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 0x78a31912f6ff5cec203c059793911aa6f1770402b77b74741e2df94041452185. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/622d53dc-0075-40ba-84d0-f37139ee75eb.json and https://artists.proofprofile.net/proofs/artist/622d53dc-0075-40ba-84d0-f37139ee75eb.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 0x7df6c687b4471fe0aa291badfb0dc83413bec6b290bbbab8f6f45fc2552f509b. 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/BKNBN2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe061254ced02ac9e8c05c2091324e9cc9085d7bb896e6a6d5715144e49457e. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/BKNBN2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03eb0ff0f0cb1b1c0385edcecbe1011cbda7f0199a03f605192a26602b350540. 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/BKNBN2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76cd5208e31f35f7ee6b9dd49dd76ebb000f5443b35c23dc3c95f3e6ed532ef9. 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/BKNBN2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95afa0949f31c42ca56829e1e98b53b4a5d327bbdb93830549e1d39a8eb5ccfb. 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/BKNBN2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1351fd34351d89a3c8e962e5cf4a09a95d5a24192a514cdceb1700d036c28ad0. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/BKNBN2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5049a08b81755d6c3555e47c812c57cbff045d65552db77997bcfe77bf5de17c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BKNBN2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x981a677f9f9f65ee82b88e647d293026c890ad9ef5e7e2ab2b10acc333f9ecd1. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/BKNBN2300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a46605c23aaa79fb981f5beef30f5d4e73dba5aa0606fe31afd668d7eb15cb5. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BKNBN2300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3dd20644846c7a3c22ab1a5f513a96283ad06ec2466b4c05517858d039b7d80. 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/BKNBN2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x750ec301e984cd1e4731db4bb98516df290e9a5a505b5b42f0c2036139f27ac4. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/BX5M01900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79f6b4a4c128b3b7b27bbcdb9ddc26066869b401a3446a16f57d920e401e3300. 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/BXV5P1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x915680b8536097ea3242c1346626897b3ff4eeac879682d694a0de489974690b. 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/BKNBN2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0be1b0ad903c5f76bae72b66c56738de0b72794fe0444780d3da97155bc3c4c. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/BKNBN2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ef8e274a848fcf332e29a9cb0b4d22d4c3e75f48e78abe5c245740401d2ded. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/BXV5P2200017.