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 0xfcf30e9427070e417ed706929e2d6a3a1921354bd0117df36a179b6f1ffbc66f. 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/49cad58d-9a8b-4953-ac48-90f4f5fca309.json and https://artists.proofprofile.net/proofs/artist/49cad58d-9a8b-4953-ac48-90f4f5fca309.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 0x2b0e02d42ea72e7e3892868f1d1f4544f8a24f407bec7b40666abd80f7741980. 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/TWA539201704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef63eb2b2ae643456fd52e5d04668bc74bca91b2fedc55d04c386f0f61ba66bf. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TWA539116501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5466afb38797f0b7e799aed722b7a01815844b460941403a9c0e053c62fbc0dc. 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/TWA539118206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cfe687ae79bc70e16196903c669a38294301a7a689b942beaa291cf3e494edb. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TWA539223901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeab46bb9ac0f5c14ffc0d565c7cda0b242b9bc8d1f846bcb6eda0f4a3849b61f. 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/TWA539012301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a73784e95477216121a5b79dc72a8a22d4b1a6b762bc6a21459fe87574af2c6. 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/TWA539118201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef63eb2b2ae643456fd52e5d04668bc74bca91b2fedc55d04c386f0f61ba66bf. 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/TWA539116501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e34917caf41aa3991ff7592f09e0523b91c5b3ceeba99b94c26b9cddb49cb0. 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/TWA539012306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeab46bb9ac0f5c14ffc0d565c7cda0b242b9bc8d1f846bcb6eda0f4a3849b61f. 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/TWA539012301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685cda83263f6d4d11de78d876ed5479d4e319312d8df528ab4e5acdab8235c6. 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/TWA539399309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbf8e3573e4476f0e8710302f69cfa358c5a1a0b817327e21b85c9a668d40059. 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/TWA539223906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x638623ad66723f69c8641fcf254cb416b490498f77d75c89accbe3f52fa388f8. 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/TWA539900108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c9311c610ae640a63c1cd6c17ddc360cee57872cfc9c6541362d4baf9d34da1. 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/TWA539462902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3957dd3ea58daf6e355bd6fddc848c79a24b2b5218e6ec9fb78a52a820638c63. 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/TWA539462903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35280226487207dd8f89712711bad5cb16e99f90f2c0b05dd1fd203b7e18855e. 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/TWA539462904.