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 0x4291c6f186db22148a5b5ceeee01db3f2cb4558105dfc48774873b9bcb599b23. 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/b96f6159-bf2a-4c2e-922f-11fe9bb7c5a1.json and https://artists.proofprofile.net/proofs/artist/b96f6159-bf2a-4c2e-922f-11fe9bb7c5a1.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 0x47137987091317f4751fb276173a31a6e513898a953a66531dbaacb7a5b604af. 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/QZHNB1924170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaccfe68f74a3eed4ed35b1a18de5b79a8d3bced92ae2a55d7b5313fb0fa858a2. 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/QZFZ21906179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b8df4443878bf04cc1548b660f9d06f3c7d6abe608d818484929ea523eb3658. 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/QM4DW1892995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7f461850048419485adeed07026c802902ca4c09971e199427af8def8cc170f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:53:29Z), 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/QZDA82026530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb598358180346e2d63c2e97b2b500bcb22e1fd96537ba4f9a7fc2fc986b18422. 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/QZDA61889915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda280831d5fccf7d4f9d2a438923125f72c7da79b92548c35dcc1fd900fc70f9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:54:19Z), 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/QZNWS2341761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a88865b4a5fe40383e01f58031fc69c44c69627f7937e1e597eeb5ed8d60ca1. 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/QZTBA2275751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x589e4d57f2836b0588f584988d8d8a474d4ff44dddf0f3803b84f0aee96d24e5. 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/QZDA72356102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb7341b9aac0163cac1538cd6fe1e8fa491cd83eae55f997f06ae93fc730b5c. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZK6H2311974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47137987091317f4751fb276173a31a6e513898a953a66531dbaacb7a5b604af. 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/QZHNB1924170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b8df4443878bf04cc1548b660f9d06f3c7d6abe608d818484929ea523eb3658. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QM4DW1892995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2839b1989240534dcb13c6dd008bf237c4a67c95964fd71b37f8ced880b61004. 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/QZES62138264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed7f71fcb4d0ce6efc04b7fb7035269990a84897c98660943569bd06072e057. 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/QZNWX2129631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90bcb55e26aea0998d64617fa922b9f5b8aa5bbb91584a458ff9f2f644671a4a. 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/USHM92161368.