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 0x409f2d265e2324788de6764d28899143fb0b8066063bc2d25872065722611f14. 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/60f1a11e-73ae-497b-8b18-ee616b74c123.json and https://artists.proofprofile.net/proofs/artist/60f1a11e-73ae-497b-8b18-ee616b74c123.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 0x2ea2292dcbd3f22388f413599e8f379e5ee17d63dff1057b3d63f0cd36b55ba5. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZ7R41750454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfae77297649bb61dce586f4bb28e321f2ca33f833c0e50a6a9ed92f63582762. 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/QZ7R41750459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11beee88559321995db6ff27c5b2977999f3486b9a0d64d6b6d3be9fb2d1c477. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZNJW2233189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a22cacf5ea0ac9b3e4a2b125e39c975cb14e95e6084f81145b237ce0e1d999. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZ7R42352051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcdad080481fe5a33f8bcbcd9c5f31fb7b6fe60dc249952dacd48e3f138c4e92. 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/QZGLS2103184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a159fe25a4eb2b7f2b9ed2a7950835761abb1ec8e6f8faf112f63e68e89a12c. 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/TCACK1525948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcdad080481fe5a33f8bcbcd9c5f31fb7b6fe60dc249952dacd48e3f138c4e92. 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/QZGLS2103184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9f46fab92e5b39eec64d22a3e6679361be885c786ddb7c39cf6d2f3f1233f9c. 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/QZ7R41850308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb897f79dd8fa4c01c197fc884f5e4b291c3547dd77d8d5ed2bc5c2986560b331. 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/QZ7R41850319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e9732116d3ed90cf9f9f16aa9b2755793ab202404ef7469f6020aa3a615893. 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/QZ7R41850320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c5db25a1a34ae06a5629708cb28c10212bc8572b9929f52cc850de4b7d5bcab. 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/QZ7R41850321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e791c46fa4ca3b04b54a772c8f22778990248284301c16709e38e5f4e7ab600. 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/QZ7R41850322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78fcb804be2b27b1f3b9f3697882cecd34acf9976bc26e51335f8c71798182f7. 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/QZ7R41850323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09dc08038dfd7e6af043d64052b980a555a6535be6a62fb5b2f9befa059c9850. 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/QZ7R41850324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d263c43f1b15944045b2a63d109aee7770e7edf8926a5065576305b86c423ad. 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/QZ7R41850325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92076b9d52f0ea0f97723fd3b6f6e1b4e1d08c45e7edc0edadc36d8781bb065. 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/QZ7R41850326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f64b87ed4d34e04ff530101ca43da9711abf2ea7ec0d88e37510be56f66bc4c. 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/QZ7R41850327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x958665f5d00f79f53d19c74b6355f4e2fc00a33263812b67b1fcf611aed4e1dc. 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/QZ7R41850328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc686323dfe46e65a28c96c18b0ec6abf6d49a43f4e60714fed56565fb84ca55. 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/QZ7R41850329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f4d18fb3e071cde35b8764b7975f43e347bbfb820e484e96a642a3cd7e51e8c. 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/QZ7R41850331.