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 0x82a8ddd9328c5661244b9fbc0b46284d67ef242f70e759922088b82f638f8584. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e6d90047-e1ba-4d49-aed9-0daa36104bff.json and https://artists.proofprofile.net/proofs/artist/e6d90047-e1ba-4d49-aed9-0daa36104bff.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 0x0dcbd50e0ea3af78b60d345bf2cf73ab1ac51e956356878a351e8acd15c4a7e9. 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/TCAGR2247049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9caf73b1f44f06491e3567721b71a780fda3e3c8768cfad53f55495909bba6a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZZ7L2488908.
ドルドーニュで暮らす幸せの一日
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe740509ddd4fb078ff19246180ea2de4bfd14ccf77e2d2497df20e0b3265bc90. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZES52435200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fc856e77501412f6131b39df4c786c5c13996a78a39200790b26680329604d0. 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/TCAGU2355691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37c447b70f352e0377e3e21b1131cc3a53dd6d72fa6610ad9127776add309864. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZWFR2476249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x026e2aae214c54b6b23f5ce09bd0a0515b2756fe14a94a2a3cdb6511644a5048. 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/TCAHN2359062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8bbf473192aee9f1b619cba59ed7f1fd4ff040d5cce94175f8e0bf5c3f12c2. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCAGW2371987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f2a1dada3a0e3b32420430b1059dbc49807a45e1082198f8fe79362e7e2b6fc. 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/QZES92552318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e2216ae3d85a1dbfa2bbccaa30bc98f16b23d69c6ca6d2c6f7f35b1db1c155f. 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/QZWFM2451802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c97cb981c84d5715826c9196b9301f0502882c2d5e11be197c3f8dd48d02bf. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZTBB2460311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x114422b7a99efa8977b6c8335f45e4c63559294fc85ab9b79291b133d8ec5a87. 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/QZNWS2437928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7494a220b929eab2124d5eefd249910d6910dc7fd399ae8f00bf39abb9fb87b2. 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/QZMEM2443101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x769ab647d3ea1b2c252f7b7e37bc7bf50e94e872cacefb7e1f3257821ca2e0f3. 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/TCAGO2293937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4fdf70d8699bb866893d81fefdfe2f3f88bff817cc22e7a9f08779d6692ed22. 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/TCAGH2254695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3607164399b34c3c88008c88ebfee249c8e3555b857b07b204d7099f5dd3dc5f. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZNWT2543959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe06352df410a0e206fa4ef61c15a709ca7c901d194d38382d49fb7ab68c56865. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZHNC2554461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0f66ea313a78f424298f920439abd46bab074535c0b0b8015bd3e4159a7f03e. 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/QZNWV2537862.