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 0xfb72f8c2b732251b4b6f7312957f947be1a3244d23eb14e5ee9f534bb57b6836. 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/e35c4199-6f48-42f1-90d2-3562e1c2f92c.json and https://artists.proofprofile.net/proofs/artist/e35c4199-6f48-42f1-90d2-3562e1c2f92c.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 0x8893e1ac61a018c32ee287998563a072f4b6b492dd905aa0a1c3b9e9dfac0a2f. 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/NO2DY2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a4b4c4652227867067843f4dd8ecf633ca8f76dd91a3173353e488c9d5f6503. 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/NOFAD2005010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa44ac41c6d7724de9aeee799dc0314c471cb5205efb02e14948954dde34c3dbb. 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/NOUM72000190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7639ef46ea07880271bdc37221dff6ea680628410735f4510d5f48ed7a42e8d5. 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/NL1AP2020037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7bdcdc6030b42da37f54f6b7e1c033e18798832eed423721b69e502f9ba866. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NL1AP2016167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67e3b3da2fb6f6b66c3934fec739dc37b0585e8a79a335e5747c0d516e1070d3. 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/QZFZ32047913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b5abeb1b868013c6bc8894f74ff13f976b5a6dd73d42412dd5a3605329f517. 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/NL1AP1973660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d4012fd527705e59145dcd3feab1a764c05a01c75a7738113e57510a804970d. 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/NL1AP1975174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf7e89045c6f4678bafa137502b0939bdfc3a4b06b8b4241881cfe89ac103e3e. 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/NL1AP1970620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc00f6dbfa37ff53dacb0fac1eb49033223c6e0f61f1766bb1379a46e72ccd78e. 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/NL1AP1945177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151fb0a21373b49c1607d1d6702807113f70b58dd808a8816241dd1f2afee605. 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/NL1AP1928391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8645ea0e0be062e1481d62045cfd3821005f57ab02911c148ffa8d34abb5638b. 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/NL1AP1921385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x286c75ac40393a509ac5b156fa30aa8b39a36491b7b723a3d812c772af8a1f86. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NL1AP1918977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbddf915ca92871049179cd6e105ff2f65b9a51a6e44487959106102af65d9468. 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/NO2L31703010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24427012c012a3391a612326527163d1d41f1fbe3cdbab05812ed958a383ab9c. 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/NO2L31701010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8c836d78dc9ebd169d29c5e1003b11518bbe52319aed70ca212c51c36dd47a2. 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/USCGJ1738774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0b506726b5d1cdbb8430d8f557ea43d956695f95cd34c3dd276bf7ed81fb26a. 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/NO2L31602010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55dc2529cae9126ffdb4d2edec94b81daa83e5c59fa213ebb61de11fb2406ec2. 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/NO2L31603010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4589df921443e44858c8064ea42193650694fb664f7ac35a7183e9ae5b24f1da. 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/NL1AP2013244.