USANG2296780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dab6c3785fbf459fdacae1129dc056e691cec8f69fdf829687dab50b9fa0748. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QMANG2213707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36ff01e44915623a7afdc85e5b58a8bc7d4f3e93acf54b43b5f8943b38fc6fa5. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/QM3DF2216068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51fbef02c2349055ad90ee1513d9132cdd3ea1ff07add67a18194245214816f2. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QMANG2235228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29692950131e5958daa34a5eaad687a0b844651e1a6cc249b5f3e3e6821eac14. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QM3DF2276246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x252a251a099471fcb4ec81e0e406ba5a1555d064e158fc7ad6fde257a9ae129f. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QM3DF2250288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca18971c37a684d947a4f7ec5778f8d98a202f621b08301cc8a01192aeab0e6. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMANG2295085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f4433864a632ecd256a543ffb35333e6e40fb1a79c632aa4bc37dc6a34c2b4. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QM3DF2293822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf10f54cad88ec49ba60e0a3936494349182f5d22c1d04186be420b7f630801c. 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/CZA163389257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cfed9c1452e1cfb15db44c4ff647e898fd9455ff4d256a7abd45bb1639b04bb. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/CZA163389258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d3781f8249fe3bae1e6cafef29cc33ecae4b23d17f6b5d9c32a151bf77a9ad6. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/CZA163389259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19111a39c4f90568146247880be10075b61bcc401f9564d1d9545a9a0d95f496. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CZA163389268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b7cdff645a981b7eba6dae103ff3fe8d35cf35f140bef127118e1754c542b90. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CZA162253099.