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 0x512f63d78247393e6b5baff653943b212afa4a74edc2641c9d2381dc28979562. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fd790210-57c6-4ab4-9438-2ca6933006d9.json and https://artists.proofprofile.net/proofs/artist/fd790210-57c6-4ab4-9438-2ca6933006d9.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 0x8a8b9b11a3d11e464c13a6215240f78537fe9c77cf955e24c2f456d27f4737c1. 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/FRX202223958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd239b75293157f2a3d3c99183ae36e7ffaaf022e23c38595d1a9119f93908a6b. 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/DGA052369519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fc8fd2c25b75e96959a463a2e82ba5f7924aea712fc563964db9804355ee4da. 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/FR2X42372589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d26e73cbd742fa822f8f81082e0b1971f054d30ced7111a451cc52b3fe971e0. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/DGA052050348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e0cd7cb8a62efeabe88a55060f17633d77c27180f24c5abd747d63e6930ea4b. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DGA052369520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa928c1a85796a696aac5c2a50fed0423d428a72c86cece6bdc26a496f96622. 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/DGA052369522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71b518f26d1b8e436f7d22143ac25f96e0448aa47099ccc30a4a52cde191bcf8. 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/DGA052035366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69154d9e3de650d87991181b64e098b982b66041fc4ed1d38bd9b61d3236940. 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/DGA052035367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49336dde1f45928ea05021fee0d70eb4305a00afb22ce087724955eef92ed9f7. 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/DGA052035368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1304d85bec60e4b8cb48a7cc976a6ec9033e46cf20cacdc28442537772b1896. 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/DGA052035369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2785d926cda9df0c461d4ce9d975c5c1d0a9cde23e9ca405b2aba93a32d9b104. 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/DGA052035370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f1ded6ae86ea61b36e4f4b9b2fb9899df925b77940d24c3677edf25fd6e8a04. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DGA052035371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefec679ce10580476eabb3c7c373483d10bce670155fa83da5c658bb30ab2c1a. 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/DGA052035372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x751ffd678f5153025ad96a19cdb6579356bd15d3f9bc1ae9b4f95d99b433e425. 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/DGA052035375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fc8fd2c25b75e96959a463a2e82ba5f7924aea712fc563964db9804355ee4da. 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/FR2X42372589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8b9b11a3d11e464c13a6215240f78537fe9c77cf955e24c2f456d27f4737c1. 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/FRX202223958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc650a7605baf22865058c15df25ab3fadc34b336cf9e144eb23194b179fef265. 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/GBTYW0800067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeea8391379a81b1e6e93080e02b87f46fc48e333d2a787c96ffdcff5452d8826. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBTYW0800070.