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 0x90f6adf6648552394a65191eeb7c7c8fc3887de90912fecf46fdfb8c6e2bccd8. 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/5f96b017-c74f-4ff5-a42d-2c70d13b2e3a.json and https://artists.proofprofile.net/proofs/artist/5f96b017-c74f-4ff5-a42d-2c70d13b2e3a.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 0x623f561bd2eb7749b85b0e9804c9a26ad521f8a9c34373d8d52147cf9effd7ea. 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/QZFZ41910124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7621e103a7adbf64a63389a37fd8a01c77b34d2e0fb33de2388c4ba1a4c4450. 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/QZFZ41910126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd91dbce9b15b462689046cc8f236a463db001dc2036a5caaf7774372db27ab27. 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/QZFZ41910127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21dfa69a0f8c3fb1b71383bf778050f88e40f54a605f3e536f7de70a410bc24e. 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/QZFZ41910132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6490ab42339e45bbcebee604d6c0e9c28b70372b3d71d2b3ca541e2eee45ef77. 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/QZFZ41910136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd84a6b14877441895f9ea53602e73b937147fac0f160fbe86b193677dcb1dd7. 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/TCADS1806646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x889f54d5a2afe0dbbb65b9d47fa9c8769395de9fec935da3316a480bf0df28d8. 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/TCADS1806661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x564b08dd52a1963a5c40448dca2f4cee900d1f2d7529781983cfcb8bf3ea01bb. 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/TCADS1806670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2644712768b87370d5a0fc23cd745deca5028544588fee1dacf04d9fb41fdca. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/TCADS1806672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b2f75efac4ae8975350b74bc35aae7a06539a04f7c68cc21dbe87e8fd759e3. 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/TCADS1806674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcff3c6d46ccf0a2cc34989a07d3306e9df7d5d4589f9624ebd6547a9b8a2255. 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/TCADS1806682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6fd9508b3ccf64eb2b20a5b7e4fd3a76d6bce77e721eb2e9bf497fad62f3487. 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/TCADS1806685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe4a1a2c1694af2ad0a42c9070427010c142f86fb8f86e2b454a7e3682fad90. 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/QZ8CY1804003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc365fcc4e3f7f0f40e5d9e632757e5fbbaa41c45843f9d91627ac07c43a408a3. 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/QZ8CY1804005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x221582fc35664d1e0b50927ecc36dd8190550d87689625301031a5b95438366b. 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/QZ8CY1800077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f186b84062ebaaf448002275bd9a9df24ff5113d33396a528694945c03dba9a. 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/QZ9QQ2300641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38ad18dbc98f6f218e1a5fc5a0dc3dfb785b9daa7932c302dd501f14778faf21. 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/QZDQH2369839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdabb1051ac041bd154acff17aee44d67ecb4d792bf4724ec756be1cf6b118412. 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/QZTB42290640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e989bd5fbad0bb959768df66fd517388129d41406f2b09c93721a49b2a8ae1. 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/QZTAT2248008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f34b0e27295d7f06dc2cb4bf1f25c7ea4d72d56aa416e02d37d93c4e79a2a3e. 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/QZMEQ2150690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9818875a056ca025789d8b046b9c2f2bc4c5f45f427998f51f82612d8352c99d. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZK6F2154017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea86cf99a24e1a2bce40612f1209a6eaa17545263a4810dd038f396af290f3b. 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/QZK6P2143048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6542402ec21c0aebdc7899c5b1548179291a676217170804a3eed5fc3aabf1a. 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/QZHN82146741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8acac1d00d823313272d040c4997d8e3391612b5027d19540c940bb0d3600510. 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/QZFZ62085922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f002cca10b3d97c8f433ed189c0124aa23f146e093ddbc0208cb9a72b05dd1. 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/QZ8CY1804015.