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 0xde242f39de73bf6a980014b43d0f9902f2d4586cf7241e4b6aa3ecef29316a47. 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/e40c0089-4604-4698-99a1-0a1d13592667.json and https://artists.proofprofile.net/proofs/artist/e40c0089-4604-4698-99a1-0a1d13592667.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 0xc0726f5efdec384cd19addd799d3559d3a10ec7bc3bb5f788e7377edbfb49a84. 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/QZK6L2203543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a85ce8af13e0b00cdff165748cdac5ea8d42bc39dd798318b837194c267d192. 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/QZMEN2331190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a85ce8af13e0b00cdff165748cdac5ea8d42bc39dd798318b837194c267d192. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZMEN2331190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3e18bcf2329ec827ea562d3b2511f13873a26dfd1ee2023164eed0b7e613429. 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/TCAHK2340019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e621c5b59615b749f226fcc3029e4d515faa4c40dfb391550bf12d897d9e6a. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/TCAHP2325586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e621c5b59615b749f226fcc3029e4d515faa4c40dfb391550bf12d897d9e6a. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/TCAHP2325586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa00879b3a9351dafa39c145ce51cfa68725ea674735807b2269f8643da12a2. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/TCAHQ2303268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa00879b3a9351dafa39c145ce51cfa68725ea674735807b2269f8643da12a2. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/TCAHQ2303268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x338c53c898a7dfaf9827cccb29b284974ca5623be87db41ccfe7d90891c168d3. 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/TCAHZ2416435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec0fc4b306710b1f3ddad87abb617f5b4cbc38b3e5eaecb3df9dbb3fe1c8d074. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/TCAHZ2416467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x338c53c898a7dfaf9827cccb29b284974ca5623be87db41ccfe7d90891c168d3. 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/TCAHZ2416435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec0fc4b306710b1f3ddad87abb617f5b4cbc38b3e5eaecb3df9dbb3fe1c8d074. Chain 2 (Bitcoin): anchored in block 958658 (2026-07-19T04:09:09Z), 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/TCAHZ2416467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df77c3ebaf03933c8c9149efeac7a94f46463b7aae9a9acc53b5476260cb8a9. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/TCAID2419735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf030b0823520b40ca665304c62a9e10f1a27254fa35c9e5ce0f63258825accf. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCAIK2459519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d1b5427528acb4c1965e66825e2609d75daa23f33b4e6ba8d3f581f30c2377a. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/TCAIR2492612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfdb121516aebc7f8a297b37c71ecaca22afd1c2c4304c25ccff008e9170e015. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/TCAIZ2444917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfdb121516aebc7f8a297b37c71ecaca22afd1c2c4304c25ccff008e9170e015. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/TCAIZ2444917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b421eeb380effad325eb98bd85ea03799e50c9e0830ae899398b9d5a3077180. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/TCAJB2442830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c728ae5cef590c38077a719e3b61087ec42f80e5976310ed1cd2d185bc78cca. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/TCAJJ2549928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeedfa2f41108ad5bd4f8f1913bb2ef50162233675d93e0d49f2050075b626011. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QT65X2571362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc7130dd8197dcfeb057c04cc267abdafec536d5e1d9b6388a6918d2c5d1d2f5. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QT65Z2592650.