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 0x05e934ea41e160292a7d685c7d87d6fc10dd981de74ccd670b07f3c709517032. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ece0af65-f1eb-462e-ab1d-429114d24993.json and https://artists.proofprofile.net/proofs/artist/ece0af65-f1eb-462e-ab1d-429114d24993.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 0x50f5e9712055ba70b0fc49a88a17d622626dfe92928cb8c3ea3b4764fca45bfb. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZHN32123388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73300e155ea30a7b44f25eff2aab58d3568ce0e89c022da45281908afae5a757. 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/QZTAS2119642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0928569aa14433d6fafb2d6c0e703461d4182a4d21cbd9e608fabc4fc1f9ad40. 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/QZ5FN2489686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57d6a28692bfcbee487ffc90a761e0f02cd368e4f0f1fac8f297e8dc24f052fe. 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/QZ5FN2489757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0735c5a6f5a8c14ce02d3a7d4b6929d936251dfe434034ad4a82cfbce7f46f3. 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/QZ5FN2490039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x908a830d4c31442b45f202ce0e2c9ea2b1a754c5c8aac0a7da1f0e713a416e26. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USLZJ2489209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8929f9bb38a076a97b2368f28324298b42c83692c3b61b69f100cb078cf630e4. 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/USLZJ2489210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4a286741b9ca53a9dc3c3086165b87df47ca4dfca0499d2a8524fc33ab0998. 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/QZZEB2401972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96a5913feaff4e49dca934af269cf9b51e6a2c2331b1cf8b06ff1444693ab587. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T08:37:45Z), 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/QZZEB2402009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4a286741b9ca53a9dc3c3086165b87df47ca4dfca0499d2a8524fc33ab0998. 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/QZZEB2401972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0de368e6dec9175d76b6f216578fd86cdd75bde0a7e19802d5b257046d3a35. 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/QZZEB2401993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7bdaaca12cd5df445391226b009a6b25fd6dc4961870a11d70f53da9d424ae. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZZEB2401983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d446a74fe4a77fbb5861810135e699ff87299851ff2092e5e5b6c7a48f9193. 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/QZZEB2402022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x768992af42b960a2ac8fcd5455aade43593c0f2f1c004ace0e1cf3f8fdf2cdc8. 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/QZZEB2402023.