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 0x2b4fbd6e68f949d7b65852978951b75a97796c572b1df78cae4020a352f9e714. 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/a33fb269-4b58-41a0-ba4a-0108bd5426b0.json and https://artists.proofprofile.net/proofs/artist/a33fb269-4b58-41a0-ba4a-0108bd5426b0.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 0x2cd78c226c7185cd193e317131cd3638244491b5455f74141a5342a6074ad523. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FR2X42316534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca9eb9188dc41d312eaa571cefd9e6a694de0b4077af0ac87766389636915f03. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/DGA082355086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6fb0c3ce28a58626e1857ff36718cf58243d0c838278c035894e58c0cf297bd. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/DGA092355089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x786608e0bc67617d4863f9e7fbc26a7ff5cbc563ba4d736b9b0974c5a621df3a. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/DGA0R2311716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcccd9315a03110a94c5e10d6942ab3bafdb9b00c2a752331b1cf7e944f241017. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FR96X2471775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f394da68113f7d0457773da237bbd944e2f3b5b3281f5bcab88b9925e21c24e. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/FRX202458448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6df0649538d1e1a43240edfe826067fa324a94932ad4b5b1baf0d811df158291. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DGA0L2469941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6d5e26683c391433fe6067e2464149e1afaf697f003fceb3b5cfc4ae6395b72. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/FR59R2556186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a802aab7d55d3079b9053da52dc21b62c6e3b3501f895dc9cb1c2263b289c62. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/FR59R2556188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa41e1ec42291d065353907d85ae2fe79c646d9ded7bcd66131710ee5353955ae. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FR59R2587028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3dbdef2456d67401d7321c2dcb01dd8e26c6092be1f9e97842ffc3e640b7eb3. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/FRX282555628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe34673556d6c29f26e5c520deb76e36347805bb234f4cefbdd8200edc940cfd1. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FRX452504966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d412c0db827611659b711434de5e9dedc2052f61a9d15dd57f4bf5fb9cc2dff. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/FRX872599050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a12b79bd6055d0db6b17456dc489eefc55bd3408947e7f355a990b0a0dc851. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DGA052501913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d10e8b8a2bf534421dde8817a1c2770de0dc9a06e331b0a691b11b81ca832d8. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/DGA052547197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd78c226c7185cd193e317131cd3638244491b5455f74141a5342a6074ad523. 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/FR2X42316534.