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 0x5596ef0f276e0652e24f91c002867f15ebbc637010ab4d04db682d360aac73f8. Chain 2 (Bitcoin): anchored in block 953588 (2026-06-14T04:52:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/012d076a-2948-42f0-ad4a-bc569b23bfe6.json and https://artists.proofprofile.net/proofs/artist/012d076a-2948-42f0-ad4a-bc569b23bfe6.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 0x5643a80df03e3895584e7dd14eb8875e1923751dd74902fb6afc006578a27dd5. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CAHQJ2565977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6905bdc6c99925fb7eb40bc33f736115768d67c8bc487a28dd4618e0be9dc41. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/CAHQJ2565978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d9283333d50726852a5e23afb5e81816456902ab701ec279e9adf52e1c4fc4. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CAHQJ2565979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd76f7862c0b70e29152f4824411add2f5d9c36f5177ddfc356ac02e7f11f305e. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/CAHQJ2565980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51c33ae727f57a3052b477fe0da77e55865cc65250231315407a2bb7dd621a89. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CAHQJ2565981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e8be2398657914f2dc4a9019b119efce6e8b706395c7145853e407d1de62912. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/CAHQJ2565982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4b2406b1530ac98f84ba71837e37c30ff9dfdc75ad4dc0bcd8060d0b7a65d5. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/CAHQJ2565983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0065aea00538f231ff38396ddfd65c4b9bc9be6dc38d2d25791a396147bf6fcc. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/CAHQJ2565984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc35a4de5f4e6140d0592ad9b334a717daeefe2dd857d63a8b3292eaa658908e8. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CAHQJ2565985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3634354b82ad6091464a85de11111aee33df9b817be6271f415fd065486be634. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/CAHQJ2565987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe71abe22a08dcf38cba21bc2b209e6c7a15bfa1f582bfd003227308f6bc932ca. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/CAHQJ2565988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d1eb88c81703b697b3743fa8458f75152ac684eabed8ec5ff6a98b6ae1d47e. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/CAHQJ2565989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8097a52567e5da185b829f4d5f1b42ce67e0c0104ae0a89b17185996f9d0401d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CAHQJ2565990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd806de5ca61e567fc3075d90fc59c27df576d31044aaa5e708b5e35fd970de4e. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/CAHQJ2565991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e6495a58d60a1cc872d8228157af7347561f73cde49c0b5e1b4e572822eb9b. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/CAHQJ2565992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd419b9d3baf8d0f046ea5fdef985ab3102145702c6a81dde4f83f62a4e5609d. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/CAHQJ2565994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce077db2f41727ffdf3402fb8e64b117f6ea15807e53f39bb9c760924fa81b5. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/CAHQJ2565995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66f71509b25c117171a10d4dbf0778900b210ec23cc5d7000790de76fdafbf38. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/CAHQJ2565996.