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 0x7bc852dac91ab42dba81972cfcc1706892662f8a35b7473c9f4cba41dc6a1696. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a08d562f-23ee-4649-b580-7551728156bf.json and https://artists.proofprofile.net/proofs/artist/a08d562f-23ee-4649-b580-7551728156bf.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 0xe102bae8b1f44c43fa38fb2d13dbf5360290b8eb0100a6826cc9abd471c20e3f. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/US3DF2451746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a85feefc729b023983c87d4ef8cdd6ad250b49e62d04d514c8abc3dabf8906. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZPEW2440483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70777c698589e91a14ac58c2172dc716712b43b44b8dff75ae51b13cfb46273d. 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/QZPEW2440485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe070cc6e425a3dd615e11c06b8bba5f2624804f8b91dd87968d794f9bf25e29b. 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/TLVEM2468244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bd497ca5ec43a3fa8be4278c7a99dbaff9f3737e065cecd2f0547e7008edfb8. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USANG2455355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f3dd2c88f041568bb078a201223441f0fc89d84f794280936a8cd2fc95eeac. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USANG2472457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed8b2e2757bb3a8795e57ada68f7b7062942f3ab9788b3906ae764b19dbecc9a. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZVEM1813181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9dc99aec1a2294d12adb4228daa4672eff9157e667cc4641aa491d276538743. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/UKZGC2411421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fd723a925b2e9cdec5a6f04bc9c7034a643ad08606aa5710249808f22a8f2d4. 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/FR2X42544239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14629d97742984e4c6d93aef014c0954627024b646227a12cea1281ef6bb7876. 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/US3DF2507133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151ecd79e276f1530a5ec8405b5060653e5bd0d5a0bd7adadc6ef5c89c2c04f4. 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/US3DF2574484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d5620c9953af0461bb6f96765b5c2b13161136786cef3b2198283d3d98232c1. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/US3DF2555340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x716a0699d5509e7263510de7eb9210103daf1f24aa6b59f524a1cdda3511e83e. 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/US3DF2493536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb838b59d9ccb6b5ded7891962b7152352d2aabf68b058778b7fe31a79037ec11. 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/QMANG2237318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8ba25d94e943131bf2cd445ab76e9acc31bc920026d273b38a7dd01a2d4b2d. 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/US3DF2485523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa40fe17ce9a9f046d048be81f8164e343d3d1adf6e58fec507bf14b773a9d934. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/US3DF2427201.