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 0xfd4e81fee2826f0dfc93d4d55aef14d05b8ffaa7a919827e62d91d2483fad9b2. 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/90c7721c-591c-4068-9be2-5746464655c4.json and https://artists.proofprofile.net/proofs/artist/90c7721c-591c-4068-9be2-5746464655c4.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 0x8981e8217ce8e306c366eaae3b71df4742ebfc33aad2ba82c267995e3744fadf. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/FR8PF2300620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0528a8aa8209f84006ef6c9d468fb50abacb2093a66e2b116065ba5bc802a31. 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/FR8PF2300250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e257f65dedcfce0ecb5c0ddaf60b74756d609d7f9c9c7ae55192abef1bdc563. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T14:57:26Z), 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/DEVP22200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07465a42457122eb0957841f2435815e01b483ee5cb9e89cff75d4c98f651d34. 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/DEVP22200041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975be533cdbcba7112d74a752beeb39534b97484edbaa0286a3b477e972fb81d. 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/DEVP21900029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d720ad1d6302aaf7d0229e9d0c28958350b91e2beb5651cc74fbb4323c99741. 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/DEVP22200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0df22ddf4c1625f259ca53604926ede2504ca8bc954d9300565ae44b33c3e616. 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/DEVP22100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73274f1532366db68f76a8e30019116712d12be01a678231c747adc475c94060. 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/DEVP22200036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80e224723e176f85aad8ca0ee40420774e7dde97476a356d57cdaedecd9424ad. 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/CAEAZ1900088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa0cf29470576c913f77c301b73285d6f6d7c94f8aa681f483ecda111a9fed78. 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/FR8PF2400050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeae1aec92e0ca21a053198c08b5c28635dcb2951d6b7a83fc8fe138ffb648ca. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/DGA0P2306579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf034d27d39450b7aa855d069c8dc15acd80e9e2faf6d3c65d0b883cc75384463. 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/FR8PF2300260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c66c5094cadf6ec12083536df07895c7785dab5c34b1590b46067e7469d1df0. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:34:54Z), 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/USA2P2509060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x356bee22cd3eb2b8cbfe12f0f6964f6a3b687bb056602e7c0b5f45e54289bfbf. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USA2P2448850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38212d59f16730263815d879dbe82684fddfda50b0adeb34ba0f5ffc1501365. 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/USA2P2448851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e79fa50d00acc68784feb6cc38aa0f41e03428703447fbabd51f7ab0b88a365. 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/USA2P2448857.