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 0x8b1577ed73eb25706a919afd8bd23b04303ac34868fa46006e36635be2c2a584. Chain 2 (Bitcoin): anchored in block 953886 (2026-06-16T04:37:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0af8d387-b059-4ce9-a436-7dab4e8e2116.json and https://artists.proofprofile.net/proofs/artist/0af8d387-b059-4ce9-a436-7dab4e8e2116.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 0x3fc43f625e0aeb606a40812cde91f95009daa68cf8d6dced4967e97908d819e0. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZK6Q1998480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b674cf19b39521c982c6c9154d2da6156fe09161f279da280ceabaa30a8f8d3. 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/QZHN31983307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60107fe207de6b0083c294a931784ccdaa154c741f03dfcfdeeec17859ace03e. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZHNA1936205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8caf8972c0b5b7746fbeee54b558fad179cbc4924b3e6c7cabbd8a52a9642e6. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZK6Q1998481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9801c869fadf24f5a93f235b877142f3a5f0db11d3bf09d11e9815cbf6cc1f0a. 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/QZHN51951231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x635292ed72f87156b37c37b81fb40f3906651589ae5e532162f97ebbd7f659cb. 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/QZK6Q1998482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x760800f01c7c903171215804f8f8d39b541ab13a93ea41c3218f19087b9b3d4e. 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/QZK6Q1998483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe8a812eb63ae35de44ff77c499b078c810d840bbf1f02f3a4878a967b0e425. 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/QZK6Q1998484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75b9dbe1008c9f5ee78c7c8b6a16faebe7622bdb2f1117c58fd1a21b0d9cd18. 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/QZDA71915035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94dee9f96db4e7bd9aa3eb72c5aaac88c835b1a2ce76e48ab9f78ce3fa622036. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZK6Q1998485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b5a0f24eee6798b7b6c6cb30a064ef0aa6089c5a084f2446b9bc1d3ee08186b. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZHN31982023.
2016 American Choral Directors Association, Western Division (ACDA): Biola University Chorale [Live]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4220127c3a4ed0428ec8d527abcf53d34a7e3ea4ed7502cafaf746468b47bc17. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QMLLX1400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x840c2b41f917b818b624bd35442146cebedf1705a0dd383b7ed219f42c869246. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QMLLX1400012.