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 0x8d635cf311e62b0bc1322df128154d5446b4f7b0a4ed342c795a67e234990fc2. 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/9e6bf9b1-17cc-4b40-83fb-845c2d658cf6.json and https://artists.proofprofile.net/proofs/artist/9e6bf9b1-17cc-4b40-83fb-845c2d658cf6.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 0x814dff5d5bdfad51e826018d230a5f68a1b077fa169f7cc6a850777e8b69b2b8. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCAFZ2131025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfac921e9c6f1e369269f240ba86fe6fca5d7c500ccb953f2444a08436bef349. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCAGE2267443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf85900e75405c53a4c445044e3de4e4b7a34b26cd12e8f45c55eb7f3ba9fc54. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/TCAGG2216391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f913ed63fa4349c1d3e9f2b5b238ea7ef17820df2a4b148858edc995f77441. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T04:18:35Z), 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/TCAGG2298964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa43192ea8d2fa10a52ea5e47fd0a64706e18a0c8dbfd7e346a40845838ab10. 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/TCAGH2299005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e00cfc4f223c4c9a898996fa7b9ec53d34cc010a95e42951ea9e1cd6c41b76. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T03:57:11Z), 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/TCAGG2299053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc0f422ebabe36fc4948842716913202fdc7f38100e7c1a913de119140ac6e6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAGH2201490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94cf630014333dcba348ee03084cdb9babed2db10cae0e5c0802c4d77cb6a70b. 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/TCAGK2203503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde2573d7666ed1647b7224f5c9b7fbaee21f75acffe193f8fb1caa1029e915ff. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T23:07:27Z), 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/TCAGO2230993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf540a25ce617afed44d228ee3592c287849ad67299490196a47dd9113ebc8510. Chain 2 (Bitcoin): anchored in block 958660 (2026-07-19T04:21:53Z), 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/TCAGO2231005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x997b86ac41f996d0aaa2625489234b53a09d907ba41364bf51b00d12623b4916. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/TCAGO2231024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57ee5b6941bec1b2b984e9dce114b5fd2997b8dd7262a72290587b50e852735c. 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/TCAGO2231052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbeb5337064b0ec805251c4cd87a10a86655cc8f02205095c385bc582070c9a2. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/TCAGO2231103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d0a4f649f7ffea7d69b2716ecb2b4d70978809d10b10aac2c16f6c4ac6a91c4. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZQAY2336976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabfcf8fc785fb155c5a83021cf36de2f6cad22d2dfb76b16ec64e69c51232f12. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZQAY2365519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcee4ca8a89423fa3c72a67e4a46f5dd14d5ba15ee439ea05fb67cc363e3c4c0e. 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/QZQAY2379225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde4346b63e65d05bfc099833b2eff9c572a2507eaddda0a2c425b6f77587311. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZQAY2330421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ec1bdd603e90168bc4efa1fe35267e36800d32c95df61e8ff3ebf78ebcccb2. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZQAY2315920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x034314be36be019b2d8b8e08e1e89d39697ae4583e8256af2757093410e91181. 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/QZTAW2203216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb42a282e4eaadb861aa8810c35e3771059ee8d6522e03762b1a4b217bb57b802. 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/QZK6M2340209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa328bc2e0481c350bdd6c045edbd242bde4dc78a0c69e6bb9f68e69afe9e4212. 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/QZTB32360696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4646d170be6fd4127f7cc2438b46f6d50fdc202b448388c6eabd593d29c07ae3. 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/QZTB82227370.