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 0x42d26ed64338ceffb55ae97000d0cf7165d66de724f17d138fb9a160b6c19eca. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2a08f1a3-af12-45ed-94cd-b772a81ee422.json and https://artists.proofprofile.net/proofs/artist/2a08f1a3-af12-45ed-94cd-b772a81ee422.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 0x30b6858504de2348e7f7c6da4c5460b041a80598429c8629861a10d8bd6d2fea. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/TCADF1785629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc344a09c67e31d0d17b85add483eaa848c121e74e70f51ec81f7ba8cd0d05fc0. 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/TCADI1717090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba6270487a81908ca17a911b2378ce77ae9f2a1f8d3b6c675f621b3643d4cfc. 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/QZB4J1847600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x048fcfa46b3a3930b0dcd5749d378beb02c3c536aad8b765f94c7fae59a21103. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QM24S1826871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84d1a0c5c96d3d9ac0df0273eb275223cbc8e41c8b1051eb64ac7d8824586df. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QM24S1915181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08950c2d7c5ece237987f8aceb7726ba6aabdab3073c8428cddcd46071b99786. 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/QM24S1915183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e262e2f37dcc51b4a64a51955a16abc16113075d4485d0fdcf30edfc13f8e23. 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/QM24S1911400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d8278bb0160f0176a988ab932fa89daaaa85d2e19de2f1cbe5e229daa1f5e7. 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/CA5KR2241691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d37ddd7509536d207f1cb169486fc4f4c02939a6b6b8eb4a1eeaf9d0d39f9ed. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/DGA062235782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x655d1c2da75874bdcb03ee45b6fcb6c8bbcf158505a27274c36bab028cf870e7. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/FRX452479810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfceb4b983d7707ad547db7da5343f3441892ba95e4d8badeeac2b5421c0e1833. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), 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/FR10S2509103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f16310f198702f34e1e40e691996df92318657725bc1935f6a7ef855fec5358. 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/FR2X42539822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x514c1957a950f099188c2631ab9153cadd7fbcd7237f9b7b288ce19e5454edc3. 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/FRX452526479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5515528b30821e562a5e2759bb0c4e0791cb8bb12215787fb19abcc1991509ee. 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/DGA052511086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36ca7c733b7f646f7652c673a67866bfa4c1e4f6155d5d543fa6f45d4d79b1d9. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZTRX2357081.