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 0xcab1df9c4e128133839ec5b9a2972151ee7d7dc5de9006a65f357c050f83c764. 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/4198b296-d55b-4a0c-bd33-40d54aaafae7.json and https://artists.proofprofile.net/proofs/artist/4198b296-d55b-4a0c-bd33-40d54aaafae7.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 0x25d34eda78215ad9061d1a6de197838d4eaa15d3a2a3791b5ad866b648c6e036. 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/QZHN32235995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd99b342e2fef0e0c1626cbb69bec704aeaafe4b5760cc5bfb3e358177830245. 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/QZTAX2240246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cfeb1fa5e197cdf2ed7301281178212fb7ce1a92ab8ffeaba0beefeb6e42179. 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/QZES72318173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97b073a0fffbd96ce83322eeab6ce2ddb77242cd2b8c3bb0a4f2997d1f6e772. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QZNWX2315061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x342e45f90a2f9fad332eb08ecbd31ab1ccc74d3495757afd6b3132fb0a4639bd. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZWFE2363725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23502a45532faf20d5bca669d963f25ce4b582fbba9702ae2e4921feafad9186. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZWFE2363726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe4a2389b56b3ecb4ebe5d50989e57e28311291b19782b79f4c4cc279213330. 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/QZES72492054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99a8277c7650373685b32b8fa124f876f0d6c3d2e0b1c7256c5ab229431d5110. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZHN72456936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3f638138ef700f38a975989dc304c1567cdc5e71d32fe02a03449aefdb2be41. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZK6L2407542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a5b0640e338879a36b9331a316847282449cafb650d277b3312606469fd1cc4. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZMER2482108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d785a52f272d8792ffc74e7838944e6cc9772ccb751b3218fdbf6bc561b7a9. 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/QZTB32443735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d3874a07535f5cb68b99c09848796ef879460323bcd0231de4c0d10687d1383. 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/QZWFG2435402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27319e9b7815dc572ae39a7a689952dd44e5ae07779e188dfda6e5f8597fa58d. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZWFV2466794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123226d60bada37e9c7497a51b8be7c30c624ada0579cdb198afb66185ae8f8c. 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/QZFYZ2557719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8469bc3816fa32037c76048b80dbf74143a20787cf2011a961dfcdcff7d7eff0. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZK6H2580836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee22a85ff88145ba06e1f880b0d9778eac7d9cd6688fbb7e8141a77b60be26b2. 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/QZZ7V2566853.