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 0x98a01f95a1619939ac1cd4505ae0cb7bb32f99598fb353336cdca9edc7174f6e. 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/7b8d3380-cb2b-4dfc-a5cc-0a1f985e25f0.json and https://artists.proofprofile.net/proofs/artist/7b8d3380-cb2b-4dfc-a5cc-0a1f985e25f0.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 0xd39304187b50437e0ed94e9a9a89843667851b8276ab56140defda22ea92f1a8. 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/NLAM42300301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b9647d590825871373b63673ae24852726535cf7773fc193aae7acc8a0edd05. 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/TCAIC2497160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd654fe86954c30b24e81b83481373c6106710b04c6b301bca82c32e066ba0cde. 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/NL5HJ2400043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cd52de223aa7a9ffb352c6bb3602f029ee6230a7f6ccd8278e9221669081299. 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/NL5HJ2300347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b50aae8824b01b9de1aeddedc7f4a89940c56252908ea491d84f93ee12b42fb. 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/NL5HJ2300343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36d56ffbe7f0a7111137d9114d7c16129e276918ae7c464b7f3089cfcb4030e8. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/NL5HJ2300287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6651cde7114391deb8f06889acd99b73d9a1e23a10e35c5ee2b7409e1101df6b. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QMDA62316373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c1956abc29390f29bafe613c4d2c2a391eab0e12e7c3dfcc906a768fdc8221d. 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/NLRD52222579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd18ca6ff496cf664d05d987cc5a074d0f14d68c6baa56ff75bc634cae7da722e. 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/NL5HJ2300179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f2463a5a13e1619c4f909a81f2cd2f7d2f830938222bf53918234ae11af064. 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/NL5HJ2300115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd2f396cd476b8d6d0254dd5f8fa48f170b739ff5518148b509a20e95404e287. 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/NL5HJ2300093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf718f81d5bc0e0f1e226a9c52fb56ceb6c6dc1cc01f8cfe0838e2796e294bbed. 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/NL5HJ2300045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86fa8ca6b3b224137013d6ec638c77ddcd1f9116c76bd99651041a8ad73c34fd. 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/NL5HJ2200425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e75e137fb5951a74053ab2a1fbd23bdb3c33486b8eacc90c4085f42fb6696b8. 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/NL5HJ2200138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67f7280bada3b94d11380978985118ff75fb89b249aa918326e313eb61fd5321. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/TCAFG2056638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x723a6bf311552038dfdd0b915e74c6d8f9e9d2a60a74def712aaa1d3b1651832. 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/TCAFB2029220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e0e2ca4a9dde6d646cea5c03fc3bdb3a5889307a2879533e81e3a2e8e5838df. 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/TCAEX2037313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd13ba2be3b115312037016b144bce53cebc9fe4e3fd32a50cea9bb9da79643d7. 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/TCAEM1941165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x486574495181f4bcd697e24f2646a10b898bd4bb9b2cf71a7780a96729379e25. 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/NL5HJ2200370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5202b4ec63c5053abe23fc3ecab8019e216b0cc8de289b2ce5dedd7b65b02d36. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NL5HJ2300223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407fd9cb763011ed318d30997674843b91ce6a4dfe7b3ab95f351714653f80a6. 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/NL5HJ2300224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb2dcab8142c5b16248f34a073569c8c58808eb015be03c17045e46ffa573dc0. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/TCAFL2151466.