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 0x510467c848597acbf4b8431b6a4083bdff55da2bdef606b89e5f5ebdd2a8f98e. 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/f486f59f-7120-4cac-bbfe-b621e6536604.json and https://artists.proofprofile.net/proofs/artist/f486f59f-7120-4cac-bbfe-b621e6536604.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 0x26ee9cddae37429d2c704ab8e3bbeaed15482ea46bf8c53b6c78433909d28413. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZ93L1963859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d62a5e93b3df0b5bde777c0198c93bb170e569a2123132aef8ad2184287ca96. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZ93L1964351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9037cfaaf8530c21467e378ed69f1aa1c46f0ebff6187c53b04b8d6ce70c39f5. 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/QZ93L1967752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96d91b0b155830b2065811ca2906d62eb52c0df94712458ecbd1a0dc9535880. 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/QZ93L1967753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d916dfc44e8b621683d01e129cb75a68365ec12cc1cc085fb38eb1318615186. 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/QZ93L1967754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a5ca2de521c6cd9638328e841893c52927e5205b7ef8126fd089445e134408. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZ93L2132032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ef52e0303718cdd137434391c9142f653e7999bd38e92aaa9b4552115bd090. 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/USDA12204258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20eac95176d90f9136fc5b140706a9d9c2d229442a794b396b0a9b3b42255e71. 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/QZTRX2272483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe91728096985d748be405b8f4de754290cbd3a9997d35522f2cd9ab2b9320e54. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZ5FN2359012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfa4b549dec9e41001827833b33db6010a4f54c1f9fe8f70cc7c1f752e065e73. 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/QZWV32466903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfa4b549dec9e41001827833b33db6010a4f54c1f9fe8f70cc7c1f752e065e73. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZWV32466903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad4740eb0e646afbbce4416b508bf6864e37297aa48481213fa85729feaf0293. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZ5FN2586344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c92c64c15dc203f5cbc4d1188c3a9a4148bf7f9af11a8d43c08c313084a43c. 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/QMDA62540832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aec11dbb94f984e84ab1d92fe8b99b923d4eed3d293d73972fee8964e9a3a7c. 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/QMBZ92548643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x722c42e5e330d0c18e3e189063c5dc3e2a94e1b9820d2d3b6d263b1835f6d70a. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QMDA62578157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aec11dbb94f984e84ab1d92fe8b99b923d4eed3d293d73972fee8964e9a3a7c. 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/QMBZ92548643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c92c64c15dc203f5cbc4d1188c3a9a4148bf7f9af11a8d43c08c313084a43c. 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/QMDA62540832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48eaa504b850adf32dba9c5d2f0436db2ea6abef90197600053365ff5d894bfc. 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/QMDA62578190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad4740eb0e646afbbce4416b508bf6864e37297aa48481213fa85729feaf0293. 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/QZ5FN2586344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a4f81c3a81dab1559603df8c01da7a5de7e268a68a0c8683efcadfd5cf82c9a. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QMDA62578255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea5a0a6d7fe46e50e5e9fd04a6480a31afbfa1ec7af4ee35355ca7b6802a35f5. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QMFME2578044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x387c717ce449910d78691aaf7375d7f07a539edb31aaa331fc7f880da071b31f. 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/TCAHH2367486.