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 0x4b06099750ccf1c41f989c68e9664c163556c23aebe065f007bae83eed3d9216. 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/0a4522f6-2879-41b5-9b40-c9eda82bce82.json and https://artists.proofprofile.net/proofs/artist/0a4522f6-2879-41b5-9b40-c9eda82bce82.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 0xc09b332ddd8cb92e95828aec7bf6b3a9181f24d1091d5ca3f2e5f8e2f4f2d304. 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/QZGLS2449267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x983869cf69e57fc18f3451519e85953a90537c523ea1705f6ec8e262b961b152. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/BCNWM2400034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa668d0dbc116c846fd0dc83116c8375744cf6f0f3656ac5619072d319c6f5922. 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/BCNWM2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b2008cffb188a55cb044388ab101660a0d78e0ce78469336ac103c289594c23. 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/BCNWM2400058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x888b37b7e720a46ad1e52cea7a4dae9d6a903edc43d116be6a18c4847fbfe1e4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTV32416899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc3a9343627e655e4f434e7e152ccb0798c97725597cfc480d38b07ba9ea94c. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/BCNWM2400050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe38329813ea4012ac5a8e49737b15217847ec0831faa0b8276521c785fd9aef2. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/BCNWM2400048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b788b62eaa35ed8a1d506d66cd419a539151e228a3a8f5baf1af007e371fa45. 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/QZTRX2444698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af973d9d0da20d6505699330dd532331092def9cb4560e475d6fa3e9e7d8a75. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/BCNWM2400046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4ab75c1bc5bd0f7445f886d5b746e0f42bcebf8567f7869be7e52ea10dc667. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/BCNWM2400037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf14436fe461feef5e254899c4209d7aaaab83d8d873cc402eeb016f911f8d8df. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/BCNWM2400038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74e4f6d1d5e1a85b74da62c330431d40488d2cc93f5a4bac68daee0783b4edaa. 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/BCHFD2400042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3889e2c0d25f3219416f827b553ae00bab4f58b208f680ee46d7ca8b546897a2. 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/BKCMX2400095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85bac281968be353b9661b525398524dcff3a7b85e9c7880910307f4b2bea36f. 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/BCNWM2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x759920fb8c8dbc0b154f32d9bb1c066a749d48f98f1c522f9c9e1f743d9609ea. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US7VG2460968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4008f432a7a4069b80a7ec1e3de24947543019ddb625b27f8c0ac32fcc663bd. 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/QZ5FN2432737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25761c9ab4fd4059983ee1b166172bbf8a3ca581da9f6b4f54331a4b1934c8ed. 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/QZZEB2303418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfed41fc036dc58b9bc6910e59feba0f04e2e872266517154470eee69c184848f. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZW9K2371572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dab0cd9679033819c512a9b22126897dad622208631445b2c38baf1ddb36f74. 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/QZWV32395321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47ff320d745c6d90813c8e3945b8ef8b6c9590176b303f128a82772f107df208. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/BCWK42300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb65d7a68ccac414adae8ea3854537c898c0fe7ae255734ac8660e7081c81e975. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZNJZ2347429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e7ec9f0667fe89d5d4874c9c919eb7cfd8767aceb3bee288d4a59881ecd6167. 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/BCNWM2100150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03ad4ecc8141bed50ca7fa336e2f4ecefc46ca7519283a14c3dd670f6ac21c37. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/BCNWM2100133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c42f0cfca8607de86b22ac913408d3cbe9f50cf25b01d2d6257c5e9ac26f108. 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/BXTRN2300310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264b0c44b2869b766a9529a6180a9f483ca1a098e309f26a0ed12a21012732bc. 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/BCNWM2100068.