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 0x6163c20d442dc7b780155712e13263b0205b08ff2f69940cb2ef0715d5780f7e. 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/836d733e-5751-4ce0-9923-e15d4749700a.json and https://artists.proofprofile.net/proofs/artist/836d733e-5751-4ce0-9923-e15d4749700a.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 0x29db6ef92de02e7adc5498723a935af057b7f59899409e5f131e35cb18e9bf18. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/PLR862300374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb851537295607f264945bc635c830f7ee837475c9a8d31b9f30e3e37d19c8a51. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/PLR862400466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95f3d12955505036a8388442ff9cdb60b8bab47593b4e239ea515516325d814e. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/PLB172000190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95f3d12955505036a8388442ff9cdb60b8bab47593b4e239ea515516325d814e. 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/PLB172000190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a24d774f523aa804e46229f2de4293aad47d3c347d409f993a6b1c784ad07a5. 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/PLM402307004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a24d774f523aa804e46229f2de4293aad47d3c347d409f993a6b1c784ad07a5. 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/PLM402307004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c29cf13fcb420ad962c4a64fcd8772d2a9198a59b158dd4454500b1fecea1a. 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/PLS282100120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e34673e741d2369059906f7c672694cf75bc9750e2393147ea82d047cc17ed. 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/PLS282000199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x166c398e100a127e9e23d1d170417a3a5c02ad31f466e2afd6621b52f2562ab9. 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/PLS281900476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8718c787c03033b527ac8e4b1db0aae535e53182bbb66b56f78cf16881f6bdcc. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/PLS282100129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3d888f9207e8790464a87aa97891a3aed9982c9893271cc3444700057cb77ad. 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/PLS282100132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf371f878204f1ac28e742c2f9f6d132eb39ba7200a4fd1438936d0a9dd1ae981. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/PLS282100137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x680ac97e703f34b86b1810e7b50e23527fccb028369b207506b38fca5c7329ef. 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/PLS282000076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc3d99147d56666d991c07f1a5d6158a640be0a2841c65987775918118f5eb21. 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/PLS282000080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3da401c7b8f97a84721e9be6df18a18c3b1e401b315ed25f5f3ecff5f5bc19d. 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/PLS282000082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c29cf13fcb420ad962c4a64fcd8772d2a9198a59b158dd4454500b1fecea1a. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/PLS282100120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e34673e741d2369059906f7c672694cf75bc9750e2393147ea82d047cc17ed. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/PLS282000199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9cf5b8b4b7e786bea1ed81cbb5dff0157b77f91b476c2258a8d0714a0a94409. 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/PLS281900547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe961e00e04d2d374eb0ae72177b00790e788235d8b00d027b1d740ef038f41a7. 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/PLV402201809.