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 0x208ccf8eeea73820e76227dc4f9b4582ab6fa7873e9ae1ed9b7278917d183da3. 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/30ec4fb4-d652-41ba-b633-e6efd1a8bcbd.json and https://artists.proofprofile.net/proofs/artist/30ec4fb4-d652-41ba-b633-e6efd1a8bcbd.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 0xfd46d99feeb1db259b5eeea1f1636ac7192995d39a328b33e1c0e15cbf940650. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/GX3Q92443892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36fa59304bd44897c83fb090d83109b47849f19385667d6abbeacf72c0ac50bd. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/TCAGL2236390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb1c1940d49ffa125e7f405655c5d612c2281b4d3eee6a4266872630759414a3. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/GX3Q92443895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfafcea80c84b002626af35b197759ceba647532e4728dfa59a8d803cdb8bebf7. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/GX3Q92443896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa011681b609f8c78c2596ea984886386ec0aafae9c48e875b5d977302563a6d4. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZHN72205555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71b7248d515e242c6c5cadfb4a4d97e70dd7c54c9c3a58bc8cbd20b297a68a5d. 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/UKXN22403166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x892c76fa1e6e9a0d4d1afe2e40576703dbbf3e2633480112360c29d105f61b4e. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/UKXN22403168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63129145bb2fb07b56a0c9ed0ae1e7b00718cf1762bd23f8db533c5b3eaaae8. 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/UKXN22403170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa67cbbca93904d6d1923f0c1b318c5fb009913dd71a252c58064c58bb1c0c128. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/GBMA22369522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a4f58c91c8657d64a48cb5e8c9bb30a3da720e078e44e12d3fc8f3d2ff3a10. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/GBMA22369525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48014422bc764dbc5e73ba70dbe060f968a70c8a0eb40ccb52db971e4b0ee656. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZTB52383043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e0a9acf5dee5c951269444fd9f505bbdaa50b5c4e0b6ba365f00996a9f1c25. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZTB52383035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81437d112f0f7cdd19b872c9bced5e33d3ff0c0f3b0a186aa0dfdbbfd12a2caf. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTB52383036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78b9ea85a0f4005997d8b3588de96f905f475761622b520731245cc286f75865. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTB52383034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b2cd9e6bd6ba6889d7761d406b1639527ce5b4a3a38ccde4e95a1c5b9d6757d. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZTB52383037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37387f2785af32b3f9f0b1406bc552aa42cea96969957efdc5dd956e522554d5. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/QZTB52383038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad4f510c5ef25e438dc27dca6eb85b18ea7c09b5a0ce12a80f65a8acae5fd69a. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZTB52383041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e0a0e5cc65841496d75fcd3d2fee0faf693f48395289494589f830561737d61. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZTB52383042.