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 0xbd2ddbbc44e5da2ec511964d45f9482c3bd71de85c094471c4ed53769bc813b0. 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/bb497d87-c20a-4916-ae76-e81ce674d7d4.json and https://artists.proofprofile.net/proofs/artist/bb497d87-c20a-4916-ae76-e81ce674d7d4.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 0xe7762e83febacac184066ef2ee168b5cf53ebce8a52092e158e4a1624dbefa96. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZHHE1900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e7af6cf31db2aa9dbec4d92571e756ba854845a2697a8292d84d69ed0281790. 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/QZHHE1900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d52f1140d6712fe953cf1f4d211b1ad815fc20d42311abab0039249fb82efb4. 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/QZHHE2000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35ab17c66bda29f68b0bd1db8b568b7ac6add5ab789f4c9f293532f93c34901d. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/QZHHE2100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee49fe1cae4a74a9c03a6faaae40e29a83ad32d1936d4b35d4af6bfce16b284a. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZHHE2100014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2541ad0669d8be3efaa57ddaf9b6e74abbe1c5a720f06c5f29e47ec1e249f575. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZHHE2100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4f15a0a12fa5e5b19fe7859f40924f201f1e4419dd808437a456746910f5997. 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/QZHHE2100016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf49cf48d25ec37a4e46e9fc29bcdbf712d3c75c4335499199c73ecdcfbfe01c3. 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/QZHHE2100017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67dbc8b4c3435c6940267308ff7f325ce1cad8f168934b660f0a9da6ab57a8a2. 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/QZHHE2100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7f4bc067b7d1ee1d4010ad4b30a315c4bd36dbb33423cc12b35879a0e93d2b. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZHHE2100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0c76730d6b3c0a1500b393780fc778b286b6d2a135d2b7e2d68de1e656e73b. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/QZHHE2100020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x613c621368ead4164683c6d52562346b3d4008b05ee0dd94231db7384d1e8791. 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/QZHHE2100021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf82e809db16c33f41cde65e2a71145baec3ea3326cd2d156d26c11317d570976. 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/QZHHE2100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x328698cd57355bcc5b5c83a59c8682ab231f28f3e4a0fc3808fc1866b7c02691. 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/QZHHE2100024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x541f5d98226987ad3d709d3c39d736034b946c5e18a8242213d99e991ef12d26. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCJPM2055567.