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 0xf6993f5c81194eb3896726d6604e1f04160263f11e7df53b17e61a0db8ef7820. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8d1f1854-efc0-4c26-9d49-f7764d1ba35b.json and https://artists.proofprofile.net/proofs/artist/8d1f1854-efc0-4c26-9d49-f7764d1ba35b.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 0x63a1df021f7b9e39476494d03cc06195d666402d5c92d08348f10355b89f5988. 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/UKEX32434332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x000c4d11b4419251be4ffe2d6bc464034421892225852a4645c9886bbb318e2d. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/UKEX32434344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa011b62c61db8597359fd4990ce8fb0f13ce67bce67fa92e2537a3755e8663fc. 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/UKEX32435266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76dc28ed6baef5effbb4ed57ec918863c3d77b53ba802c432dbd1836be99b5e5. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/UKEX32438230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd18871085277f7a123d40d4d6a81f1a4d0a005942d654e94e3373b056c5733ec. 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/UKEX32438231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaed67d13a7535d6b728b500db2d3a14cbc68993e7290af22081805e727684746. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/UKEX32438232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba3b2ee61bddc9ed398dfc3e5094769d6c3d4d3688c0a3273f03b6524d2a43ef. 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/UKEX32438233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf98caf2fb89541715a8d096b06b052f6028291794dfc72318c1db7fcf8c18bc8. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/UKEX32439837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d99476d3899781542b38cc9c719d1c5346109452fd34cee6fd80a446769c20. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/UKEX32439838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63789a337aaf6a175bace094d8b9a6cde47ff9fdaefdf09aa97a80cc1868b5fd. 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/UKEX32443095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b85e78a6cc6f338e0d2f10395b670a3d628ce327a641b8279e6d2bd1a76553. 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/UKEX32443096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffbe436cde4bae1a1ad83970e593df862c04c2fbe6d82c20883d7373b944c4d9. 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/UKEX32450695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48255523acf2524a4e2f84770db0c8443c0d238791c0cfab1477900ef0481811. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/UKEX32450698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eba1b2a7432a8955c7f4a6c5329fda2e42c4151b3393034d0e2761f4a9b33a3. 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/UKEX32450993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f4e547c5143cd1218f66ec2d086f9ab2de2a74e85e251b02c3f775e20af04d. 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/UKEX32450988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11eda43448a7937a165956cd293dae7909ab7fe220280cfe68e9042270baadb1. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/UKEX32452460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x929c3c698cfd668eaaea338521cbeb39b63e947ee86d1596a67d8a563cb5791c. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/UKEX32452462.