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 0xc7c34fb940e597679e494803ee3bea728a388fd16b03d1b68016a1e627bb35b5. 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/38a01ed4-64af-4a2e-8736-003275ef396c.json and https://artists.proofprofile.net/proofs/artist/38a01ed4-64af-4a2e-8736-003275ef396c.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 0x87eb1cd003c30e6f50c862303a1484720a2aae0650e57b4f850ee01add441574. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/NOGTA0593030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa61db5c8ff65758002f17ed2ff24b7ca36528b058e7ea4acad20b82b7cd0391a. 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/NOGTA0593110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a97d699134f9eb79502362d43bc582e9d2db2fc20cebb6991621ec9bc0ffedd. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/NOGTA0775010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e659d50b018e0da277a61257ca5ac1a5129e656caacbd9814dc8c576f709593. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/NOX9X3493406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfaa00190827757e3006b0240ba6bf9a95e106b1a43bcbd06ff9c43f62e39b88. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NOGTA1067020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e82415bf87f587044a8eb35cb1a24ad9d8f84ed5fa3897b145d54a9fb1ef91. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/NOGTA1193010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x211e254966b4fa3c9284547cad8fac93e98bd1849dc46efefcab7bc5619a75a2. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/NOGTA1193030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17ed69bbbdfcfbc1bfd024059b9fa53b77cc188a3bf2e103a4c4705e72284309. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/NOGTA1193130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe15a7464bd8d9f8abd7e3b097b9da1bb94a55ac37ee4186a2619691de70ad387. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/NOGTA1207040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77d4efffd292f540ed88a1f28f629e6770482653a07de28c7607d1bf8836b105. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/NOGTA1207070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c46d703290d31bea422dcb254a24a4903bcb3b07fdf15d4961d54cf6cb806d6. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/NOGTA1446040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2e6bf5a34ced4c87bc09121c34535005594d86ffccee56573fabccb2d2c477. 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/NOGTA1446060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0679927f7851fc42abc5fab3012665279f7e0ab2ea553a0f9b420a078c6aeb31. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/NOGTA1446090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd9320e3ff4776b34c610ff6e9440ddd7932dc593407b3d03350e501e550b29. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/NOGTA1446100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cfe10fc2472a769c1a0b8c23c35b43d1986ece3677e0feb95e85dc0462c8122. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/NOGTA1446130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee1c496a9c4a91eb0538000fce172d10889a00bc01ccbff74e82da6817112025. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/NOGTA1711040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x176ce2d3045a9a97fdf2cda36ce80f017910ba7209a9181a042fa08095c4514c. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T13:39:11Z), 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/NOGTA1711060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19c37dbf6e9008f0bde7fbfff7360513e7c8604217ca8289fed18f036b218310. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/NOGTA2039710.