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 0xd65692e66e9d57e4a64df63cf9803159e12ce8c538ea08e3c1aad2467ea4a611. 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/451f71a3-5f9d-4420-b0f2-18d00b038ee4.json and https://artists.proofprofile.net/proofs/artist/451f71a3-5f9d-4420-b0f2-18d00b038ee4.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 0xc363090852aab48ca1cfe2f2ba97371e8a0ffca6a7159bfe1e1a73183b40fb78. 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/BXIV82388185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x136d58e86ac586c8da2076b4f5f37dfe95b212679a7c5a8a961df79e4940c6a9. 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/BXIV82376701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a71d5ba861a5e8375f77642e068eea067141673f71c64d4660051b7c76e13e. 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/BCKKP2300026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cbebaa13e903201de8e563a940fefc2744909f1ca05a74cd2acca559118d0e0. 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/BXIV82311657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ed157c6adf18547009432e9be57045c724ecda1b4adbc694a8bab6d1d360d77. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/BXIV82389001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e84870881fe1765440173fd6ddda09ee8fe48e9b44d91a8124ee7a42f75144c. 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/BCM9B2300420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x445752b0ae105415a82e7fedd0032b2651ba61e178b575b0e14edfb0e6953400. 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/BCM9B2300452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70ae277bf593b6af002a39dbf1c733b254061b0b67505a1c81e211a7485908d0. 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/BCM9B2300453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x922755ba90ee9c0cf40e2255f058528da325579fbede605a80483ddf463c8256. 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/BCM9B2300460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaf1408c1c1669c2bcaa6285fe79d1e6f0a12b35a802a4a548dc8a29eb7fb1d6. 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/GXBAV2460990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a0ecb1bc7c0f07940e4b7172a17412a2a2d35cbf14d27d735f9c66be92c0bfa. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T03:10:59Z), 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/BKVBW2500320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2431efe7aca294f5b8c4c1704e635482a802256daed251d64dd53ba6ce367a4. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/BKVBW2500569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2517e99cbe61815a370adc86b1425683a2cbf9cc8733f09186caa120a2e1336b. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/BKVBW2500825.