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 0xcbadcb75f5d5e0006efd46accd1181cd25d2ffb627d470c8249e95e3f08a9488. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3929255-f050-4efb-9405-a71a1accfda0.json and https://artists.proofprofile.net/proofs/artist/d3929255-f050-4efb-9405-a71a1accfda0.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 0x905fc191361332be909dcd5ec9a15cd167b4432eb83bb8fc1678ba8d4e203d5e. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/CH6542286077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x060dbc131f967386d61e6b5499d9863bb02fc64d68ec790921ff0bc5882e7d20. Chain 2 (Bitcoin): anchored in block 958579 (2026-07-18T16:26:17Z), 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/CH6542360638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd244ddbaf6e53305e7dc3a58528e3d1bb3f382bbaba4323a8767fcf23b2a5c4c. Chain 2 (Bitcoin): anchored in block 958798 (2026-07-20T00:05:41Z), 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/CH6542417256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccee9ad128acbc7ab0b6f4cd6badcc1ed6f5c3aabec19042d2ef2bddcc7ee439. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CH6542417257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00cca9b02e98acc229074a2e7b0f60608c5d0d279ac77356c74d7ed2c8f1d818. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/CH6542417258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905fc191361332be909dcd5ec9a15cd167b4432eb83bb8fc1678ba8d4e203d5e. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/CH6542286077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a9c6fa85925e78caacdfcf4631279001be159e58d63dc0b316aaf8603bb7e9a. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/CH6542417259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fa8e8b4ffd52b3770969bde9c79dffb35df43f3882004fa32459ba205b44152. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/CH6542279402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x469ffec05e569dd9627fb182a10ee775e6977a48028de4e3f4e436adb4b93dae. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/CH6541686167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd03bfbefac9ea54907378179a5ff34c18868f6672274c59c39e353bd974b1eb2. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CH6542417260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x060dbc131f967386d61e6b5499d9863bb02fc64d68ec790921ff0bc5882e7d20. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/CH6542360638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf7bf374f27b1706305e455b13873c1558c6bf52e55fabac57305d997c7740e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CH6542502194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd8d895dd22f3f5ddba56d3abef3921f3ee653e574f69ab2be81356c3a40418c. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/CH6542539462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8b2266d1f306c59939b4ae5cce41c41a7127050b26cd0b7ce546dae81629b4. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/CH6542557462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x829cbe8cc43523c059b2896e6cf1b815197497064a65ef349d64e99f8c42c03a. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/CH6542563547.