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 0x7f0f7c974b64fd569e72e424f938d503a73d6a4370c9cf4504332c7815ca6f11. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/89cb83c2-1ae8-4317-9f21-76e3f164a35f.json and https://artists.proofprofile.net/proofs/artist/89cb83c2-1ae8-4317-9f21-76e3f164a35f.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 0x87d6cc41e3103094862a49f5076c0ad89dfff9a7f989dfad029b452207d77aa7. 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/USY252403758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4470e788a7ca19581a72667278f43fc61ec8a01337f675cf8d2f1b6ecbbb3eb3. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USY252403759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3be27b4a2fac595b8537a0a72a673daead64938b1e3aa90f2e99ee0e78226735. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/USY252403762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x254cd708f153c54ee3d0510827b280534a190a2c49f67cc6b9b7871f85a0e6f3. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/USY252411043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb119fc7859b85f9a9217ef5527bb2d001b3fef6aef6afce25b015015282b0769. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/USY252404854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf67fc2f943f8bba4923ab2ad346fbf2904d410c548783cd9d28520e98b27c434. 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/USY252404865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705e91d5d96265285e677ab58d12ffdf073686c215b474c4c7250336a730dd3f. 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/USY252313170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x971b1f638ff98ccd3d115600d4d41916a5ee9a541909010fea61000149e2bf90. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USY252313171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20ecf146d919334a29a50e2852773cab2e7b3fae39aefddf2fbe7a76dcd712f4. 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/USY252313175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f64e6ac62c3d0efcd57044062dac625f69a54c0851286d96ccd7c1db10bb9f. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/USY252332691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdafc2efd86d79e4bfef9b9964c527de62d351ccd53ba6f4ca6a67b79e2bef3f0. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USY252332694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb15afcf4eb73b1c0df98624370434e38dab9b65ddadb30783e601d303c4b8866. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZFZ22400683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdcb15469723a8d27b5d0cec62fbfd9b1f4b5817db28751353c5663ac5e29ec1. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZNWY2460034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb02c7b1d7e1f5370b5697034a94dc84b58b446312616a455ae3590703eafa8a9. 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/QZFYX2387084.