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 0x7b5f2d9c61511e9e27e567a7d12e3e6e8b7e4f1a2d4095fdb6364fb4dd7c9243. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5a3f0363-7d72-4241-a000-a95b2e41eed8.json and https://artists.proofprofile.net/proofs/artist/5a3f0363-7d72-4241-a000-a95b2e41eed8.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 0x332661fe1730d21ea2ad05236627e136674f04441802c2691b4af4a6cc2fb54f. 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/TCAEL1930729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d7890d0fe72cd2948d9dbbe819fa1d36380204120f8add3c56d1472e8ad7bc. 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/TCAEL1930737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56416b2b4e350637d6055117ba27d128accd26bfe96c99b9acf06e4e4536941a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAEL1930759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x185eaf3b23ab87a7e3c5d50d52abb20331e4a93c481bf86110f1f6d10d49bfd8. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/TCAEL1930762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217397781cccb4b3a24147f1112a4a1c47beeada52d2c170e4ff8600e48f19f9. 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/TCAEL1930764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f9d941ec8add47fdaec034d48e5085a99591e791c3a30abb1768843770acef8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAEL1930778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d26a4b7f82d883d26950c7b1d3964f22d82edb92180c4cd386a32d5d27c37c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAEL1930782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7060bde07eef622530a4c04d0168e0e2af0902180528af3b0ea7542d43d38b27. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAEL1930788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5125dd87ae9df6547a6c7f5a02e4471465f137a5c718e1448246aa8154788e21. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/FXR592401392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69bac08fb37ddcfb749de04b654327d0e281d710aa6f752442858489d8cb2d8f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/FXR592401393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf25af68f9b8a11b8f82f741762fdc758fcfd3eb793ca1388690a48033b113e. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/FXR592401394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2274113c9c06b16e7b2582eaed45c9bd66efd4148fdc1b594dad909354d4d366. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/FXR592401395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee70c1f45d293d2ea8d60b33bd21eed5a7dfff54a25acc6d95907c3e0c4eb4d. 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/QM3DF2427483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f2389d1bb599572f60821c04bda41338f322d525d04af3323fe70c31f587933. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/USHM92176932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e13d00418080ef08fd52ac46392d6e640ffb1ce4761b31614d7b1cb059ebdb. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/ARR6V2200321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f726a6d8283a0c42e263a1d46f8befd25af4a42fe0f30abc97d98b02fea3c85. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ARR6V2200323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a3be996ead6566efcc552c40d6415143f7852f80ea782f4967f01074d587cb. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/USANG2489450.