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 0x37d45b6ffa3a50dc6317cc7bdf58c3ac094cac65f254999a1525dac53cef8467. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/da7f5b11-1349-4e74-9a8a-bce5730c7267.json and https://artists.proofprofile.net/proofs/artist/da7f5b11-1349-4e74-9a8a-bce5730c7267.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 0x9a44c3449f7aee0f1c26c335054390bbe7b4e4b3af0410b46c481ca0b3dba6b1. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QZFZ52068283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5bb99dbb0ebd2e4ceb175fc8b248c3f7640997b08ce3bd897d6fc85f5c74e81. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZES62014683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aea99e63dde67976fb047a0d8c83d59880231c88ed0b9a41a4609c0a95e5f0b. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZHN72084883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x653d5f4d913594d57231c8330e89a41908023bf1f9f035b68a27e81df93b18d6. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USUYG1325670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d65791ec0a259b488244ba35fee987e1cffc155ee040521a391912d2689210e. 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/QZK6K2005068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf291238827a6176c700e87f252d0d72b33c3dfbc6982019885f72e739ada254f. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZMEP2007882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6213bcae287f5eff1ebdcbbcf4ef867419593909a11735eeb38096538f730e0. 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/QZFYX2198983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x898839b2051217903f1d10ac58273cd9624232ea5886f1d9d4618a77104e17ba. 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/TCAGU2332811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x430a5ac1ba40dfa0bdd3011750f6a8bd90ce9c74fa89ea5e4e82c303a916bc83. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/TCAGM2289554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeab305d408f0e6f3c8ed112d88895a98c399e6c9817c9440deb6fe06b258e25b. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZES62105272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x223d3e6f063665ad94c3ce61727a42a11bd6353494b65ecb2ca39ed287fd9783. 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/QZES82130410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a25de71a09d6c82d33a55f7caee0b632459b2003d93a5f80b759fb02f17eebb. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZHNC2172501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5337339459270518452464d0c2f34be921cf150266e34381751fad0aa328bf89. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZMEN2136136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95f19a2f4ec17cee87699862fff52a7444dd04bf9277ef683051c1031cfd159e. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T20:38:50Z), 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/QZNMZ2113274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcad11e0e80be32defe00573278785086f5903b72d4e0ee5601e39e8ebff37d3b. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZTAU2126487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bccada3887122fccc96bb23a26f4e81e15afaffaddd2815d39d042292f53349. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZNWY2133938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe21a30192733bd49db23625972f8b307211633f6381264124b16975e74337080. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/QZDA72244464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d093c432c7ca98da1f695734ea99818729dbb64c43c10502fe3043164a7188. 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/TCAGQ2286103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0189ddc1fbd4414d348d8636f9ae05f1e1d85a8f5d1bb5d22bce927f7a9f6394. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/TCAIE2445290.