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 0x1c24b87c1fe8fca16a4834f0cb4d9b728a85fc580d97567a4c5d234c1602d714. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d9052356-2d58-4852-826e-e876aa7c457e.json and https://artists.proofprofile.net/proofs/artist/d9052356-2d58-4852-826e-e876aa7c457e.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 0x39a4d7232d88002ee47dcbf354a454f33fa0c43f3fa2f9eb8364e8a43d70aa37. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZHZ32174383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeac9c1c7fbd13e20edd40c6f674859b83d49ca94b3cbb6f10e1b39ac7e5375a1. 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/BK4DA2326467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbda3bcd6e2336f711e219df81152cc9257fdbf0e2bce9bd9c3ec0807f13ccc46. 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/QZMER2206941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca4cdb9420c351f17ad9193a0a1d03f6c0e43969656c71e0d55210e5b42f2828. 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/QZMER2206942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0213f0837a2c5ca15c1fc97bc219b8db5e5593d93c6a2784f27c71afd87978d. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/QZMER2206943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca3bdc09cff214d3e131fad7a4edb322981a5ad13ce757bd256f35ea8b8725bc. 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/QZMER2206944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7405c83034c05cd691ce20fb45d7d6c249a9cd0bf0af527f5bfac9754056d88d. 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/QZMER2206945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6535f540fa70fe9c65594897a177dff1f40462b1a57aebb87c25a6e2d123083f. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZMER2206946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7954dd28571a306ffc1c2650bd8f7ea1a9e4b5692429b741750af53b61e1dfa. 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/QZMER2206947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ccd0f79d46185ac600a33723898db82bcdcf646c5876ee93df413cc6ff5976a. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZMER2206948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eb9411bcb73fdad17eed94d7d933a2e5e47b37c0ad96c1d54df33d7446c416f. 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/QZMER2206950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcadb6925365b2a6889bb31e26d73e12783c1e29647ed145281cd8318db5d0c5. 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/QZMER2206951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc8b2ba881e46bc1504dc38b63023ca3a1222b72c1f6cc7fb49a42f597c70c7. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZDA52200875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0e52debac4ea344eb4f1e0dc2828df352fbec2adb7199a639f1192546993158. 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/QZNJZ2201886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x021bfbd3df11d2d0582f3d2fa87400d85e318acbef5f4377b57a347f97b4cb28. 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/SE6TI2154580.