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 0x25c4051662a8a1588b693a248b8f40675cf7952b12c8915e6079bf3c087252db. 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/a8076818-338e-45f6-93ad-179a84a5b1dd.json and https://artists.proofprofile.net/proofs/artist/a8076818-338e-45f6-93ad-179a84a5b1dd.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 0x9effe0275c6cee642bd5ada741c8851809d2b13d9fb5ba12c36ebee3ddee9c03. 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/TCAEQ2022382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x944bb368e1a7a713d552cbd6052c8d563c03693512b54ab11a1090bcb9c85d84. 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/TCAET2076506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fcd3e7efcfcbf9117df210696253b31b4776a6bb5ddb195630f4fb85d9d528c. 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/TCAFA2098987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x620d4e23b092665b7ad166897c141ea6e5724094cdd182aa36eb0328d53d87d7. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/TCAFJ2150810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x122aebb08402b8055f9dac85c1a0dcadcfbd84204f949a93d64cb3de82c13eee. 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/NL3GQ2100273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d1af99e9121bb3ce700a7908e9687b0cc5838d96b1be12c51819637bcdd3fb0. 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/NL3GQ2100344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1435dd923a354a59853b07eab234b23540ea033f2ceeb51816ad8cbebe094a16. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/NL3GQ2100411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd00a202b340b3b228c94ff811644e0db0afc5fd0f21e3a2f56f97b3fdc1f34a1. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/NL3GQ2100412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x031ffb7ac0ec281ccf036f6ea5ed3bca320ea6fe26ac600389ce3643aa3c30cb. 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/NL3GQ2100406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d1af99e9121bb3ce700a7908e9687b0cc5838d96b1be12c51819637bcdd3fb0. 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/NL3GQ2100344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x929c87da360d31dd13d09176f44a5e1a27d0f2e809dca0e5febbb57466ff8b3f. 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/NL3GQ2100415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb999437016fd23f00916f07ced5ab305f512545ebf77382c99a662428b34fa43. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/NL3GQ2100417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e20a552df53c97cfd6c26732e8b532eeb2459f78e090cb1b4aa8e3dfdcd2a1f. 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/NL3GQ2100419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06dda6df5c27a1c633476714193f51dfb145664de2f1781a5addd4c79f1e2d41. 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/NLG662400168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b5e465d64441bdeff604f14b2d5b74dd232baf05d379ce674a9c9b5e3634721. 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/NLG662400308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c895a0784fce320cb69a287fa3b82585a4876d8a7c495b2d5a4f3a29f7bd047. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/NLG662400250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06dda6df5c27a1c633476714193f51dfb145664de2f1781a5addd4c79f1e2d41. 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/NLG662400168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d49dac7e110d40b885166aa8814d9f5b15f4cfd24232372f601c83663400593. 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/NLG662400078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b41aa48605dc1abe6704bcf6a1d5f73b19afdee8010f6e7e1b78f45967761f0. 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/NLCK42234389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x489daa8cd550b47372830e881300731b9e401cdaeb04c42b14a56609a6a338e8. 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/QZMEP2443432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x768e33809bbb6fcab0a9a6fb34cbbd6d7e140d0e0029062b1f1ff9340f227b69. 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/NLCK42416679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11d6f7a4e803e8b4e6bfcc05f18f4a9304a5ac3640bba50285f1a8ef7408bcae. 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/NL5HJ2400146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11d6f7a4e803e8b4e6bfcc05f18f4a9304a5ac3640bba50285f1a8ef7408bcae. 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/NL5HJ2400146.