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 0x55947b844f03625f4a3e6a4fe96da557372f58e4a2403b757abd16d2d2746ad6. 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/77498454-cf3a-4b32-8556-01dd33653b70.json and https://artists.proofprofile.net/proofs/artist/77498454-cf3a-4b32-8556-01dd33653b70.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 0xbac8da21a40694dfa091365958465e1edbdfa235cb282371283ee50e3d8f1fdc. 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/BCOZ62100046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb286360cfcbd6d48c71f3a8b7633df664e6fc3fa6f3e6e6f584d829bcf5c1e. 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/US3DF2416218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x172e2ad36478a4a92ff25b395ace2f9fb2d05bbbd1a618231c4e79d5125362e2. 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/QZMZ92148940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ce5fa44f4cff368f479d1db4d5974bf9f2cfd16f19eaada98c17ee498f6630. 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/BCX8H2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dd9c42ead35b36897821368da38ad931152ffa9301ece38b1aff63523359f38. 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/BCX8H2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02d207c044ff2db6862fe6a6872184f090b9f139a4e9997e9c784fa1984472eb. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BCX8H2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ec7119d9c4f584e40bacc4eaf4e4b626bcb78ad7c0e4e988842d0393ee7c011. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/BCX8H2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf133bc4bfac48401e96208b7ddef9395119282be3f4c1781b083f159b0d17096. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BCX8H2200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1880f8432a74da230f1d62071aab647e131d3f5dd2e3fb5a70b4df53c319532. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZNJW2101534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x683693a0935e5381edbf7705aaf277eb9cddb0a42b21df2556340c44d870a1a5. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZNJW2101536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2619be6928ba72c2baea11e42ccb8aba4af19870bc94f45b1f17d4c4ca268869. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/QZNJW2101537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb286360cfcbd6d48c71f3a8b7633df664e6fc3fa6f3e6e6f584d829bcf5c1e. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/US3DF2416218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bbb7a05607db34b3f790fff3064ad6b62e61cc438a61878a1cd4933ff838162. 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/US3DF2418243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5905a5adbf914768e256f895ecdbb31af04ae99790553f5b9a9d5aa6db4d6c94. 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/QMANG2452787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39fdebc35deb14b748093e21e8447ff6161571d85bd272fdd8249364778f5209. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BCOZ62400005.