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 0x7f65ba85bef97178ed7bcd089ae53a3fbd98b84a863c1fb0472fdc4308309e17. Chain 2 (Bitcoin): anchored in block 953854 (2026-06-15T23:16:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/02741f25-6771-415c-80bd-24a6d183b351.json and https://artists.proofprofile.net/proofs/artist/02741f25-6771-415c-80bd-24a6d183b351.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 0x72b6ef4665f085a07f2e316f3a7c0a48219b31e89eaa38c3647baf0de4d8aa01. 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/DEH742009364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de36b972bbaa7e3d84a7579764aa84e81146f89f45013d605adaabff1a76692. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FR9W12220142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0528313078dba4ebd0ac9c864bb4b920d94daa5094617f196cf2bbb500427eec. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FR9W12220147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a5ef3e0e958e90593b20de162ec52e6c2f005fe7d674cc203e80f4fb95de794. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/DEU672300140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1422349b58e034fa6c4ad65d0f5fcad332d3011e7caa888792a7c571dd6e7b61. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/DEU672300141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22f473e2d5db2ce27aa9da16fb1ab6989641fa3c07f616f8bd82557746226995. 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/DEU672300142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x654ae6cd6177bc070ec78ff292322219d808db1ece00568d59615562d09ea617. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEU672300143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b8251207b8e82d5272967984a43a139ffc58316e76756280eff94aa5f1b6da2. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/DEU672100672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28ae391fdab4bf570e37d104de6d49f46f22f93a8a4ca0136c9d9638ca78603b. 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/DEU672100674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6328aea8522f39340e9f43b3ca7ed3299a7054a9581f75b1a5c9c49ef6da898b. 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/FR0ML2000340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ddb50e502929a86afd54d820da24a50184c6c910eb7c3e281d50c9f956c90d. 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/FR0ML2000390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe45608e7bc43b3c166bec79a32c5eab56822c1f0d24879455a43e5a7eab9cf3f. 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/FR0ML2000400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbddda6d9e6952b5b68dde3ffec3214d02fa4e67c3260e0a30d1678d85e6befb4. 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/FR0ML2000410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b74ec3fbf13aee3d34ee2e4fb8112ebeb3f87bc182bbfce9d2bf089c990c10b. 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/NLCK41060818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ed201d1df2e342703bf533a21ace0282024077b10759a2e03d9aa4cfd6bcfcc. 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/NLCK41060819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x157e31e786622f882ea65b1c9ab06bbfafd66d491bd7fdf0b711cf4792de1fe8. 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/NLCK41060822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c9d23c7dbe6e8d5956d5aa1866fb9bf869146d254f81c7aef636be6a060060. Chain 2 (Bitcoin): anchored in block 960355 (2026-07-31T05:49:18Z), 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/NLCK41060824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1faa3c61aab27bb78db42488a4fd268757253cc9c9f602c3750b0470952b56a. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/FR0ML1700460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e1a2e408f10249bccf5607befc0fcdaef8b8deddbc25324b59586d8731a848c. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/FR0ML1300310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x089776b7cbf524b80955935f56d4b56efa7dff0516c43a6a8b46881bb98a56c2. 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/FR0ML1700480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2300919d0053c133f982ee62433e4feb67588a509084bd50d9628009421e413f. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/FR0ML1700170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62df83f05b069f3cb45b8aeb840f40442cb1e809cde9ad33f6426a8de1b4d1c7. 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/FR0ML1700500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb28f532c8ddea0e9b7663b0382981dab73e1a9db95c12bfbe65c9bc29ac652. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DEU671704336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe684e3843195e8c6baa38886facc25dbb8a57bc00350d1b2d440f537b7cdb02c. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DEU671704711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0c7ae4a0deca6bc9299bf22eaed82e4c1353868ff41934970a2745f80b44731. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/UKT962300008.