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 0x093406c2ad0244a0cc1d41af443429d7718b14469807f18019b7b6ba7920c3e7. 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/c2621b9a-771c-46bd-81b1-9199307640d3.json and https://artists.proofprofile.net/proofs/artist/c2621b9a-771c-46bd-81b1-9199307640d3.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 0xf1894c5a768d6f65eff70efe522f416a56661158c320175d5a5881bb457f64d8. 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/MXF600600170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7423d44dd8daabee7b4555292e0de0b1bde38b07cc47b4e08a2f19da61d2d9a. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/MXF600600310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb486d360dbd9c886e079d12e94b93cb1705125f0bddd739da3f63097b764461. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/MXF600600617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc16d9c104b2a95a16f3b6f3c4133cc6864b0942b0c9fae597f2732369dfdc3b2. 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/MXF600602835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3654c698f03fa73c50e7fd873c46cca272b3f9221889638ad92e214d993e90dc. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/MXF600700009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e971729fcd8d1df94569cb5c813bba4de998e8c08d65901e86632afbe8dce2a. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/MXF600700013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b462faa44d1123e38122acc8ed28ca22fabd8a38a9a38d230ad857d3f45026. 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/MXF600900724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4413b78d7d5900d4f4296f55487399e54123ca14e1ebea2729dd49a43aff098. 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/MXF600900725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a1b72759447a4ae90b4940976cf33cb0b95d2819e67ccdb2a66fb25cc7d658. 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/MXF600900726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9261869a0f5264e04d73175413388f00df1bfee261a5563d1c0af357bbfa798b. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/MXF600900730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bec6f41a2185555704d28ed0433c9b5bad491e45c86f250df72078975fa3012. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/MXF600900734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa42cea44d110938b5c012b6e27968c36c9a422630e90bc8fe187b0589b3065c8. 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/MXF600900736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6b65b34c2966394c13729258c7c42f7b7e5475d4ba179c57c1da20b8febf532. 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/MXC441600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b2af2c6bb6fd9ca44fa939b601c6dedc1b2f8ad668b88e3c908e27980d29ab. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/MXC441600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaffdf165174f3f62e2659cf23813f0a01ed07eeeb2857bb8674f62239a3f321. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/MXC441600021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f5e8199db8471c9a40c53bc422a35d183f133a1df10fabc4119861efbd175f7. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/MXF600600264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e63d3825d98c871c154af7aeeba56718865da4367c6b893675e37ce3e380b96. 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/TCACN1665223.