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 0x8d286179462c21eacdaef2b8cf3e9ee440fa8df4c0e12da6403ef13b76551c0b. 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/b3349611-cb2e-42fc-b8d1-a567aaa3d032.json and https://artists.proofprofile.net/proofs/artist/b3349611-cb2e-42fc-b8d1-a567aaa3d032.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 0x2c322c44ec1a062b61456f4274868ce10522c62a840e215756ba4b9a2a6ef2d0. 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/QZWFL2350371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad740ac80b8c1fd0997fdef7bdfd41868247659f1fd0491f4740b4e3eb3c3255. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZWFL2350373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5365c105ad0ed37c197eb0866ae4e93c0e71314fb83ea1d3d2ce64fd125cb09c. 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/QZWFL2350374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ba452ee8c2edfa76f8873a269db884ed721cba7016d27c69ebfedb44e661922. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZES72482614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66f189255445b8cdc49e584fc958401b064ca29d39364b6efe36399e5f452719. 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/QZHN62411588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b9af0688cafc5a5a7889195d6768df88ccd28552d6cba34399adbbfb62e923. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZHN82430410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb565325606349ca6bff7dd394a3a4bf5b3afab384c15cea23282f0390ed289cd. 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/QZHN92403597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd79ba7d83b4f4e92025e42f74b059ad96b347f81f0bdd8ba8cb0532687a452. 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/QZHNA2471989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab19bf06fd5bf892f2db5fab9b6b84e522028156f3a01d16d3855e98bc078cfe. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZHNC2473979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe38d5fd72844de3050b2fe5de5aea0b1132a2e3255db2548075a2fd31aaa9e81. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZK6J2459878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff41c99b7e0379a5d8e82c00d2ea0cb35366dfd602f8e28417d94f80f77c7c03. 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/QZMEM2400973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af97094a65426b1e7fc6823ee6c8a876df5eca38205a6d2980183b5041413ed. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZTAY2415372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d0e5638a8574edc61eefc63007850af0084d4ee16f842dadf6ed5eab445a714. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/AEA2L2506375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4866436b73dcb3f5d8ee8d7805ae399762348f0e370c2a498b3ddb98f6aa1f0. 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/QZGLS2446788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eb08508cc614aa81008d57a952355df770f749a97dd6c021180f53052d993f7. 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/QZWFN2326318.