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 0xbcc599e15817e4b59c70543bb64c920200a05e18fca10959dbead983ebc5fc65. 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/f234039a-a6a6-4775-8766-093cfe8d2ad4.json and https://artists.proofprofile.net/proofs/artist/f234039a-a6a6-4775-8766-093cfe8d2ad4.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 0xd2f462cc3a8d03cbd7aba0c8e010cdb6e4a2e8572955ad46a721cf5244c3a100. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNWT2467293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcff57a8984d57467de570e7cfcd49b985ffe3d75d43a33cac41882f823c08862. 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/QZHN92439976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25490148526307061c574a4d1dfa277e034c10a3afd3cbacc88fd84082976794. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZHN92439977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d12553356f11f0bf2ef52ac8ce191ec46cf44ad7a14a556e29f3dadb5c53086. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZWFG2336212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf49c2f6c6162c84dcaf03003b3580a780d245b055afba24ad19a7c86146c4483. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZWFG2336213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1bb86b6bc647134cb8f9ff71f7ea90262561be6666b3021034e2990fa851892. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZWFG2336214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f5a9ee92ac1bbb386cbef542dca56c2d55c6c4d06f91be90c9b8fca8d040a6. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/QZWFG2336215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07cd5dcad70cb8487b77c94a9338c7d972f9738893c4bf26f6d559fc061fbe9a. 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/QZWFG2336216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ead30a917fa33ed76028ef769a4cf1f74e85735683c38e3725c9f5008e3da45. Chain 2 (Bitcoin): anchored in block 960161 (2026-07-29T22:51:26Z), 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/QZTAT2359955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x966dcc087d6493c85a4b1aea9ce53ae86fb5d346ac497e69a656959719667aa6. 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/QZPLR2349608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47fd14d6235cd22f30eb0ab1aef15532029b410ad2a2f99371b0824f448ecacb. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZNWY2390984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69073f51f3cb7d215b9f80567ea3a4c910ed2ce15f036ea7385ecf4695d05cf4. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZNWS2342862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2299430ca7bea4333ebf17d8fe7fcab8cfc2d1dce5c6ed28a9d25511effb55f7. 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/QZMER2334204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b379d79837903505d3c6df5a09656e8f5fa5d0543590f962378e48d1c9ec33e. 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/QZMEN2392544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a5081e19000e82f9601a10dfa13d328537264983df6fa64112ff4ee44870134. 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/QZMEM2339497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf073619b3269ef89d613aad3ca3677fab857a09f11046e5683e1e6e52d87ce9d. 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/QZK6G2332095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678d62468fddf742efc7436eadefb18c6862aee0834dffabf649539aef30c897. 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/QZK6H2385509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x821dd5c2df1f317603d541caf4e2fdd2312bdb9c08e9cdfac8df7f5753f75120. 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/QZK6P2387403.