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 0xa5476e9ea7d3a7d567be713f932d1bf58d2add9de7a9570cfe6542c9516121a4. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/de728f48-0156-45b3-a4e9-b113eef4e981.json and https://artists.proofprofile.net/proofs/artist/de728f48-0156-45b3-a4e9-b113eef4e981.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 0xd19f0dd732eaaa815ab773dea9b8ed477c09d2834b57541d3edb558247a7a839. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZNWV2371173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe27b5903c0de1c3ba62e370feb5d9a3e7e45f3cda633e5c4d30c3d0295382d. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/QZNWV2371174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8656b786492a534d280898309b2d3c496b8b976a8f079bc559cddedf45c6eae. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNWV2371175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6400393b5560f304959b6e4a22341d65c642c1a5be0533d7eec96c39fa133a57. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZNWV2371176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e5d14dda93b5b6d96c9f05878aedbcf92ec9d9bf8b1711510177a69f6fc83e. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QT3EZ2450889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x664c38476572d077b788e685e5e7481ac7d4a96f885ce4348ac4ee479045e0a4. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QT3EZ2450890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ed961fdf57c917558317c0622a65f0c796a88ee28aeeecb84672abede0d7686. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QT3EZ2450891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b6f3644bcb6b50ab680ba34d0353dd74250082e1b0c8e12b9d78151932b920. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QT3EZ2450892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02804ab75cf31cfe241f6d9572169dac96665d7b3d29b84bc502d47e21437222. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QT3EZ2450893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6628cb46a7ace026e4c811343c19745762b0288d6dd1564ca7f23bf6c4a8cc9d. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QT3EZ2450894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11d24647f06c9774aa9691b94c447359452a91e77a049d55af7ddc29796eefda. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T00:35:28Z), 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/QT3EZ2450895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bc931401ad5ae89a745db557691048ba3c14677ac68018b122842637615fc56. 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/QT3EZ2450897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c20e662cc868c34ee2f92ed535ac5c11bcb89e1dd9eb234b778c4ec6f12758b. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/QT3EZ2450898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c9ca679fdb8958e7c8a6348bd0eb80be78910f6357d45292fdac6db47999e1. 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/QZHN92537837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef3d62fcece71b4cc365bf9ba7979b2498e45858f4474db80f304c5aa1ccbab2. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QZHN92537838.