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 0xff72034a7f1f6468494d916e427f11316991a85894ce723d7ce8edb00cb3f214. 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/7ab0d7ff-78f7-4970-a3aa-9ac07b88fc93.json and https://artists.proofprofile.net/proofs/artist/7ab0d7ff-78f7-4970-a3aa-9ac07b88fc93.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 0xe08d630c1782f6ae8e5816c728ae7a95ca58e4e71e88fe86afe4601ff982e3b8. 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/DEBL61188868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e8f855993496d139530c05f71f8ee18ffd79caca3574380cf54d2b5d1389115. 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/DEBL61188880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ac007d1e700235d60a6de1ac94be8acfa33a6e8406db61e223fc022832a677. 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/DEBL61188779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc48acc41a63d4c0ad5f4ca6cbbdb0450085785d0f4b6b8a0b0fabd9fe17af9b9. 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/DEBL61188782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32fe94133d7d419aac8b86ca85ea3180f5459aa8f687469d8cb03c341e29a23b. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/DES871415713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ec087050ee85dce6152c8d683ddeacf0d93006be1d277c2ec38eff67a7aea5. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/DES871717601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b6aa0b529a55af4cca2f648e75f7f7aa9b05908feb8d886a3f81f7d92ca07f3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/DEGL81804502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x966facd987941fb8bce88bc876c73ee329c9d44a80cc4d0f9c5e4135a8a683c0. 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/DEGL81804701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ed39b6abd6bec7e6e651f3b87eea73df46336faff778d79103a57a81c451ff. 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/DEGL81804702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33a1fe40d9e2116183b6714882dbb4fc2937c053647092f68b9f671c3b4d3893. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/DEGL81804703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c81da18b02d023f9c64a7e9ded543d8b7cd24a8e51d9670205d20a47d91f260. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/DEGL81804709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dab75533c57f5cd1400f9089210e2ab03623d50b46910a27ea0d28ebedb30da. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T23:22:12Z), 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/DEDE32525202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf72f8be3f088efb4e959e28954d4455100dc78f22aeca51b0cbef1927dd44a. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T23:21:52Z), 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/DEDE32525203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f39220c02f38bb019262a5f659a12b46c175c59e060137ddbfcb12d46acfbcd. 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/DEDE32525201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf72f8be3f088efb4e959e28954d4455100dc78f22aeca51b0cbef1927dd44a. 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/DEDE32525203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd8690443c65f7fd175abcaeace171d18496d000bdb4041fcd8a70551b7c52b0. 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/DEDE32525204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x391b753526eaa14ebb7459e71ee36e12e4e34f047e36c002c4fb018c3e3e2a8a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T22:09:07Z), 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/DEDE32525206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5e6ccb633a40af46b83678f90bc63d907dbbd276b66b8a5c81aff18b8eb6fe7. 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/DEDE32525207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e1508e065663d1d6ee9c0315493dce65dfe85d70162d8d518b5107cdafd42c9. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/DEDE32525208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x165ab7ad36a10580764e989d32f8c5e1089b766ad6f3dc4f802b573c23984561. 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/DEDE32525209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58c66340e436ab4d08173fa6b97c66a9c05d32a3bd12ec4cba9f7aeed8973ae8. 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/DEDE32525210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02ea564881c15d8543d22cc3adac3866ddfa5af3f422ba307fc2d71d7ce31c1d. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/DEDE32525211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f3db0d35ab0cb0c7bf43fcee0cc4dd8c7e1a5d2fea682504d021d3e9f544596. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/DEDE32525212.