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 0xd1c52b132292fc2e33d51607e87908e2ef8a8ac13223e112a4c1fd190c5051a3. Chain 2 (Bitcoin): anchored in block 953973 (2026-06-16T16:37:07Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2a419e4f-3d6a-4c8c-9d5a-efce7d38fdbf.json and https://artists.proofprofile.net/proofs/artist/2a419e4f-3d6a-4c8c-9d5a-efce7d38fdbf.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 0x494a714bc287f568800cb33636398c69ebfa97b5cdc1868c34266cdedd37b843. 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/CAGOO2506792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eb379fffdf00d87b699e35f0fad8a30186d2d6d2bc44b3bce66407d0767f158. 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/CAGOO2506790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ef74b699e71b1fd66bda77c59c48fdd3cd77df95d851eb4e1584429fe50b2fc. 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/CAENV2577939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa06b14f87717adb005d342cbae6a10e58f08c648d5a78d109ebaa2f45c30c78. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/CAENV2577944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda51a2d74b9f3168fdee1d075c549c0825b5150df8ed9513d88c6a07dab34619. 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/CAENV2577943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2167d66f026ff11a4b6106361723fcb0cb2bedebe7f4e83a4e52ce0de9808511. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/CAENV2577937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x156b682aa57db9c7b4bb7fc489e98c6a2937a9ad0a3297b70ed21c0bac5771ec. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/CAENV2577941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3386e9ce6d4a87cfea1699d6cdeb92bb27297361eebe91b1f3eb0f1323a4fd91. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/CAENV2577938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb8bb2e8a2e0e59b8a803eb518832dbe938a4622950e2b62202d84f60bd44449. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/CAENV2577942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4032f897782d747d8967a238fecdd064316e26621a6d920557a23a7377aaaaf5. Chain 2 (Bitcoin): anchored in block 958776 (2026-07-19T20:11:59Z), 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/USDY42545047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x948af7a3e8d77b9a5fa7f917a02ce106f1711835af20d691b19574612b2dd9ae. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/USDY42545048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56022f0075af092355d33294fcc2b8ab201c6f21da05b4dfa3e6635707dc480c. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/USDY42545049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d1b8b99a3a6c7c41e81b560edca31543658c2c981b8c4fa0b4835dd14ba3f80. 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/USDY42545050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b0ed6674bda37f5640ff7c6b57bdd117713cbc5388508d28bc195f225f70d2f. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/USDY42545053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33d25e131ff415b0f3e948f260526712d13763a0fc64fd54eee82b9b7601621d. 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/USDY42545054.