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 0xff6ebd639790878060b2ac330488c9692168d9925aedfcd750a2cc17c6b29be9. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/349b2146-1c1f-4567-8934-04bf158d1e07.json and https://artists.proofprofile.net/proofs/artist/349b2146-1c1f-4567-8934-04bf158d1e07.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 0x22e7255ec5b030f7f63c296d8b8ea0d556ad0bf5e41a4b6433918945437c1dce. 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/QZWFR2341431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c75cf54615776c8fa8ce926df7e12f8fd3ef418c7cb8c72a445deb480cf283. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZWFR2341433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff12fa7450bf27e0a0a321a5c3c61310efe1fee9d72ef2e5b4401ab2e684339. 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/QZWFR2341435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f22a44d4407b5addd97bd0492bfe00a2af0d394aa07fe2e52d36f3fd8c23b3. 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/QZES52529724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2439fcca7e8c5907d38508a0d922d75d90a4db5980946c841dea90469dbbe634. 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/QZFYX2596114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb20cd7daaf35c443cf29e6a5e325f0c0a252a627aa1fdc5c4d410c614fce2989. 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/QZZ7Q2411630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b08c425bcf318c2d092f1caf0cd62851203f8d28ce1ccfcea76ff25c89860f5. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/QZK6N2433935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91ead804ad3c76cd50dfe85ac8e9a5d728697e18384a50dacab41ece73f05106. 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/QZHN62405657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33322a278a4acb38c1e027e402f4f9e4b00748dc07156946540334d1eabc0bba. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/QZES92468445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dfabd1bc087577fe1cb01bdb30bd5bda81bf59e0eed66ea3afee8f29cd6d904. 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/QZES72405781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5062e98491e76cd3bbc0eda2466ffc9cd283c5c8f4995b4dac2ebbc1511cb0cf. 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/QZZ7N2479747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa7cbebf3988b17bdb01a81cb488d87b6ce09980b581637c019fa9626d49709b. 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/QZFZ32428292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1425fcf5a9f452506ced72a5fbff5197e0cf99dc4ddb3eca720b0218663c50a8. 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/QZWFH2356437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb938f68db47189e642d50efe6d27b4b60be164c3ed7f26343d9cede34bffe75. 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/QZWFK2302223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cd9683ff603f64aa552aea8b74994570197a01373f586b47d63f7f2e7a0677d. 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/QZWFK2304341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d0277083b6f259cb975afc144ad04aff17a29db1de4b04050d52907e51c5a80. 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/QZWFK2304343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3467c0d1890beec913be4732c20578f7ad4e27b89b05ca9bcfb00d48ea04983d. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZTB92389193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dd0ce770fefcaa2a9cbb72db2e83bfe07ee1b33c8429ab1390c292ccaff4124. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZWFK2304443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d93ac2053e8dda87f24233521c7011f98dfdc23b8ece05db54f7ea3eac08b5. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZTAT2388609.