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 0xc43a69536fb4ebf775d5b02a90aef16838d3a2512c99a24d749a3109a708686e. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/381bd065-055d-4878-a6c1-88b458a2b061.json and https://artists.proofprofile.net/proofs/artist/381bd065-055d-4878-a6c1-88b458a2b061.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 0xf91a9a8de18181e390f3a0ff991dcc20701a21b43fe68f188c8964a64e976823. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/TCABB1121743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd48b675346cc647368f993d7a8643ee0edc3fe112ffa1476c807da89fd2a5e43. 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/TCABB1121951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbacb6956bdaedf6f6bd7650ac1a9fd321aa6e7a81f9532561dac54df62fe3b53. 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/TCABB1127556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa1c725b90012978ef2db33f0886730f84d2cd49186f59b7b7b2952182ae1da. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/TCACB1449781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c13f707e3762b525973fb3251da54296d2ef60a43a3f42419c7ab7f59b253d. 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/TCACT1669163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde85b6bdee6d6d8c4c847bf13c111499970fb4b7d0a571a047ff90cf41853cc5. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/TCACT1669186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x883f823d50431de12d1d86f18977af993274a234064e3ccf873e15cb54e16fc5. 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/TCADC1705555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f659d73327a695f1b98170dc10de54b380c12193749096c521da495404706a4. 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/TCADK1740651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd37ccf7f871e44e35194431bbe9372d9fdf47d2c2013f28d92edd99508ab354. 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/MXD781802674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cdca7d8c34508741095dde3d8f2c048d18cc9446344d523c8382c5a70287f59. 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/TCAHM2312269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bd64c72e31cdbf56beb850c1fe14db2f6e92c84af99082adc54b5ce3ad6588d. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/TCAHO2320363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04edb8a0ef16584872e73b364b77631ba5f103630dab67b9ffaa0173566bbb5. 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/TCAHU2433600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1fca87dba1ac675cd71c26018e04ba220aecfbba2638332064ecc1d7fa7e2ff. 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/TCAHX2429311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09ffdee4984cbe16e6299b622ea91271b0a37b95d7681f70d3c5271482d4a60d. 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/TCAIE2433531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb675fa8276594b731a28fdac0e6335c1979df39ea12c8ccc75521bd13551c99c. 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/TCAIE2433541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e92b71c9b4cb129abfd7d9dd464503ac8833cf8939388be882e733bb226685. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/TCAIF2433556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86da1d6390e0e107f8a5afb7b9920eac637149d536f8b9954cb5a5a16f68358e. 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/TCAIE2433565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266f4776c2891edeef4f53d35fd86055f3b506059ce1047682343c7c95bd0b89. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/TCAIE2433621.