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 0xf7b28255cdea1d2fc43627b394f1b3dc90383750fa7becbb803980642ea1a1bc. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3bd45ed-3dbf-4051-8c3c-e7f99c28ce3b.json and https://artists.proofprofile.net/proofs/artist/d3bd45ed-3dbf-4051-8c3c-e7f99c28ce3b.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 0x7f75c86ad19f2e7b38cb6d37e711116c1a8a49417b238736ad16eb4d1bf75338. 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/DELJ82075105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb69cf132a1930223facfb12f977b272cac720ea30994a9a968762bcb322baa24. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/DELJ82084512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd687949d6f52e3dafbfdc3e30ac4ca19b67c5ca82c0474adf05c492dac85a325. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCAES2012849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17315e4aa5e71cc36f5135d280c55fb39cdfd1ed4d22e3cfb2ccd59e72711415. 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/DELJ82011255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33a19f81e7cdd18240651ae103ba9bd29ec4933e79a68da44c071dbf625e89a2. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/DELJ82011256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4fa05b5ac31f602e2520f0c8b56f75325d6696f2125a975497b199426e046ea. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/DELJ82011257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x518db530e9a278fa3361bec4b0c04e58beeca6627d37577a75cb62974ed28acc. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/DELJ82011263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x515519f49a5ca9ef9892584c4a8d5eecaacb3999f44a4b08da8fc090a1d50455. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/TCAFA2023026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11bff218160a4c00901c01b44f7e46acdd8e47d71f95c8ed3933e572e0736021. 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/TCAES2041702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5629d3c8361f30ca2e6648d3c77b12e5f30fb29d739cd812ad2d3445eb7765a. 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/DEZC62102636.