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 0x56cb89e7d0242f1024bed6cfd0b934cae0f0dbb2ff7934a340483182b49824cf. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3f1a6eff-5539-407b-8f27-ef3e52d6c8fb.json and https://artists.proofprofile.net/proofs/artist/3f1a6eff-5539-407b-8f27-ef3e52d6c8fb.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 0x193114b71dc8adb246e3e25d699e8d7e6d0f0cac8c69acc388201f9147f2cc18. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZDQH2269969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x230b0e77ff3bc93a5e3680486d5bf44064cf4f5e70c74fa220018c1ad389cb95. 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/QZDQH2360473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d04b6a5882755c5f3bde2e00650613079a9d9c9b542e453934fe16e77989e1d. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZDQH2360939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e90b19c413633b55f43933c8bbce2324c34055a6e68c24dae1bb15b02ce9410. 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/QZDQH2369926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a754e97072497a395f9e46560769a912bace1320c6f5fcc3ea9d9b3daffbf4. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZDQH2375715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea0bac966daa3e5bce2bec5af7c60b65286d4263d7d8298289c00332ed3fe4b2. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZDQH2377969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2016766457295c355af8880388c09bf0d7dfa01e35fe5bf766b8690ab85185c0. 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/QZDQH2414242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b4e35868d2f137c328eb71c055bc1b8d735087239ded490f5c5f3492033e206. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/QZDQH2418503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a3a204e41a5b2a81c33d8ace4e9a0b61bb0b4daa767b953c5eda4929000614. 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/QZDQH2432106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabdbb9fcc6475583c874aa092ab6a90d8d69340d97e9410e2b210f62a6204408. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/QZDQH2435221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fcc75d3bb0f27a6451f0d5c3c51459676606a3da01c0961dcff7ea41dbc5cfb. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZDQH2439090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1042645b13ed9a92e18503fb9b70ccb508d526025021bb53110a3d7d9d926df1. 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/QZDQH2445739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47fb23933cb1a28254298a06631949434b44f4cac46626bf022bb5957628f932. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZDQH2513510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7fc665a0fc73597c6a704d6c8f04af78363acf25fafe9e54c6c166207326ace. 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/QZDQH2533649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e88825aca8085995392f6d9d4f3561c6d3b3ae2f0f1b5b6b5ec9b20450d7574. 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/QZDQH2372420.